Roofing Glossary

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There are 5 names in this directory beginning with the letter V.
Valley
The internal angle formed by the intersection of two sloping roof planes to provide water runoff.

Vapor retarder
Any material used to prevent the passage of water vapor. Material which, when installed on the high-vapor-pressure (warm in winter) side of a material, retards the passage of moisture vapor to the lower-pressure (cold in winter) side. Note exception: Florida and Gulf Coast. Check local building codes to determine on which side the vapor retarder should be placed.

Vent
Any outlet for air that protrudes through the roof deck, such as a pipe or stack. Any device installed on the roof, gable or soffit for the purpose of ventilating the underside of the roof deck.

Vent sleeve
See collar.

Ventilators
Devices that eject stale air and circulate fresh air (e.g. ridge, roof, gable, undereave, foundation or rafter vents and vented soffit panels).