Metal Roofing and Siding Installation Guide

Metal Roofing and Siding

Installation Guide

Installation details for Delta Rib

™

, Delta Rib

™

III,

Nor-Clad

, Strata Rib

& 2

⁄2" Corrugated.

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

March 2024 • ASC Building Products

www.ascbp.com

ASC Building Products

Metal Roofing Installation Guide • March 2024 1

Table of Contents

Section

Introduction..........................................2

Minimum Recommended Tools & Equipment ..........2-3

Delivery, Handling & Storage. . . . . . . . . . . . . . . . . .3

Safety Considerations .................................3

Roof Preparation .....................................4

Map of Typical Roof Conditions.........................5

Trim Locations........................................6

Fastener Placement ...................................6

Fastener Selection ....................................7

Panel Installation .....................................8

Hip/Ridge Flashing....................................9

Universal Ridge Termination ..........................10

Vented Ridge Flashing................................11

Vented Ridge Termination ............................12

Valley Flashing ......................................13

Valley Termination...................................14

Eave................................................15

Eave Flashing Preparation ............................16

Eave with Gutter .....................................17

Gable Flashing.......................................18

Gable/Ridge Transition...............................19

Gable Corner at Eave.................................19

Gable Flashing Preparation ...........................20

Gable Flashing Preparation at Ridge ...................21

Peak Flashing........................................22

Vented Peak Flashing.................................23

Sidewall Flashing ....................................24

Endwall Flashing.....................................25

Vented Endwall Flashing..............................26

Section

Slope Transition - High to Low Slope...................27

Slope Transition - Low to High Slope...................28

Chalet Gable Flashing ................................29

Adjustable Gable Flashing ............................30

Vent Flashing........................................31

Vent/Pipe Flashing Installation Procedure..............32

Skylight Flashing.....................................33

Skylight Flashing (Side)...............................33

Skylight Flashing (Uphill Side).........................34

Skylight Flashing (Downhill Side) ......................35

Procedure for the Installation of

Skylight Flashings ...............................36

Skylight Flashing Preparation ......................36-37

Chimney Flashing ....................................38

Chimney Flashing (Side) ..............................39

Chimney Flashing (Uphill Side) ........................40

Chimney Flashing (Downhill Side)......................41

Valley Top End.......................................42

Valley Dormer .......................................43

Panel End Lap .......................................44

Sealing End Laps & Lapping the Hems..................45

Window/Door Trim Corner Wall Detail..................46

Base Trim, Wall Step, Panel Top Wall Detail.............47

Inside Corner Wall Detail .............................48

Outside Corner Wall Detail............................49

Metal Roofing Installation Guide

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

2 March 2024 • ASC Building Products

www.ascbp.com

In addition to weather tightness, long life, good looks and

economy, ASC Building Product’s Metal Roofing is designed

with ease of installation as a primary consideration. This

guide is intended to help the installer achieve a high level

of quality in the finished product. Please do not hesitate

to contact an ASC Building Products representative for

assistance.

Important Notice

Be sure to read this manual in its entirety before beginning

installation.

This manual is provided to the customers of ASC Building

Products as a guide to assist in the installation of metal roofing.

Use for any other purpose is prohibited. This manual remains the

property of ASC Building Products.

These instructions contain suggested application procedures

only and cannot replace the need for good common sense

and experience. Responsibility for conformance to state and

local building codes, as well as any other ap pli ca ble project

requirements rests with the installer, as does the responsibility

to observe reasonable safety procedures.

ASC Building Products assumes no responsibility for any

problems which might arise as a result of improper installation

or any personal injury or property damage that may occur with

the product’s use.

Introduction

Screw Gun:

Clutch type screw gun with depth locating nose piece allowing

variable torque settings is recommended to insure proper

installation of the screws. The following sockets will be

required:

⁄4" and/or

⁄16" hex.

Snips:

For miscellaneous panel and lashing cutting requirements.

Three pairs of snips will be required for let edge, right edge,

and centerline cuts.

Electrical Metal Shears:

Used for general metal cutting, such as at the hips and valleys

Chalk Line:

Used to assist in the alignment of panels, lashings, etc

Neoprene Foam Tape:

⁄16" x

⁄4" roll of tape used for installation of inside and outside

profile closures and panel side laps.

Butyl Mastic Tape:

⁄16" x

⁄2" roll of tape used for prevention of water infiltration in

lashing to sheet metal applications.

Caulk:

Butyl or urethane sealant used to inhibit water infiltration.

Caulking Gun:

For miscellaneous caulking and sealing to inhibit water

infiltration.

Blind Rivet Hand Tool:

Used for miscellaneous lashing and trim applications.

Marking Tools:

Indelible markers, pencils, or scratching tools.

Minimum Recommended Tools

& Equipment

Note:

• It is recommended that metal roofing be applied on roofs with

a minimum slope of 3 inches per foot (3:12).

* The details contained in this guide are shown over a plywood

substrate. Details remain essentially the same for either a solid

substrate (plywood/OSB or steel decking), spaced framing or

intermittent support conditions with only the fastener type

changing. Where spaced framing is used, perimeter supports for

lashings must be considered.

** Each lashing part in this guide has been assigned a part num-

ber. Each part number contains one or two letters followed by

one or two numbers, for example: (EW17). These part numbers

have been provided for you to make ordering these lashing

parts quick and easy.

Note:

Some erectors prefer to use circular power saws with metal

cutting abrasive blades. While the use of power saws may

be faster, there are some disadvantages that must be

considered:

(1) The edges of metal that have been saw cut are

jagged and unsightly, and are more likely to rust than

sheared edges.

(2) Saw cutting will leave small particles of metal on the

panel surface that will rust and damage the panel

finish if not completely removed.

ASC Building Products

Metal Roofing Installation Guide • March 2024 3

Minimum Recommended Tools & Equipment (Con’t)

Scratch Awl:

Used to mark the steel.

Utility Knife:

Used for miscellaneous cutting.

Electric Drill:

Used to drill holes such as those required for rivet installation.

String Line:

Used for general alignment and measuring.

Tape Measure:

25 foot minimum (another 50 t. is handy).

Locking Pliers:

Standard and “Duckbill” style for miscellaneous clamping and

bending of parts.

Delivery, Handling and Storage

• Always check the shipment upon delivery. Check for damage

and check material quantities against the shipping list. Note

any damaged material or shortages at the time of delivery.

• Handle panel bundles and individual panels with care to avoid

damage. Longer bundles and panels may require two or more

“pick points” properly spaced to avoid damage that can result

from buckling and/or bending of the panels. Request a copy

of the Long Length Handling Instructions and diagrams from

ASC Building Products customer service as required.

• Improper storage of product can result in damage to the

finish known as Wet Stack Staining. Store the panels and

other materials in a dry, well ventilated area and away from

traffic. Elevate one end of the bundle to prevent moisture

from settling on the panels. Be sure that air will be able to

circulate freely around the bundles to avoid the build-up

of moisture. Cover the product with a tarp and allow for air

circulation around and under the tarp and bundle of material.

Minimize field storage of material. Contact with wet cement

should be avoided. Damage due to improper storage is not the

responsibility of ASC Building Products.

• Painted panels are shipped with a protective plastic sheeting

or a strippable film coating between all panels. Remove any

strippable film coating prior to installation and in any case, do

not allow the strippable film coating to remain on the panels

in extreme heat, cold, or in direct sunlight or other UV source.

• Wear clean cotton gloves when handling unpainted

ZINCALUME

-coated panels or lashings to avoid discoloration.

Rollforming die marks (which appear black), particularly at

bends, will be visible.

