NRCA- The National Roofing Contractors Association. It is a respected national organization of roofing contractors.
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.
Over-driven- The term used for fasteners driven through roofing material with too much force, breaking the material.
Over-exposed- Installing shingle courses higher than their intended exposure.
Power vents- Electrically powered fans used to move air from attics and structures.
Plumbing vents- Term used to describe plumbing pipes that project through a roof plane. Also called vent stacks.
Prevailing wind- The most common direction of wind for a particular region.
Rake edge-The vertical edge of gable style roof planes.
Release film- The plastic sheet installed on the back of Weather Watch® and StormGuard® underlayments. Used for packaging and handling. Remove before installation.
Rigid vent- Hard plastic ridge vent material.
Roof louvers- Rooftop rectangular shaped roof vents. Also called box vents, mushroom vents, airhawks, or soldier vents.
Roof plane- A roofing area defined by having four separate edges. One side of a gable, hip or mansard roof.
Self-sealant- Sealant installed on shingles. After installation, heat and sun will activate sealant to seal the shingles to each other.
Selvage- The non exposed area on rolled roofing. Area without granules. Designed for nail placement and sealant.
Shed roof- Roof design of a single roof plane. Area does not tie into any other roofs.
Shingle-Mate®- GAFMC’s shingle underlayment. Breather type with fiberglass backing to reduce wrinkles and buckles.
Side-laps- The area on rolled material where one roll overlaps the rolled material beneath it. Also called selvage edge on rolled roofing.
Side-walls- Where a vertical roof plane meets a vertical wall. The sides of dormers etc.
Soffit ventilation- Intake ventilation installed under the eaves, or at the roof edge.
Smart Choice® System Plus Limited Warranty- GAFMC’s next grade of enhanced warranty. Extended coverage for owners.
Starter strip- The first course of roofing installed. Usually trimmed from main roof material.
Steep slope roofing- Generally all slopes higher than 4/12 are considered steep slopes.
Step-flashing- Metal flashing pieces installed at side-walls and chimneys for weather-proofing.
StormGuard®- GAFMC waterproof underlayment. Film surfaced rolled underlayment, 1.5 squares coverage per roll.
Tear-off- Removal of existing roofing materials down to the roof deck.
Telegraphing- When shingles reflect the uneven surface beneath them. Shingles installed over buckled shingles may show some buckles.
Timberline® Series- GAFMC’s trademark name for laminated wood shake style shingles.
TIMBERTEX®- GAFMC enhanced Hip and Ridge Shingles.
Transitions- When a roof plane ties into another roof plane that has a different pitch or slope.
Underlayments- Asphalt based rolled materials designed to be installed under main roofing material, to serve as added protection.
Vapor- Term used to describe moisture laden air.
Ventilation- The term used in roofing for the passage of air from an enclosed space.
Warm wall- The finished wall inside of a structure, used in roofing to determine how to install waterproof underlayments at eaves.
Warranty- The written promise to the owner of roofing materials for material related problems.
Waterproof underlayments- Modified bitumen based roofing underlayments. Designed to seal to wood decks and waterproof critical leak areas.
Weather Stopper® Integrated Roofing System™- GAFMC’s complete roofing system and components.