NC Roofing Contractor key terms

A water-resistant or waterproof membrane installed over roof decking beneath the primary roof covering. It provides a secondary weather barrier where wind-driven rain or ice penetrates the outer layer.

A self-adhering waterproof membrane applied along eaves, valleys, and other vulnerable areas before underlayment. It seals around fasteners and prevents water backup from melting snow or ice dams from entering the structure.

A formed metal flashing fixed along roof edges that directs runoff away from fascia and decking. Proper installation sheds water clear of the building and helps protect underlying wood from rot.

Sheet metal or membrane material used to seal roof intersections, penetrations, and edges against water entry. Common locations include valleys, chimneys, walls, skylights, and vents.

L-shaped metal pieces woven in steps against a sidewall or chimney and over each shingle course. Each piece diverts water onto the roof surface rather than behind the siding.

Metal or membrane embedded in a masonry wall or chase that overlaps the top of base flashing. It prevents water from getting behind the flashing assembly at the wall junction.

The structural surface, usually wood sheathing or planks, that supports underlayment and the roof covering. Deck condition and nailing surface directly affect the performance and wind resistance of the finished roof.

Panels such as plywood or oriented strand board fastened to rafters or trusses to form the roof deck. Thickness, span rating, and fastener schedule must meet code and manufacturer requirements.

A prefabricated engineered structural frame that supports roof loads and spans between bearing walls. Trusses must be installed per engineered drawings, with bracing and connections inspected before covering.

A ridge of ice at the eave caused when snowmelt refreezes before draining. Water backs up under shingles and can leak into the attic, making attic insulation and ventilation critical.

Intake and exhaust openings that move air through the attic or roof assembly to control heat and moisture. Balanced ventilation reduces condensation, extends shingle life, and helps prevent ice dams.

A material that limits moisture vapor diffusion through a building assembly. Placement depends on climate and assembly design; in North Carolina, warm humid conditions require careful attention to avoid trapping moisture.

Water that forms when moist air contacts a cooler surface within the roof assembly. Trapped condensation can rot decking and framing, so ventilation and vapor control must work together.

A roof with a slope generally below 3:12 that cannot reliably shed water by gravity alone. It requires continuous membrane systems such as built-up, modified bitumen, TPO, or EPDM rather than standard shingles.

A single-ply thermoplastic polyolefin roofing sheet joined by heat welding. It is common on low-slope commercial roofs and requires proper seam testing and attachment per manufacturer specifications.

A thermoset synthetic rubber single-ply membrane commonly used on flat and low-slope roofs. Sheets are joined with adhesive or tape and are valued for flexibility and ozone resistance.

A low-slope system of alternating layers of bitumen and reinforcing felt or fabric, topped with surfacing. Also called BUR, it relies on multiple plies and proper flashing details to resist water.

A reinforced asphalt sheet modified with polymers to improve flexibility and durability. It is applied on low-slope roofs by torch, hot asphalt, or cold adhesive and requires careful seam and flashing work.

A roof with enough pitch, typically 3:12 or greater, to shed water rapidly. Asphalt shingles, tile, metal, and wood shakes are common coverings on these roofs.

The ratio of vertical rise to horizontal run, expressed as inches per foot, such as 4:12. Slope determines which roof coverings are permitted and how underlayment and flashing must be installed.

The internal intersection where two roof planes meet and concentrate runoff. Valleys require special flashing or lining and a specific shingle or membrane installation method to prevent leaks.

The highest horizontal line where opposing roof planes meet. Ridge vents are often installed there to exhaust attic air, and ridge caps cover the intersection of the roof coverings.

An external roof intersection where two sloping planes meet, forming a ridge-like corner. Hip roofs distribute wind loads well and require hip flashing or caps along the joint.

The specified pattern, spacing, type, and number of nails or screws required to attach roof components. Following the schedule is essential for wind uplift resistance and manufacturer warranty compliance.

A condition where a fastener backs out of the deck and lifts the shingle above it. It can result from improper nailing, deck movement, or thin sheathing and often requires repair or replacement.

The upward force exerted by wind on a roof covering, especially at edges and corners. Resistance depends on attachment methods, edge metal, and compliance with code wind-design requirements.

A systematic examination of roof covering, flashing, drainage, and penetrations to identify defects or damage. Findings should be documented with photos and written scope for repair or replacement decisions.

A written list of incomplete or defective work identified near project completion that the contractor must correct. Sign-off typically precedes final payment and release of retainage.

The stage at which work is sufficiently finished for the owner to use the project for its intended purpose, even though minor items remain. It often triggers warranty start dates and retainage obligations.

A percentage of each progress payment withheld by the owner until project completion to protect against unfinished or defective work. North Carolina law limits and regulates retainage on construction contracts.

A written modification to the contract scope, price, or schedule signed by authorized parties. Without a properly executed change order, a contractor may be unable to recover extra costs.

A statutory claim filed against real property by a contractor or supplier who has not been paid for labor or materials. Strict notice and filing deadlines apply under North Carolina law.

Systems and practices that prevent workers from falling from heights, such as guardrails, personal fall arrest, and safe access. OSHA requires protection at specified elevations and around roof openings.

A harness, lanyard, and anchor arrangement designed to stop a fall and limit forces on the body. It requires trained users, inspection, and adequate anchor strength and clearance.

Correct selection, setup, and use of ladders, including the four-to-one angle, three-point contact, and securing the top. Ladder misuse is a leading cause of roofing injuries and citations.

The North Carolina Roofing Contractors Licensing Board, which examines applicants and enforces licensing statutes and rules. It has authority over licensure, discipline, and continuing compliance requirements.

The credential required to contract for roofing work above a statutory cost threshold in North Carolina. Unlicensed contracting can result in penalties and limits on collecting compensation for work performed.

Official authorization from a local code enforcement agency to construct or alter a structure. Roofing work must comply with permitted scope, and inspections may be required before concealment.

A document issued by the code official confirming that a building complies with applicable codes and may be occupied. It is distinct from a roofing permit and is tied to the overall building approval.