• Wear clean, non-marking, sot soled shoes when walking on

the panels to avoid shoe marks or damage to the finish. Do

not step on the panel seams or ribs. Step only in the lat area

of the panel.

Safety Considerations

• Never use unsecured or partially installed panels as a

working platform.

Do not walk on panels until they are in place on the roof

and all of the fasteners attaching the panels to the roof

have been installed.

• Metal roofing panels are slippery when wet, dusty, frosty

or oily.

Do not walk on a metal roof when any of these conditions

are present. Wearing sot soled shoes will help minimize

slipping and help prevent damage to the painted surfaces.

• Do not walk on the panel seams or major ribs.

When walking on the fully installed roof panels, be sure to

step only in the lat areas of the panels.

• Always be aware of your position on the roof relative to

your surroundings.

Take note of the locations of roof openings, roof edges,

equipment, co-workers, etc.

• Always wear proper clothing and safety attire.

Wear proper clothing when working with sheet metal in

order to minimize the potential for cuts, abrasions, and

other injuries. ASC Building Products recommends safety

glasses and gloves.

• Use care when operating electrical and other power

equipment.

Observe all manufacturer’s safety recommendations.

• Roof installation on windy or stormy days can be

dangerous.

Avoid working with sheet metal products on windy

or stormy days.

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

4 March 2024 • ASC Building Products

www.ascbp.com

Roof Preparation

ASC Building Products Metal Roofing can be used in both new

construction and retrofit roofing applications. We recommend the

installation of metal roofing over a continuous rigid substrate such

as plywood/OSB, or over spaced supports. Contact ASC Building

Products for additional information.

The following steps need to be taken to prepare the roof for

installation of metal roofing panels:

New Roofs:

1. Make sure there are no nails or other objects protruding from

the substrates that might puncture the underlayment or the roof

panels. Clean all debris from the roof.

2. Check all details for possible roof penetrations which must be

added to the deck prior to roof panel installation.

3. Cover the entire roof deck with a minimum of 30 lb asphalt-

saturated felt paper. Some synthetic underlayments may be used

in place of felt with ASC Building Products’ roofing. Installer must

ensure they meet the minimum standards of 30 lb felt and that

the underlayment manufacturer has approved them for use with

metal roofing. For applications over spaced framing other types

of moisture barriers may be required. For Class A fire resistance,

see notes below. For installation begin at the eave and roll the

underlayment horizontally (parallel to the eave). Allow each con-

sec u tive course to overlap the previous one 3 inches. Overlap the

ends a minimum of 6" (See illustration #1). Areas of underlayment

that have torn should be replaced or repaired prior to installation

of the metal roof.

Illustration No. 1

6" END LAP

3" SIDE LAP

30# FELT PAPER

UNDERLAYMENT

Constructions Requiring

Class ‘A’ Fire Resistance:

Panel: ASC Building Products’ steel roof panels.

Barrier Sheet (one of the following):

• GAF VersaShield

Underlayment

• Firestone GLAD-GARD™ SA-FR

• Polyglass Polystick

XFR

• Georgia-Pacific DensDeck

Rooboard

Additional Ply Sheet (optional): Any UL Classified Type G1, G2 or

G3 base/ply sheet, Type 15, 20 or 30 felt or UL Classified Prepared

Roofing Accessory (TGDY) or ASC Building Products’ “AEP Span

Underlayment HT”.

Substrate: 15⁄32” min. plywood or 7/16” min. OSB

Notes:

• Obey all local code requirements.

• Class A assembly requirements noted above per UL

listing TGFU.R21182. Refer to UL listing for specific

construction limitations.

4. Place an alignment line along the gable end where the first roof

panel will be installed. This line must be parallel to the gable

edge of the roof deck and square with the eave line. Check the

roof for squareness by making a 3' line across the eave. (See

illustration #2).

DIRECTION OF

PANEL APPLICATION

LINE MUST BE

SQARE WITH EAVE

1/4" IN FROM

THE GABLE

ALIGNMENT LINE

Illustration No. 2

Completing the 3' x 4' x 5' triangle should place the 4' edge of

the triangle parallel with the gable. The first roof panel will be

placed parallel with this line. Slight variations or out-of-square

conditions up to 3" can be covered by the gable trims shown on

page 18.

5. It is very important to measure the entire length of the roof from

gable to gable. Correct placement of the panels will allow the

panel’s ribs on each side to be covered by the gable lashing shown

on page 18. This will create a symmetrical appearance on both

gables. Should this be impractical, the adjustable gable detail on

page 30 can be used.

Note:

In areas where snow, ice, and heavy rain conditions exist, a high

temperature cold-applied rubberized underlayment , like AEP

Underlayment HT, should be used in lieu of felt in the valleys. Felt

on the remainder of the roof will lap over the membrane where

the two meet. See Valley page 13.

Existing Roofing:

Some jurisdictions will allow reroofing over existing roofing without

the need for tearoff. Check with your local codes or building

department for your specific requirements.

For best results, Roofing requires a relatively smooth and lat

substrate. Application over rough and/or uneven surfaces is not

recommended, for example, wood shingles. If the roof is to be

stripped down to the existing decking, follow the procedures for

new roofs on page 4. Be sure to check the existing roof and repair

any damaged areas prior to installation of the new roof system.

Note:

Do not apply metal roofing over roofs with structural

damage or trapped moisture.

ASC Building Products

Metal Roofing Installation Guide • March 2024 5

The following steps should be taken when installing ASC Building Products’ Metal Roofing over existing

roofing:

1. Inspect the roof for damage and make the necessary

repairs to achieve a lat plane for the metal roof panels.

Wood shingles should be removed.

2. Secure any warped or loose roofing.

3. Make sure that there are no nails or other objects

protruding from the roof that might puncture the new

underlayment or the new roof panels.

4. Remove all moss and other debris from the roof.

5. Cut off any overhanging roofing lush with the roof deck

and remove all hips, ridge caps, and penetration lashings.

6. Metal debris/shavings should be removed from the roof

progressively and daily to prevent immediate corrosion

and scratching of the top coat.

7. Follow the directions on page 4, #2 through #5 on roof

preparation.

Map of Typical Roof Conditions

For suggestions on how to trim lashings in the different areas, please refer to the following pages:

Flashing Page(s)

Adjustable Gable.................................. 30

Chalet Gable ......................................29

Chimney .......................................38-41

Eave...........................................15-16

Endwall........................................25-26

Gable ...................................10, 12, 18-21

Gutter ............................................17

Flashing Page(s)

Peak .............................................22

Pitch Transition.................................27-28

Ridge ...........................................9, 11

Sidewall Flashing ..................................24

Skylight........................................33-37

Valley....................................13-14, 42-43

Vent...........................................31-32

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

6 March 2024 • ASC Building Products

www.ascbp.com

Prevailing Weather Sheeting Direction

Neoprene or

Butyl Mastic (Typ)

Nor-Clad

(36" Coverage)

Strata Rib™ (36" Coverage)

Delta Rib III (36" Coverage)

Delta Rib (24" Coverage)

2-1/2" Corrugated (21-1/3" Coverage) Roof Applications

2-1/2" Corrugated (24" Coverage) Wall Applications

Lap Stitch Screw (Typ)

Woodscrew (Typ

)

Fastener Placement

Trim Locations

EAVE FLASHING

BOTTOM

CLOSURE

SINGLE TRACK

COVER

DOUBLE TRACK

COVER

MATCHING

FIBERGLASS

JAMB

TRIM

UNIVERSAL

ENDWALL

GABLE TRIM

UNIVERSAL

RIDGE

UNIVERSAL

SIDEWALL

TOP CLOSURE

PIPE FLASHING

BASE

TRIM

OUTSIDE

CORNER

C-METAL

INSIDE

CORNER

MAXIMUM RECOMMENDED

FASTENER ROW SPACING*

36" (See notes below)

Notes:

Lap panels away from prevailing weather. Use only those accessories specifically designed for use with this product. Use only galvanized or ZINCALUME

coated fasteners. Isolate roofing and lashings from contact with dissimilar metals. Fastener selection will vary based upon - see chart on following page. The

use of neoprene or butyl mastic tape along the sidelaps, as shown above, is always recommended for roofs. Lap stitch screws should be placed at 16" o.c.

maximum.

