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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Sandra M. of Rockville, Montgomery County, MD 20853

(Found on CheckBook.org) Edgar Li helped us previously with a big window replacement job, roof replacement, and siding repair for the sale of a family home, so I was completely confident in calling him again to replace our sliding door to the deck. In all instances, he and his crew have been excellent: in describing good quality options for the best price, in communicating and honoring an established schedule, and in performing the work. Top notch, honest, and great to deal with all around.

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