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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Steve B. of Potomac, Montgomery County, MD 20854

(Found on CheckBook.org) I had Mr. Li (owner-Crystal Exteriors) install two exterior doors and one window. He was extremely reliable; both Mr. Li and his installers showed up precisely when they said they would. The workmanship was excellent, and they cleaned up well when they finished. I do not hesitate to recommend them."

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