*The maximum recommended fastener row spacing is based on 2018 IBC/IRC 115 mph wind speed and an exposure rating of “B” (protected) for typical build-

ings. Refer to IAPMO-UES Building Code Compliance Report #ER-0550 for a more complete list of panel attachments and performance data. More efficient panel

attachment patterns may be available.

ASC Building Products

Metal Roofing Installation Guide • March 2024 7

No. 9 x 1", 1

⁄2", 2", 2

⁄2", 3" Wood Screw

⁄4" Hex

Head

Panel to dimensional lumber

Panel to plywood/OSB minimum

⁄16" thick.

Trim and side lap attachments.

Trim-to-trim or

trim-to-panel attachments.

Panel to purlin or deck attachments

No. 14 x 1", 1

⁄2" Wood Screw

⁄16" Hex Head

No. 12 x

⁄4" Stitch Screw

⁄4" Hex Head

(compatible with No. 9 Wood Screw)

No. 14 x

⁄8" Lap Self Driller

⁄16" Hex Head

(compatible with No. 14 Wood Screw)

Stainless Steel Rivet

⁄8" x

⁄8"

No. 12 x 1", 1

⁄2", 2", 2

⁄2" Self Driller

⁄16" Hex Head

Fastener # Description Use

Fastener Selection

Notes

• The table above shows the metal roofing panel fasteners provided by ASC Building Products.

Refer to the panel installation, lashing details, and fastener placement pages of this manual

for specific fastener usage. See page 6 for fastener spacing.

• Panel attachment screws must be long enough to penetrate through the roof decking at least

⁄8", or penetrate into solid lum ber at least one inch.

• All screws must be coated to provide protection against corrosion.

• Exposed fasteners should have sealing washers and be the same color as the parts they

attach.

• Roofing nails will also be required, but are not furnished by ASC Building Products. They are

typically used to temporarily hold a lashing in place that needs to be installed prior to the

panels.

• Screws must be properly driven to ensure proper seal and holding strength. Do not under

drive or overdrive the screws. Recommended drill speed is 2000 rpm. Use of a depth-sensing

nosepiece will aid in properly driving screws.

Proper Installation of

Gasketed Fasteners

Correctly

Driven

Under

Driven

Over

Driven

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

8 March 2024 • ASC Building Products

www.ascbp.com

ASC'S LIGHT

GAUGE ROOFING

Panel Installation

GENERAL

Study the details section of this manual prior to the

installation of the panels. Pay close attention to

the following:

• Flashings that need to be installed prior to the panels

include Valley, Eave, Vented Eave, Adjustable Gable and

Chalet Gable.

• Apply sealant or mastic tape to the pre-installed

lashings as shown in the detail section of this manual.

SEE PAGE 6 & 7 FOR

FASTENER PLACEMEN

AND SELECTION

1" OVERHANG

ILLUSTRATION #3

ILLUSTRATION #4

PROCEDURE

1. Install eave trim, valley trim and inside closure prior to

panel installation.

2. Align the edge of the first panel with the alignment line

constructed along the start gable. (See page 4 item 4

and illustration #3 below). Allow the panel to overhang

the eave 1" minimum.

3. Check the downhill end of the panel. If the panel length

is correct, the panel should overhang 1" past the eave

trim as shown below in illustration #4. Also, the panel

should not extend past the centerline of the ridge. (See

page 9)

4. Ater the first panel is properly aligned, fasten per the

fastener placement and spacing guidelines on page 6.

5. Lay down the second and third panels, checking

alignment, making sure they are square. This will ensure

that a sawtooth effect at the eave and ridge is avoided.

6. Metal debris/shavings should be removed from the roof

progressively and daily to prevent immediate corrosion

and scratching of the top coat.

ASC Building Products

Metal Roofing Installation Guide • March 2024 9

1 7/8"

3/4"

1/2"

3/8" HEM

2 1/8"

UNIVERSAL RIDGE (R1)

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

TOP POLYETHYLENE CLOSURE SET

IN SEALANT ALL AROUND

(SEE PROCEDURES)

ASC'S LIGHT

GAUGE ROOFING

3. #12 x 3/4" STITCH SCREW

4. #14 x 7/8" LAP SELF DRILLER

@ EACH RIB OR 8" O.C.

FOR 2-1/2" CORRUGATED

3-3/4"

3-1/2"

1/2"

135º TYP.

3/8" HEM

1 7/8"

3/4"

1/2"

3/8" HEM

2 1/8"

UNIVERSAL RIDGE (R1)

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

TOP POLYETHYLENE CLOSURE SET

IN SEALANT ALL AROUND

(SEE PROCEDURES)

ASC'S LIGHT

GAUGE ROOFING

3. #12 x 3/4" STITCH SCREW

4. #14 x 7/8" LAP SELF DRILLER

@ EACH RIB OR 8" O.C.

FOR 2-1/2" CORRUGATED

3-3/4"

3-1/2"

1/2"

135º TYP.

3/8" HEM

Hip/Ridge Flashing

Procedures

• Caulk the bottom and sides of the polyethylene closure.

Set the closure as shown above and caulk the top. The

closure is optional if the panel is turned up and caulked

at the sides near the rib.

• Fasten the ridge cap using stitch screw at each rib or 8"

o.c. for 2-1/2” Corrugated.

• Close the ends of the universal ridge cap by cutting and

folding material at each end. Fasten with rivets. (see

page 10)

• Caulk, lap and rivet sequential ridge lashings.

(see page 45)

Note: “R1” is a universal hip/ridge. A standard hip/ridge, “R3

& R4”, is also available.

Note: The gable lashing must be installed prior to

installation of the ridge (see page 18).

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

10 March 2024 • ASC Building Products

www.ascbp.com

Universal Ridge Termination

UNIVERSAL RIDGE (R1)

BUTYL MASTIC TAPE

OR NEOPRENE CLOSURE

TO CLOSE OFF THE RIDGE

3. STITCH SCREW 1/2"

FROM EDGE OF GABLE

GABLE

CAULK AND RIVET

SEE PAGE 21 FOR

GABLE PREPARATION

OVERHANG UP TO 4"

THEN FIELD TRIM TO 1" OVERHANG

ASC Building Products

Metal Roofing Installation Guide • March 2024 11

1 7/8"

6 3/4" 6 3/4"

3/8" HEM

1 7/8"

1 1/8"

3/8" HEM

SCREEN BY OTHERS

VENTED RIDGE (R2)

ASC'S LIGHT

GAUGE ROOFING

TOP CLOSURE

C-METAL (C1)

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

3. #12x3/4" STITCH SCREW

4. #14x7/8" LAP SELF DRILLER

@ EACH RIB OR 8" O.C.

FOR 2-1/2" CORRUGATED

AIR

FLOW

7/8"

2”

1”

3/8" HEM

Vented Ridge/Hip Flashing

Procedures

• Substrate should be held back 2" from each side of the

ridge.

• Attach the screen at each panel rib sandwiching the top

closure in place. Ensure screen is pulled tight to avoid

sagging.

• Fasten the vented ridge using stitch screw at each rib or 8"

o.c. for 2-1/2” Corrugated.

• Caulk, lap and rivet sequential lashings.

