Installation
What is Valley Flashing?
Roofing Glossary · Installation
Definition
A sheet metal or membrane lining installed in the valley of a roof to create a watertight channel for water running from both roof planes into the valley. Valley flashing comes in open valley (metal visible) and closed valley (shingles woven or cut over the flashing) configurations. Open valleys are recommended in high-rainfall and cold climates for superior drainage and reduced debris accumulation.
Related Roofing Terms
→
ValleyThe internal angle formed where two sloping roof sections meet, creating a V-shaped channel that dir...
→FlashingThin strips of impervious metal — typically galvanized steel, aluminum, or lead — installed at joint...
→Ice and Water ShieldA self-adhering, waterproof membrane installed on the roof deck in vulnerable areas — typically the ...
More Installation Terms
Get an Instant Roof Estimate
Now that you know what valley flashing means, put that knowledge to work. Enter your address to get a free satellite-based estimate and compare standardized quotes from pre-vetted local contractors.
Get My Free Estimate