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Colorado CWRC roof-valley flashing metal path

The 2025 Colorado Wildfire Resiliency Code specifies No. 26 galvanized corrosion-resistant metal valley flashing over a full-width ASTM D3909 cap-sheet detail.

A flashing product can document the metal portion only. The 36-inch cap sheet, full-valley installation, compatibility, and locally adopted text remain separate checks.

code · Colorado jurisdictions adopting CWRC in mapped wildfire hazard areas · Last verified 2026-08-25 · JSON (CC BY 4.0)

Published requirement text

“not less than 0.019 inch (No. 26 galvanized sheet gage) corrosion-resistant metal”

2025 Colorado Wildfire Resiliency Code, Section 403.2.2 — Colorado Division of Fire Prevention and Control

Where this instrument is documented

Instrument cwrc-2025.

Set a location to read how this instrument lands where you are.

Place	Force	Reach	Dated	Checks open	Source
Colorado	published for local adoption; not active statewide	mapped area	not sourced	4	2025 Colorado Wildfire Resiliency Code

Each place page carries that place's boundary, project scope and open official checks in full; this page's JSON twin carries them per application.

Machine-readable constraints

Attribute	Operator	Value	Unit
assemblyRole	eq	valley-flashing
sheetGauge	lte	26	sheet-gauge
corrosionResistant	eq	true
material	in	galvanized-steel

Products with documented matching attributes

Open the Build rules that quote this requirement

Product	Category	Status	Documented match evidence
Westlake Royal ribbed valley metal	roofing	Attribute match	4 cited fields Assembly role: valley flashing Material: galvanized steel Sheet gauge: 26 Corrosion resistant: Yes

Sources

2025 Colorado Wildfire Resiliency Code, Section 403.2.2 — Colorado Division of Fire Prevention and Control (official). Accessed 2026-08-25.

Colorado CWRC roof-valley flashing metal path. FireApproved. https://fireapproved.com/requirements/cwrc-2025-roof-valley-flashing/. Last verified 2026-08-25.