Click on colorful terms to see a picture. Some terms, such as various methods, will not have pictures.
Mansard Roof: A type of roof containing two sloping planes of different pitch on each of four sides. The lower plane has a much steeper pitch than the upper, often approaching vertical. Includes no gables.
Masonry Primer: An asphalt-based primer used to prepare masonry surfaces for bonding with other asphalt products.
Mats: The general term for the base material of shingles and certain rolled products.
Mineral Stabilizers: Finely ground limestone, slate, taprock, or other inert materials added to asphalt coatings for durability and increased resistance to fire and weathering.
Mineral-Surfaced Roofing: Asphalt shingles and roll roofing that are covered with granules.
Modified Bitumen: Rolled roofing membrane with polymer modified asphalt and either polyester or fiberglass reinforcement.
Mopping: The application of hot bitumen, with a roofer’s hand mop or mechanical applicator, to the substrate or to the felts of a bituminous membrane.
Mortar: Mixture of sand, mortar, limestone, and water used in bonding a chimney’s bricks together.
Nail Guide Line: Painted line on laminated shingles, to aid in the proper placement of fasteners.
Nail Pop: When a nail is not fully driven, it sits up off the roof deck.
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. While this method does offer more coverage, it is not recommended by Argive Roofing because it is less secure against wind and wear, and will not last as long as a roof secured to the decking or bottom substrate.
Net Free Vent Area (NFVA): Area unobstructed by screens, louvers, or other materials.
No Cut-Out 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.
NRCA: The National Roofing Contractors Association. Respected national organization of roofing contractors.
Open Valley: Method of valley construction in which shingles on both sides of the valley are trimmed along a chalk line snapped on each side of the valley. Shingles do not extend across the valley. Valley flashing is exposed.
Organic Felt: An asphalt roofing base material manufactured from cellulose fibers.
Organic Mat: Material made from recycled wood pulp and paper.
Organic Shingles: Shingles made from organic (paper) mats.
OSB: Oriented Strand Board. A decking made from wood chips and lamination glues.
Overdriven: The term used for fasteners driven through roofing materials with too much force, breaking the material.
Overexposed: Installing shingle courses higher than their intended exposure.
Overhang: That portion of the roof structure that extends beyond the exterior walls of a building.