(see page 45).

• Close the ends of the ridge cap by cutting and folding

material at each end. Fasten with rivets and caulking

joints. (see page 12).

• Slopes greater than 6:12 may require special

ridge dimensions.

• For SFS VistaVent

or ProfileVent

alternate venting, use

lashing detail on page 9 and substitute clusure with vent

material.

R2 C1

Note: The gable lashing must be installed prior to

installation of the ridge (see page 18).

The screening shown creates a barrier for insects and birds

while allowing for ventilation.

For snow and heavy rain environments, please inquire

about other optional Vented Ridge details.

*Consult applicable building codes to ensure ridge vent screening meets minimum material requirements.

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

12 March 2024 • ASC Building Products

www.ascbp.com

Vented Ridge/Hip Termination

CUT AND TRIM SIMILAR

TO GABLE (SEE PAGE 21).

FOLD DOWN OVER END TABS.

CUT AT BENDS 1"

AND FOLD IN 90˚

VENTED RIDGE (R2)

CAULK

CAULK AND RIVET

GABLE

SEE GABLE PREPARATION

@ RIDGE (PAGE 21)

ASC Building Products

Metal Roofing Installation Guide • March 2024 13

Procedures

• Place a second layer of 36" roof underlayment in the

valley center line with 18" of roof underlayment on each

side.

• Starting at the low end, trim and place the valley lashing

so it overhangs the eaves 1". (see page 14)

• Caulk and lap the subsequent valley lashings a

minimum of 8".

• Typical polyethylene closures cannot be installed

diagonally across a miter cut panel. At mitre cuts, use

universal Emseal

closures parallel to the center of the

valley.

• Field cut the panels holding a minimum of 4" back from

the valley as shown. Larger valleys without the center

“V”, may be required in snow country installations.

• Install the panels over the valley lashing using #14

wood screws through the Emseal closure strip.

Space panel fasteners no further apart than as shown

on Page 8.

• When valleys are required, install sidelap neoprene or

butyl mastic tape along the sidelap a minimum of 10”

up from the panel edge.

13"

'W' VALLEY (V1)

ASC'S LIGHT

GAUGE ROOFING

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

INSTALL EMSEAL

CLOSURES

DIAGONALLY ACROSS THE BOTTOM

SIDE OF THE PANEL AND

SET IN SEALANT ALL AROUND

SEE NOTE

BELOW

1" TYP

IF PAINTED,

THIS SIDE

19-7/16"19-7/16"

Valley Flashing

Note: Refer to applicable building codes to ensure roof

valley construction meets code requirements. Certain

jurisdictions, like wildfire prone areas, may require

different construction methods or materials.

Note: In areas where snow, ice and heavy rain conditions

exist, panels may need to be held back more than 4" and

the valley lashing overall width must be increased. A high

temperature cold-applied rubberized underlayment should

be used extending at least 3' up from the center of the

valley on each side.

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

14 March 2024 • ASC Building Products

www.ascbp.com

MIN

VALLEY

FOLD TABS DOWN 90˚

REMOVE THIS MATERIAL

SEE VALLEY (PAGE 13) FOR

FASTENING & SEALING REQUIREMENTS

EAVE

EMSEAL

CLOSURE

FILL END

WITH SEALANT

Valley Termination

ASC Building Products

Metal Roofing Installation Guide • March 2024 15

ASC'S LIGHT

GAUGE ROOFING

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

O.H.

EAVE (E1)

BOTTOM POLYETHYLENE

CLOSURE SET IN

SEALANT ALL AROUND

ROOFING NAILS

OR TRIM SCREWS

1/2"

1 3/8"

1/2"

3/8" HEM

3-3/8"

4-3/8"

3/8" HEM

1/2"

4 3/8"

1 1/2"

1/2"

Procedures

• Attach the eave lashing using roofing nails or trim

screws evenly spaced to temporarily secure lashing

prior to installing panels.

• Caulk and lap the lashing a minimum of 3".

(see page 45)

• Panels should overhang the eave 1" minimum.

Eave and Vented Eave Flashings

This lashing must be installed prior to the panels.

ER1

ER2

E2E1 E4 E5E3

Vented Eave

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

16 March 2024 • ASC Building Products

www.ascbp.com

REMOVE THIS MATERIA

EAVE

REMOVE THIS MATERIAL

EAVE

BEND TABS

HERE @ 90˚

Eave Flashing Preparation

Use this lashing where eave meets gable

STEP 1

STEP 2

Note: Length of eave must allow 1" to

extend past gable fascia.

ASC Building Products

Metal Roofing Installation Guide • March 2024 17

Eave With Gutter

Note: This lashing must be installed prior to the panels.

Procedures

• Underlayment should be installed over top of eave (E3)

lashing (underlayment not shown).

• Temporarily attach eave lashing using roofing nails or trim

screws to secure lashing prior to installing panels.

• Caulk and lap the lashing a minimum of 3".

(see page 45)

• Panels should overhang the eave a minimum of 1".

• ASC Building Products recommends that a licensed gutter

contractor install gutters.

1 3/8"

1/2"

ROOFING NAILS

OR TRIM SCREWS

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

O.H.

BOTTOM POLYETHYLENE

CLOSURE SET IN SEALANT ALL AROUND

GUTTER

ATTACH PER

MANUFACTURER'S

RECOMMENDATIONS

EAVE (E3)

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

18 March 2024 • ASC Building Products

www.ascbp.com

5/8"

3/8" HEM

5/8"

3/8" HEM

1 1/8"

1/2"

2 3/4"

1/2"

1 1/4"

BUTYL MASTIC TAPE

2. #14 WOOD SCREW

@ 24" O.C.

ASC'S LIGHT

GAUGE ROOFING

3. #12 x 3/4" STITCH SCREW

4. #14 x 7/8" LAP SELF DRILLER

@ 24" O.C.

GABLE (G2)

2. #14 x 1" METAL WOOD

@ 24" O.C.

1-1/8"

3/8" HEM

5/8"

3/8" HEM

1/2"

Gable Flashing

5/8"

3/8" HEM

5/8"

3/8" HEM

1 1/8"

1/2"

3/8"

2 3/4"

1/2"

1 1/4"

BUTYL MASTIC TAPE

2. #14 WOOD SCREW

@ 24" O.C.

ASC'S LIGHT

GAUGE ROOFING

GABLE (G4)

2. #14 WOOD SCREW

@ 24" O.C.

Procedures

• Place the first roof panel according to the instructions

on pages 4 and 8.

• Place butyl mastic tape along lange of gable trim as

shown.

• Install the gable lashing by placing it firmly over the

panel. Use color matched wood screws at 24" o.c. to

attach gable trim to the panel and substrate.

• Caulk and lap the lashing a minimum of 3".

(see page 45)

• Mitre cut the lashing at the peak to join each side at the

ridge. (see page 21)

• Snip and fold the gable at the eave to close the end.

Use rivets to fasten.

Notes: “G1” is a standard gable. Narrower gables, “G3”

and “G4”, are also available.

