Roofing Glossary

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).

TESTIMONIALS

Emily P. of Arlington, Arlington County, VA 22207

(Found on CheckBook.org) Wonderful experience with Edgar Li of Crystal Exteriors! We had an improperly installed and oddly sized entry door that needed to be replaced. I worked with three different installers, none could find a door that matched our contemporary style or budget (one quoted me $11,000 for a fiberglass door!) and none was willing to work with me to find a solution. Mr. Li found us a beautiful modern Provia door that was reasonably priced and his team did a great job of installing it, including fixing existing problems with the siding and trim. The best thing about working with Mr. Li was his responsiveness, he answered my emails promptly and patiently explained our options. He was quick to provide the quote and samples and came back himself to make sure everything was perfect. Would absolutely recommend using his company.

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