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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 listing is not a permit.

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)

Documented attributes

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

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

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

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

This trace joins product evidence to a sourced code application, then keeps every boundary, map, date, project check, documented constraint match, and still-undocumented field visible. It is not a permit result. Full explorer: Can I use this here.

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Without a place, no local application is inferred. The collapsed jurisdiction index below keeps every sourced static trace available.

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The rule and every matching product for the United States

Requirement constraints (6)

Each table below compares this product's documented attributes against one published requirement. That comparison is a fact about the product and the requirement, and does not change from place to place, so it is printed once.

Requirement constraints (6)

Each table compares this product's documented attributes with one published requirement. That comparison does not change from place to place, so it is printed once here and linked from every jurisdiction below.

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

Where this applies

A product is a national record; where it applies is a fact about a place. The rule that binds a given address — and every product matching it — is published on that place's own answer page, linked above and re-linked by the location lens. The complete per-place claim graph for this record, including every open official check, is in its JSON twin.

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.