ASC Building Products

Metal Roofing Installation Guide • March 2024 19

Gable/Ridge Transition

(similar to Endwall)

ASC'S LIGHT

GAUGE ROOFING

GABLE OR SIDEWALL

BUTYL MASTIC TAPE

WITH FASTENERS

RIDGE OR ENDWALL

GABLE

BEND HERE 90˚

RIVET

INSERT EAVE TAB

BEHIND GABLE

EAVE

ASC'S LIGHT

GAUGE ROOFING

GABLE OR SIDEWALL

BUTYL MASTIC TAPE

WITH FASTENERS

RIDGE OR ENDWALL

GABLE

BEND HERE 90˚

RIVET

INSERT EAVE TAB

BEHIND GABLE

EAVE

Gable Corner at Eave

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

20 March 2024 • ASC Building Products

www.ascbp.com

Gable Flashing Preparation

STEP 1

STEP 2

STEP 3

GABLE

REMOVE THIS MATERIA

* SEE TABLE

FOR DIMENSION

GABLE

SNIP HERE

REMOVE THIS MATERIAL

2 1/2"

1 1/2"

SNIP HERE

GABLE

FOLD 90˚

REMOVE THIS MATERIAL

GABLE

REMOVE THIS MATERIA

* SEE TABLE

FOR DIMENSION

GABLE

SNIP HERE

REMOVE THIS MATERIAL

2 1/2"

1 1/2"

SNIP HERE

GABLE

FOLD 90˚

REMOVE THIS MATERIAL

Roof Pitch Dimension

3:12 2"

4:12 1

⁄8"

5:12 1

⁄16"

6:12 1

⁄16"

12:12

⁄8"

Note: Length of uncut

gable must extend 2

⁄2"

past eave fascia.

ASC Building Products

Metal Roofing Installation Guide • March 2024 21

EQUAL

VERTICAL CUT

* SEE TABLE

REMOVE THIS

MATERIAL WITH SNIPS

OR POWER SHEARS

REMOVE THIS

MATERIAL WITH SNIPS

OR POWER SHEARS

RIDGE LINE

14" FOR STANDARD RIDGE

17" FOR VENTED RIDGE

RIDGE LINE

GABLE

RIVET

GABLE

REMOVE THIS

MATERIAL WITH SNIPS

OR POWER SHEARS

EQUAL

VERTICAL CUT

* SEE TABLE

REMOVE THIS

MATERIAL WITH SNIPS

OR POWER SHEARS

REMOVE THIS

MATERIAL WITH SNIPS

OR POWER SHEARS

RIDGE LINE

14" FOR STANDARD RIDGE

17" FOR VENTED RIDGE

RIDGE LINE

GABLE

RIVET

GABLE

REMOVE THIS

MATERIAL WITH SNIPS

OR POWER SHEARS

Gable Flashing Preparation at Ridge

STEP 1 STEP 2

STEP 3 STEP 4

Roof Pitch Dimension*

3:12 1

⁄16"

3.5:12 1

⁄4"

4:12 1

⁄16"

5:12 1

⁄4"

6:12 2

⁄16"

12:12 4

⁄16"

* Dimensions only apply to

G4 Gable Flashing

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

22 March 2024 • ASC Building Products

www.ascbp.com

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ASC LIGHT GAUGE ROOFING

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

Peak Flashing

Procedures

• Fasten roofing panel to substrate at peak.

• Caulk the bottom and sides of top-side closure and place

near peak. Locate closures where they will be hidden

underneath peak lashing.

• Apply caulk along top of closure, and fasten peak lashing

using stitch screws at every panel rib location.

• Caulk, lap, and rivet sequential lashings (see pg. 45).

• Close the ends of the peak at gable ends by slitting and

folding material at each end, caulking joints, and fastening

with rivets.

Notes:

1. Peak lashing dimensions noted on this installation detail

based on nominal 1” thick wall facing. Different wall panel

thicknesses may require some adjustments to peak

lashing dimensions and/or positioning of roof assembly

components.

2. Additional blocking may be required at peak to support

peak lashing.

PF2 Roof Pitch Dimension Dimension

3:12-5:12 5-3/8" 5-1/4"

6:12-8:12 6" 5-3/4"

9:12-10:12 6-1/2" 6-1/4"

11:12-12:12 7-1/8" 6-5/8"

PF2

ASC Building Products

Metal Roofing Installation Guide • March 2024 23

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

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Vented Peak Flashing

Procedures

• Substrate should be held back 2” from the peak.

• Locate the panels at the top end of the substrate. Install

C-metal onto end of panel and fasten panel and C-metal

into place. Check panel positioning at eave before

fastening.

• Insert top-side closure onto panel, at C-metal location.

• Attach the screen at each panel rib, sandwiching the

topside closure in place. Ensure screen is pulled tight to

avoid sagging.

• Fasten the vented peak lashing using stitch screws at

panel rib locations.

• Caulk, lap and rivet sequential lashings (see page 45).

• Close the ends of the peak at gable ends by cutting and

folding material at each end. Fasten with rivets and

caulking joints. (see page 12).

Notes:

1. Peak lashing dimensions noted on this installation detail

are based on nominal 1” thick wall facing. Different wall

panel thicknesses may require some adjustments to peak

lashing dimensions and/or positioning of roof assembly

components.

2. Additional blocking may be required at peak to support

peak lashing.

PF2 Roof Pitch Dimension Dimension

3:12-5:12 6-3/4" 7”

6:12-8:12 7-1/2”" 7-7/8”

9:12-10:12 8-1/4”" 8-5/8"

11:12-12:12 9" 9-1/4"

PF3

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

24 March 2024 • ASC Building Products

www.ascbp.com

1 1/8"

1/2"

3/4"

ASC'S LIGHT

GAUGE WALL PANEL

ROOFING NAILS

OR TRIM SCREWS*

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

BOTTOM POLYETHYLENE CLOSURE

SET IN SEALANT ALL AROUND

UNIVERSAL SIDEWALL (SW1)

BUTYL MASTIC TAPE

ASC'S LIGHT

GAUGE ROOFING

2. #14 WOOD SCREW

@ 24" O.C.

1-1/8"

3/8" HEM

5/8"

Sidewall Flashing

This lashing must be installed prior to wall panels.

SW1 SW2

Procedures

• The roof should be installed prior to the siding.

• Place butyl mastic tape along the top of the panel

as shown.

• Install the side wall lashing by placing it firmly on the

roofing panel and fastening with the fastener indicated.

• Caulk and lap the lashing a minimum of 3". (see page

45)

* To temporarily secure lashing prior to installing panels.

ASC Building Products

Metal Roofing Installation Guide • March 2024 25

1/2"

1 1/8"

3/4"

1/2"

ROOFING NAILS

OR TRIM SCREWS

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

ASC'S LIGHT

GAUGE WALL PANEL

BOTTOM POLYETHYLENE CLOSURE

SET IN SEALANT ALL AROUND

#12 x 3/4" STITCH SCREW

#14 x 7/8" LAP SELF DRILLER

@ EACH RIB OR 8" O.C.

FOR 2-1/2" CORRUGATED

UNIVERSAL ENDWALL (EW1)

ASC'S LIGHT

GAUGE ROOFING

TOP POLYETHYLENE CLOSURE

SET IN SEALANT ALL AROUND

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

3/8" HEM

EW1

EW2

Procedures

• Install sealant on the bottom and top of the

polyethylene closure. Set the closure as shown above.

• Fasten the end wall lashing to the wall with roofing

nails or trim screws to temporarily secure lashing prior

to installing panels.

• Caulk and lap the lashing a minimum of 3". (see page

45)

Endwall Flashing

This lashing must be installed prior to wall panels.

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

26 March 2024 • ASC Building Products

www.ascbp.com

Vented End Wall Flashing

This lashing must be installed prior to wall panels.

Procedures

• Substrate should be held back 2" from the wall.

• Install sealant on the bottom and top of the polyethylene

closure. Set the closure as shown above.

• Fasten the end wall lashing to the wall with roofing nails

at 24" or trim screws to temporarily secure lashing prior to

installing panels.

• Fasten the lashing to each rib with #12 x 3⁄4" stitch screws.

Place a short bead of sealant on top of each rib as shown.

(8” spacing for 2-1/2” Corrugated)

• Caulk and lap the lashing a minimum of 3". (see page 45)

• For SFS VistaVent

or ProfileVent

alternate venting, use

(EW1) for vented endwall lashing detail.

