Section 403.2.2 Explained: Why Roof Valleys Matter

The Small Roofing Detail That Can Make a Big Difference

When homeowners think about wildfire protection, they often focus on roofing materials.

What many don't realize is that one of the most vulnerable parts of any roof is the roof valley.

The Colorado Wildfire Resiliency Code specifically addresses this area in Section 403.2.2, requiring enhanced protection to reduce the risk of ember ignition.

What Is a Roof Valley?

A roof valley is where two roof slopes meet.

Because of their shape, valleys naturally collect:

• Pine needles

• Leaves

• Small branches

• Wind-blown debris

Unfortunately, they also collect burning embers during wildfires.

Why Is This Dangerous?

When embers land in debris-filled valleys, they can ignite combustible materials hidden beneath roofing products.

This is one of the reasons the CWRC now requires:

• Corrosion-resistant metal flashing

• Enhanced underlayment beneath the valley

• Continuous protection from the ridge to the eave

These additions provide another layer of defense in one of the roof's highest-risk areas.

Why Proper Installation Matters

Even the best roofing products can underperform if they're installed incorrectly.

Proper flashing, underlayment, fastener placement, and valley construction all play an important role in protecting your home.

At Higher Ground Roofing, we install roofing systems with attention to every detail—not just what's visible from the street.