United States / Build / Westlake Royal ribbed valley metal

Westlake Royal ribbed valley metal

Name: Westlake Royal ribbed valley metal
Brand: Westlake Royal Roofing LLC

This is a listed roofing assembly. Match the model and orientation.

A 26-gauge galvanized-steel valley flashing documented as corrosion resistant, in a 10-foot length and minimum 22-inch width.

Kind: prescriptive-product. Brand: Westlake Royal Roofing LLC. Page reviewed 2026-08-24. JSON (CC BY 4.0)

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Can you use it here?

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Documented attributes

Each value below points to its field-level manufacturer, official-listing, test-report, or standard-body evidence.

Attribute	Value	Evidence source
Form
Assembly role	valley flashing	Ribbed valley metal (manufacturer)
Dimensions
Sheet gauge	26	Ribbed valley metal (manufacturer)
Material
Material	galvanized steel	Ribbed valley metal (manufacturer)
Corrosion resistant	Yes	Ribbed valley metal (manufacturer)

Where this product goes

FA Exhibit DET-008. Valley: 26-ga metal over D3909 cap sheet, layered

Published requirement matches

These links are generated from the cited attributes above. They do not decide installation or a project result.

Colorado CWRC valley flashing · Colorado jurisdictions adopting CWRC in mapped wildfire hazard areas
California roof-valley flashing · California mapped fire hazard areas
2018 IWUIC valley flashing · Jurisdictions adopting unamended 2018 IWUIC Chapter 5
2021 IWUIC valley flashing · Jurisdictions adopting unamended 2021 IWUIC Chapter 5
IWUIC valley flashing · Jurisdictions adopting unamended 2024 IWUIC Chapter 5
ORSC R327 valley flashing · Oregon local jurisdictions that adopted ORSC R327

Models named on the listing

Model	Application
90610

Specification notes

The code detail also names a minimum 36-inch underlayment; this flashing record does not address that layer.
Confirm valley width, diverter height, overlaps, fastening, roof compatibility, and regional availability.

Can I use this here

Local force

The rule and every matching product for the United States

Requirement constraints (6)

Each table compares this product's documented attributes with one published requirement. The comparison does not change from place to place, so it is printed once.

ORSC R327 valley flashing matched
Field	Required	Documented value	State
Assembly role	Assembly role = valley flashing	valley flashing	matched
Sheet gauge	Sheet gauge ≤ 26	26	matched
Corrosion resistant	Corrosion resistant = Yes	Yes	matched
Material	Material is one of galvanized steel	galvanized steel	matched

IWUIC valley flashing matched
Field	Required	Documented value	State
Assembly role	Assembly role = valley flashing	valley flashing	matched
Sheet gauge	Sheet gauge ≤ 26	26	matched
Corrosion resistant	Corrosion resistant = Yes	Yes	matched
Material	Material is one of galvanized steel	galvanized steel	matched

California roof-valley flashing matched
Field	Required	Documented value	State
Assembly role	Assembly role = valley flashing	valley flashing	matched
Sheet gauge	Sheet gauge ≤ 26	26	matched
Corrosion resistant	Corrosion resistant = Yes	Yes	matched
Material	Material is one of aluminum, copper, galvanized steel, stainless steel, steel, zinc	galvanized steel	matched

Colorado CWRC valley flashing matched
Field	Required	Documented value	State
Assembly role	Assembly role = valley flashing	valley flashing	matched
Sheet gauge	Sheet gauge ≤ 26	26	matched
Corrosion resistant	Corrosion resistant = Yes	Yes	matched
Material	Material is one of galvanized steel	galvanized steel	matched

2018 IWUIC valley flashing matched
Field	Required	Documented value	State
Assembly role	Assembly role = valley flashing	valley flashing	matched
Sheet gauge	Sheet gauge ≤ 26	26	matched
Corrosion resistant	Corrosion resistant = Yes	Yes	matched
Material	Material is one of galvanized steel	galvanized steel	matched

2021 IWUIC valley flashing matched
Field	Required	Documented value	State
Assembly role	Assembly role = valley flashing	valley flashing	matched
Sheet gauge	Sheet gauge ≤ 26	26	matched
Corrosion resistant	Corrosion resistant = Yes	Yes	matched
Material	Material is one of galvanized steel	galvanized steel	matched

Sources

Ribbed valley metal — Westlake Royal Roofing LLC (manufacturer). Accessed 2026-08-24.

Westlake Royal ribbed valley metal. FireApproved. https://fireapproved.com/materials/westlake-royal-ribbed-valley-metal/. Last verified 2026-08-24.