6 3/4"

1 7/8"

3/8" HEM

1 1/8"

ASC'S LIGHT

GAUGE WALL PANEL

BOTTOM POLYETHYLENE CLOSURE

SET IN SEALANT ALL AROUND

VENTED ENDWALL (EW17)

SEALANT AT FASTENER LOCATIONS

ASC'S LIGHT

GAUGE ROOFING

3. #12 x 3/4" STITCH SCREW

4. #14 x 7/8" LAP SELF DRILLER

@ EACH RIB OR 8" O.C.

FOR 2-1/2" CORRUGATED

AIR FLOW

SCREEN BY OTHERS

TOP POLYETHYLENE CLOSURE

SET IN SEALANT ALL AROUND

ROOFING NAILS

OR TRIM SCREWS

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

OPTIONAL FIBER FILL

FOR SNOW COUNTRY

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

EW17

ASC Building Products

Metal Roofing Installation Guide • March 2024 27

ROOFING NAILS

OR TRIM SCREWS

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

BOTTOM POLYETHYLENE CLOSURE

SET IN SEALANT ALL AROUND

PITCH BREAK (PB3)

3. #12 x 3/4" STITCH SCREW

4. #14 x 7/8" LAP SELF DRILLER

@ EACH RIB OR EVERY THIRD

RIB FOR 2-1/2" CORRUGATED

ASC'S LIGHT

GAUGE ROOFING

TOP POLYETHYLENE CLOSURE

SET IN SEALANT ALL AROUND

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

WOOD BLOCKING

3/8" HEM

SLOPE (S1)

SLOPE (S2)

SPECIFY

ANGLE

Slope Transition - High Slope to Low Slope

This lashing must be installed prior to uphill panels.

Procedures

• Install sealant on the bottom and top of the

polyethylene closure. Set the closure as shown above.

• Fasten the transition lashing to the substrate with

roofing nails or trim screws to temporarily secure

lashing prior to installing panels.

• Caulk and lap the lashing a minimum of 3".

(see page 45)

• Attach the uphill panels as shown.

• Install wood blocking as needed for support.

• Place a small length of sealant on the top of each rib as

shown.

PB3

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

28 March 2024 • ASC Building Products

www.ascbp.com

ASC'S LIGHT

GAUGE ROOFING

ROOFING NAILS

OR TRIM

SCREWS.

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

PITCH BREAK (PB4)

BOTTOM POLYETHYLENE CLOSURE

SET IN SEALANT ALL AROUND

TOP POLYETHYLENE CLOSURE

SET IN SEALANT ALL AROUND

WOOD BLOCKING

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

3. #12 x 3/4" STITCH SCREW

4. #14 x 7/8" LAP SELF DRILLER

@ EACH RIB OR EVERY THIRD

RIB FOR 2-1/2" CORRUGATED

SLOPE (S1)

SLOPE (S2)

3/8" HEM

SPECIFY ANGLE

Slope Transition - Low Slope to High Slope

This lashing must be installed prior to uphill panels.

Procedures

• Install sealant on the bottom and top of the polyethylene

closure. Set the closure as shown above.

• Fasten the transition lashing to the substrate with roofing

nails or trim screws prior to installing the uphill panels.

• Caulk and lap the lashing a minimum of 3".

(see page 45)

• Attach the uphill panels with a 1" overhang.

• Install wood blocking as needed for support.

• Place a small length of sealant on the top of each rib as

shown.

PB4

ASC Building Products

Metal Roofing Installation Guide • March 2024 29

Chalet Gable Flashing

This lashing must be installed prior to panels.

Procedures

• Attach the chalet lashing using color matched wood screws

spaced at 24" o.c.

• Polyethylene closures cannot be installed diagonally across

angle cut panel ends. Use Emseal® closures parallel to cut

edge to seal voids under panel ends.

• Field cut the panels holding 5" back from the face of the

lashing as shown.

• Attach the panels to the roof along the bottom edge using

#14 wood screws evenly spaced at 4" o.c. and approximately

2” from panel ends at closure location.

• Chalet gable to be used with standard eave “E1”.

(see page 15)

G18

3/8" HEM

3 7/8"

5/8"

3/4"

1 5/8"

EMSEAL

CLOSURE

SET IN SEALANT

ALL AROUND

ASC'S LIGHT

GAUGE ROOFING

SLOPE

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

* THIS DETAIL IS ALSO KNOWN AS

A "PROW" OR "DUTCH" GABLE ROOF.

CHALET GABLE (G18)

2. #14 WOOD SCREW

@ 24" O.C.

End of mitre-cut panel

(See Roof Map page 5)

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

30 March 2024 • ASC Building Products

www.ascbp.com

3/8" HOOK

1/2"

1" HOOK

2 1/2"

ASC'S LIGHT

GAUGE ROOFING

ADJUSTMENT AREA

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

ROOFING NAILS

@ 12" O.C.

STARTER STRIP (SS1)

CAULK OR BUTYL MASTIC TAPE

CAULK HEM

2. #14 WOOD SCREW

@ 24" O.C.

ADJUSTABLE GABLE (G5)

Adjustable Gable Flashing

SS1

Procedures

• In many instances, the roof sheet will have to be field

modified (major rib removed along the gable). See roof map

on page 5 and locate “adjustable gable". If gable trims are

used in this location, and as the roof drains from the ridge,

water will low inside the gable trims shown on page 18. The

adjustable gable trim pieces shown above can assist in a

proper roof in stal la tion.

• When a major rib on a metal roofing panel occurs over the

roof area within 3" of the edge of the gable, cut the panel

and remove the major rib from the end of the sheet from

the low eave to allow for the placement of the starter strip.

• Install the gable trim, extending the horizontal leg 6" uphill

and underneath the eave on the portion of the roof sheet at

the gable/eave intersection.

• Locate the placement of the starter strip to insure that the

cut edge of the roof sheet can be inserted into the 1" leg of

the starter strip.

• Field caulk inside the open hem and the under side of the

starter strip per the detail on this page and install parallel

to gable.

Note: Locate starter strip to allow proper installation of

adjustable gable trim as shown.

ASC Building Products

Metal Roofing Installation Guide • March 2024 31

Vent Flashing

Procedures

• Trim the opening in the lashing to 20% smaller than

the pipe diameter.

• Slide the lashing down over the pipe.

• Seal between the vent lashing and the roofing with

gunnable caulk and set the lashing.

• Form the lashing to fit the profile of the roof.

• Fasten the lashing with fasteners at 1" o.c. Refer to the

fastener selection guide on page 7.

• Penetrations occurring over spaced supports may

require additional support framing.

• A stainless steel draw band should be installed at the

top of the vent/pipe lashing.

• A minimum drainage area of 2" should be maintained

between both sides of the lexible vent/pipe lashing

base and the roof panels’ major ribs.

• When a penetration occurs through a panel sidelap,

gunnable caulk needs to be installed in the capillary

groove from the penetration to the ridge. This will

prevent water from running downhill in the capillary

groove and into the roof opening. Refer to illustration

#5, above.

VENT / PIPE FLASHING

FASTEN @ 1" O.C.

ROOF PANEL

GUNNABLE CAULK IN CAPILLARY GROOVE FROM

RIDGE/HIP TO UPHILL SIDE OF PENETRATION

SEE PROCEDURES BELOW

ILLUSTRATION #5

Note: For the best drainage when a square-based pipe

lashing is used, one corner of the lexible pipe lashing

should be oriented to the high-side of the roof.

