Quick definition
Valley flashing protects the internal angle where two sloped roof planes meet and concentrate water flow.
Valleys carry more water than most roof areas, so they need correct underlayment, metal or woven details, and clean drainage paths.
Concentrated Drainage
Inspection Notes
What it means for you
Why does valley flashing matter?
Valleys carry more water than most roof areas, so they need correct underlayment, metal or woven details, and clean drainage paths.
Sources
- PRE Editorial Reference Standard. Professional Roofing Encyclopedia.
Tier 2 authority · industry
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