Red Seal Roofer key terms

A system of guardrails, personal fall-arrest equipment, or safety nets used to prevent or arrest a worker's fall from a roof edge, opening, or ladder.

A temporary or permanent barrier placed along an exposed roof edge or opening to stop workers and materials from falling to a lower level.

An assembly of full-body harness, lanyard, and anchor point that stops a falling worker; it limits arrest forces and must include a rescue plan.

A structural member or engineered fitting, rated for fall arrest loads, to which a lifeline or lanyard is attached so a fallen worker is held safely.

A fibrous mineral once common in roofing cements, felts, and shingles; disturbing it releases respirable fibres that cause serious lung disease, so identification and controls are required before work.

A pre-work assessment that identifies asbestos, lead, mould, or other contaminants in existing roofing so safe removal and disposal procedures can be planned.

A fitted mask that filters or supplies clean air to protect the wearer from dust, fibres, solvent vapour, or other airborne roofing hazards.

A document supplied with a chemical product that lists its hazards, safe handling, protective equipment, and first-aid measures; workers must have access to it.

A written authorisation required before torches, kettles, or grinders are used, confirming fire precautions, fire watch, and safe conditions on and around the roof.

A person stationed to monitor hot work and the surrounding area for ignition during and after the task, with authority to stop work and sound an alarm.

A heated tank, usually propane or oil fired, that melts and holds bitumen at working temperature for mopping or pouring during built-up roofing.

Correct selection, setup, and use of ladders, including the four-to-one angle, secure footing, three-point contact, and extension above the landing.

A unit of roof area equal to 100 square feet (about 9.3 square metres); material quantities and labour are commonly estimated in squares.

The slope of a roof expressed as the ratio of vertical rise to horizontal run, such as 4:12, which determines the roofing system and drainage approach.

A roof with a slope of less than 3:12 (about 14 degrees), typically covered with built-up, modified bitumen, or single-ply membrane systems.

A roof with a slope of 3:12 or greater, typically finished with shingles, shakes, tiles, or metal panels designed to shed water quickly.

A systematic listing of material quantities and dimensions taken from drawings and specifications, used for ordering, layout, and cost estimating.

A detail drawing prepared by a contractor or fabricator showing how a component will be made and installed, submitted for review before fabrication.

The structural surface that supports the roofing system, such as plywood sheathing, oriented strand board, wood plank, or concrete.

Panels or boards fastened over rafters or joists to form a solid base for underlayment and the finished roofing.

A membrane or saturated felt layer installed over the deck beneath the finished roofing to provide a secondary barrier against water penetration.

A ridge of ice at the roof edge formed when meltwater refreezes, which can force water under shingles and cause interior leaks.

A water-resistant membrane installed along the lower roof edge and in valleys to resist water backup from ice dams and wind-driven rain.

A membrane made by alternating layers of bitumen and reinforcing felt, finished with a surfacing, to produce a durable low-slope covering.

Applying hot bitumen with a mop to bond roofing plies or to embed a surfacing layer during built-up roofing installation.

A bituminous sheet membrane strengthened with polymer modifiers and factory-applied reinforcement, applied by torch, hot asphalt, or cold adhesive.

A method of heat-fusing modified bitumen sheets by melting the underside with a propane torch while unrolling, requiring strict fire precautions.

A factory-made sheet of synthetic rubber or plastic, such as EPDM, TPO, or PVC, installed in one layer over low-slope roofs.

The joint where two membrane edges are joined by adhesive, heat welding, or tape to create a continuous watertight surface.

Waterproofing material installed at roof intersections, edges, penetrations, and walls to direct water away from joints and prevent leakage.

A metal or membrane strip secured to a wall or curb that overlaps the base flashing, shedding water away from the junction and protecting the joint.

The lower flashing component attached to the roof surface and turned up against a wall, curb, or penetration to start the waterproofing seal.

A metal strip fixed along the eave or rake that extends beyond the roof edge, letting water drip clear of fascia and deck.

A fitting through the roof deck that collects water from the surface and discharges it into a leader or drainage system.

An opening through a parapet wall that lets water drain off the roof to the exterior, often fitted with a conductor head or strainer.

The designed fall of a low-slope roof toward drains, scuppers, or gutters, commonly created with tapered insulation or sloping deck framing.

Material placed in the roof assembly to reduce heat flow, improve energy performance, and help control condensation and surface temperatures.

Rigid insulation boards cut to varying thicknesses and laid in a pattern that creates the slope needed to drain water toward roof outlets.

A low-permeability layer placed on the warm side of roof insulation to limit moisture vapour movement into the assembly and reduce condensation risk.

The intentional movement of air through a roof or attic space to remove moisture and heat, using vents, soffits, and ridge openings sized for the area.

Removing existing roofing materials down to the deck before installing a new system, allowing inspection and repair of the substrate.

Installing a new roof covering over an existing one after verifying the structure and code allow it, avoiding the cost of full removal.