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

32 March 2024 • ASC Building Products

www.ascbp.com

Vent/Pipe Flashing Installation Procedure

STEP 1: Cut

Cut to pipe diameter marked on

Flashers (this is approximately 20%

smaller than the diameter of the

pipe).

STEP 2: Slide

Slide the Flashers down the

pipe, using water to lubricate if

necessary.

STEP 4: Seal

Seal the Flashers by applying

urethane/silicone sealant between the

Flasher and the roof. Use a large slot

screwdriver to press the base down

tightly.

STEP 5: Fasten

Fasten the Flashers with weather-

resistant fasteners to complete the seal.

STEP 3: Form

Form and bend the aluminum base of

the Flashers to fit the surface of the

roof.

Note: For the best drainage when a square-based pipe

lashing is used, one corner of the lexible pipe lashing

should be oriented to the high-side of the roof.

ASC Building Products

Metal Roofing Installation Guide • March 2024 33

DOWNHILL

SEE PAGE 35

UPHILL

SEE PAGE 34

SIDE

SEE BELOW

SLOPE

LENGTH

WIDTH

3 1/2"

3/8" HEM

DOWNHILL

SEE PAGE 37

WIDTH

LENGTH

SLOPE

SIDE

SEE BELOW

UPHILL

SEE PAGE 36

SIDE SKYLIGHT (SK18)

2. #14 WOOD SCREW

@ 4" O.C.

BUTYL MASTIC TAPE

ASC'S LIGHT

GAUGE ROOFING

Skylight Flashing

• Wherever possible, position the skylight curb so the ribs of the

roof panels do not interfere with the lashing.

• Cut the metal roof panels as close to the let, right and downhill

sides of the curb as possible. Cut the uphill side 6" up from the

curb as indicated above.

• Penetrations occurring over spaced supports require

additional support framing.

SK18

(Side)

1 – Skylight Flashing (Side)

Note: Do not fasten the pan-

els within 24" uphill from the

skylight until the penetration

lashing is installed.

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

34 March 2024 • ASC Building Products

www.ascbp.com

6" MIN

2 1/2"

3 1/2"

12"

BOTTOM POLYETHYLENE CLOSURE

SET IN SEALANT ALL AROUND

ASC'S LIGHT

GAUGE ROOFING

2. #14 WOOD SCREW

@ EACH SIDE OF EACH RIB

OR 8" O.C. FOR 2-1/2" CORRUGATED

UPHILL SKYLIGHT (SK16)

SK16

(Uphill)

2 – Skylight Flashing (Uphill Side)

ASC Building Products

Metal Roofing Installation Guide • March 2024 35

2 1/2"

3/8" HEM

3. #12 x 3/4" STITCH SCREW

@ EACH RIB OR 8" O.C.

FOR 2-1/2" CORRUGATED

TOP POLYETHYLENE CLOSURE

SET IN SEALANT ALL AROUND

DOWNHILL SKYLIGHT (SK17)

ASC'S LIGHT

GAUGE ROOFING

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

SK17

(Downhill)

3 – Skylight Flashing (Downhill Side)

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

36 March 2024 • ASC Building Products

www.ascbp.com

2 1/16"

2 1/2"

SKYLIGHT

ASC'S LIGHT

GAUGE ROOFING

SLOPE

LENGTH

SLOPE

FOLD HERE 90˚

CUT HERE

REMOVE THIS MATERIAL

CUT HERE

Procedure for the Installation of Skylight Flashings

DOWNHILL SIDE

ILLUSTRATION #6

Skylight Flashing Preparation

RIGHT SIDE FLASHING SHOWN, LEFT

SIDE SIMILAR (MIRRORED)

UPHILL SIDE

The skylight lashing will be 4" wider than

the width of the curb (2" on each side). Cut a

⁄8" slot in the two uphill corners of the metal

roofing panel slightly wider than 2", so the

uphill lashing can slide through the two

slots. (See illustration #6).

Adjustments to the horizontal leg dimension

and length of slit may have to be modified

depending on the location of the panels’

major rib.

REFER TO

INSTALLATION VIDEO

FOR CLARIFICATION

ASC Building Products

Metal Roofing Installation Guide • March 2024 37

FOLD HERE 90˚

CUT HERE

REMOVE THIS MATERIAL

CUT HERE

FOLD HERE 90˚

REMOVE THIS MATERIAL

CUT HERE

REMOVE HEM

TO FOLD LINE

Skylight Flashing Preparation (continued)

Procedures

• Trim both ends of the uphill and downhill sides of the

skylight lashing as indicated.

• Slide the uphill lashing into the slots of the metal roofing

and apply liberal amount of gunnable caulking.

• Assemble the skylight as indicated on pages 34-37.

• Trim and assemble chimney lashing similarly.

DOWNHILL FLASHING

UPHILL FLASHING

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

38 March 2024 • ASC Building Products

www.ascbp.com

Chimney Flashing

UPHILL

SEE PAGE 40

DOWNHILL

SEE PAGE 41

SIDE

SEE PAGE 39

LENGTH

WIDTH

SLOPE

Note: Procedures for the installation of chimney lashings

are similar to the skylights. (see pgs. 34-37). The reglet**

shown may be deleted if the chimney is clad with siding.

(Lap the siding over the lashing and caulk). Be sure to

specify the slope and the orientation of the chimney

dimensions when ordering this assembly.

** A reglet is a two-piece lashing found on the side of a

wall, chimney or other similar roof penetration.

(see lashing drawing page 40).

ASC Building Products

Metal Roofing Installation Guide • March 2024 39

3/8" HEM

1/2"

3/8" HEM

3/4"

3/8" HEM

GUNNABLE CAULK

ANCHOR BY OTHERS

REGLET (RG16)

GUNNABLE CAULK

SIDE CHIMNEY (CH18)

BUTYL MASTIC TAPE

ASC'S LIGHT

GAUGE ROOFING

2. #14 WOOD SCREW

@ 4" O.C.

CH18

(Side)

RG16

(Reglet)

1 – Chimney Flashing (Side)

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

40 March 2024 • ASC Building Products

www.ascbp.com

6" MIN

2 1/2"

12"

3/8" HEM

1/2"

3/8" HEM

3/4"

GUNNABLE CAULK

ANCHORS BY OTHERS

REGLET (RG16)

GUNNABLE CAULK

UPHILL

CHIMNEY

(CH16)

BOTTOM POLYETHYLENE CLOSURE

SET IN SEALANT ALL AROUND

ASC'S LIGHT

GAUGE ROOFING

#14 WOOD SCREW

@ EACH SIDE OF EACH RIB

OR EVERY OTHER RIB

FOR 2-1/2" CORRUGATED.

CH16

(Side)

RG16

(Reglet)

2 – Chimney Flashing (Uphill)

ASC Building Products

Metal Roofing Installation Guide • March 2024 41

3/8" HEM

1/2"

3/4"

3/8" HEM

GUNNABLE CAULK

ANCHORS BY OTHERS

REGLET (RG16)

GUNNABLE CAULK

TOP POLYETHYLENE CLOSURE

SET IN SEALANT ALL AROUND

DOWNHILL CHIMNEY (CH17)

ASC'S LIGHT

GAUGE ROOFING

3. #12 x 3/4" STITCH SCREW

@ EACH RIB OR 8" O.C.

FOR 2-1/2 CORRUGATED

2. #14 WOOD SCREW

SEE ILLUSTRATION

PAGE 7

CH17

(Downhill)

RG16

(Reglet)

3 – Chimney Flashing (Downhill)

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

42 March 2024 • ASC Building Products

www.ascbp.com

Valley Top End

FIELD MITER AND ASSEMBLE

USE EMSEAL

CLOSURE

TO CLOSE OFF VALLEY FLASHING

ASC'S LIGHT

GAUGE ROOFING

ROOFING NAIL

VALLEY (V1)

INSTALL EMSEAL

CLOSURES

DIAGONALLY ACROSS THE BOTTOM

SIDE OF THE PANEL AND

SET IN SEALANT ALL AROUND

Note: Refer to Ridge and Valley installation details within

this guide for further clarification on those areas.

