Roofing Glossary

Roofing Glossary

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There are 6 names in this directory beginning with the letter N.
Natural ventilation
A ventilation system utilizing ventilators installed in openings in the attic and properly positioned to take advantage of natural air flow to draw hot summer or moist winter air out and replace it with fresh outside air.

Nesting
A method of reroofing with new asphalt shingles over old shingles in which the top edge of the new shingle is butted against the bottom edge of the existing shingle tab.

Net Free Vent Area (NFVA)
Area unobstructed by screens, louvers or other materials.

No-cutout shingles
Shingles consisting of a single, solid tab with no cutouts.

Non-veneer panel
Any wood-based panel that does not contain veneer and carries an APA span rating, such as wafer board or oriented strand board.

Normal-slope application
Method of installing asphalt shingles on roof slopes between 4 inches and 21 inches per foot.

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David K. of North Potomac, M

I had all my 18 windows replaced over the last summer. I evaluated two contractors and both gave excellent sales presentations and the prices were competitive. I decided to use Crystal Exteriors because I felt the owner of Crystal Exteriors, Edgar Li, was very professional and willing to work with me, in terms of pricing and other issues. The work was done in a professional manner. After the windows were replaced, Edgar himself stopped by few times to make sure that the windows were satisfactory.”

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