ASC Building Products

Metal Roofing Installation Guide • March 2024 43

Valley Dormer

FIELD MITER AND ASSEMBLE

ONTO FLAT STOCK

USE EMSEAL

CLOSURE

TO CLOSE OFF

VALLEY FLASHING

ASC'S LIGHT

GAUGE ROOFING

ROOFING NAIL

VALLEY (V1)

INSTALL EMSEAL

CLOSURES

DIAGONALLY ACROSS THE BOTTOM

SIDE OF THE PANEL AND

SET IN SEALANT ALL AROUND

Note: Refer to Ridge and Valley installation details within

this guide for further clarification on those areas.

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

44 March 2024 • ASC Building Products

www.ascbp.com

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 9

BUTYL MASTIC TAPE OR

GUNNABLE SEALANT

6" MIN

SLOPE

6" MIN

SLOPE

BUTYL MASTIC TAPE OR

GUNNABLE SEALANT BETWEEN PANELS

ASC'S LIGHT

GAUGE ROOFING

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

Panel End Lap

Long Panel End Lap

For panels 28 t. or longer

6" Min

#10 PANCAKE HEAD

2 ROWS

BUTYL MASTIC TAPE OR

GUNNABLE SEALANT BETWEEN PANELS

ASC'S LIGHT

GAUGE ROOFING

SLOPE

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

Note: Use this detail so that panels can expand and con-

tract independently.

ASC Building Products

Metal Roofing Installation Guide • March 2024 45

1/8"

SNIP HERE

OPEN THE HEM OF BOTH

FLASHINGS TO BE JOINED

USING A SCREWDRIVER OR

SCRATCH AWL.

REMOVE THIS MATERIAL FROM

THE 'INSIDE' FLASHING ONLY.

RE-CLOSE HEMS WITH

'DUCKBILL' PLIERS

CAULK AND RIVET

AS REQUIRED

Sealing End Laps & Lapping the Hems

Typical Flashing Lap

STEP 1

STEP 2

Note: Flashing expansion joints may be required for long

lashing runs (i.e. 40 t. +).

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

46 March 2024 • ASC Building Products

www.ascbp.com

Procedures

• When installing metal roofing panels, “B1”, the Drip

Flashing, is preferred at the head.

• A horizontal cut, 1" long, needs to be made in the wall

panel at the intersection of the jamb and head trim.

Extend the head trim into this slot, allowing for proper

drainage to the outside of the building.

• Concealed neoprene closures let out for clarity. Place

inside closure behind panel at C-metal (C-1) or base

trim (B1)

Wall Details

Window/Door Trim Corner

3/8" HEM

7/8"

2 1/8"

1/2"

3/8" HEM

ASC'S LIGHT

GAUGE WALL PANEL

BASE TRIM (B1)

C-METAL (C1)

BASE TRIM (B1)

(If required)

C-METAL (C1)

(If required)

3. #12 x 3/4" STITCH SCREW

4. #14 x 7/8" SELF DRILLER

@ EACH RIB OR EVERY 8" O.C.

FOR 2-1/2 CORRUGATED

1. #9 WOOD SCREW

2. #14 WOOD SCREW

@ 24" O.C. MAX

C-METAL (C1) OR

BASE TRIM (B1)

ASC'S LIGHT

GAUGE WALL PANEL

C-METAL (C1)

GLAZING AND WINDOW

FRAME BY OTHERS

1. #9 WOOD SCREW

2. #14 WOOD SCREW

@ 24" O.C. MAX

Note: “C1” is shown at head location. “B1”, Base Trim, can

also be used.

ASC Building Products

Metal Roofing Installation Guide • March 2024 47

Procedures

• Open framing shown. If installing over plywood/OSB,

use a #14 wood screw for panel attachment.

• Concealed neoprene closures let out for clarity. Place

bottom closure behind panel at base trim and top

closure on top of sheet behind “C1” at panel top, if

required.

Wall Details

Top and Bottom Trim

3/8" HEM

7/8"

2 1/8"

1/2"

3/8" HEM

ASC'S LIGHT

GAUGE WALL PANEL

BASE TRIM (B1)

C-METAL (C1)

BASE TRIM (B1)

(If required)

C-METAL (C1)

(If required)

3. #12 x 3/4" STITCH SCREW

4. #14 x 7/8" SELF DRILLER

@ EACH RIB OR EVERY 8" O.C.

FOR 2-1/2 CORRUGATED

1. #9 WOOD SCREW

2. #14 WOOD SCREW

@ 24" O.C. MAX

TOP OF WALL

Metal Roofing Panels

Installation Guide for Delta Rib

™

, Delta Rib

™

III, Nor-Clad

, Strata Rib

& 2½” Corrugated

48 March 2024 • ASC Building Products

www.ascbp.com

3/8" HEM

3 1/2"

5/8"

3/8" HEM

1 1/8"

SYMMETRICAL

BUTYL MASTIC TAPE

ASC'S LIGHT

GAUGE WALL PANEL

3. #12 x 3/4" STITCH SCREW

4. #14 x 7/8" LAP SELF DRILLER

@ 24" O.C. MAX

INSIDE CORNER (IC1)

1. #9 WOOD SCREW

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

IC1

Procedures

• Open framing shown. If installing over plywood/OSB,

use a #14 wood screw for panel attachment.

• Nor-Clad

panel shown. When installing other metal

roofing panels, use the Universal Inside Corner “IC2”.

• In many situations, the last panel installed at the corner

will require that the panel be cut in width. Allow the cut

edge to be covered by the inside corner trim.

Wall Details

Inside Corner

IC2

ASC Building Products

Metal Roofing Installation Guide • March 2024 49

1 1/8"

3/8" HEM

5/8"

3/8" HEM

3 1/2"

SYMMETRICAL

BUTYL MASTIC TAPE

OUTSIDE CORNER (OC1)

ASC'S LIGHT

GAUGE WALL PANEL

1. #9 WOOD SCREW

2. #14 WOOD SCREW

SEE ILLUSTRATION

ON PAGE 7

3. #12 x 3/4" STITCH SCREW

4. #14 x 7/8" LAP SELF DRILLER

@ 24" O.C. MAX

Wall Details

Outside Corner

OC1

OC2

Procedures

• Open framing shown. If installing over plywood/OSB,

use a #14 wood screw for panel attachment.

• Nor-Clad

panel shown. When installing other metal

roofing panels,use the Universal Outside Corner “OC2”.

• In many situations, the last panel on each side will

project beyond the building corner, requiring the

panel to be cut in width. Allow the cut edge to be

covered by the outside corner trim.

All information stated in the catalog is correct at time of printing and subject to change without notice, check our website for the latest version.

is a registered trademark of BlueScope Steel Ltd.

Printed in the USA. 0524 web BR128

Manufacturing Facilities:

Anchorage, Alaska

2441 Cinnabar Loop

Anchorage, AK 99507

West Sacramento, California

2110 Enterprise Boulevard

West Sacramento, CA 95691

Salem, Oregon

4063 Salem Industrial Drive NE

Salem, OR 97303

Customer Service Center

800-272-7023 • 503-390-7174

Spokane, Washington

4111 East Ferry Avenue

Spokane, WA 99202

Customer Service Center

800-776-8771 • 509-536-4097

Corporate Headquarters:

ASC Profiles

2110 Enterprise Boulevard

West Sacramento, CA 95691

Visit us at our website: