Red Seal Carpenter key terms

A procedure that isolates a machine or circuit from its energy source, applies a personal lock and tag, and verifies zero energy before work begins, preventing accidental startup or release of stored energy.

Wearable gear such as hard hats, safety glasses, hearing protection, gloves, and respirators that reduces a worker's exposure to hazards but does not replace engineering controls or safe work procedures.

Equipment and procedures that arrest or prevent a fall from height, including guardrails, personal fall arrest harnesses with lanyards and anchors, and safety nets, selected according to the task and fall distance.

A temporary elevated platform with supporting structure used to work above ground; it must be erected on firm footing, plumb, fully planked, and equipped with guardrails and safe access before use.

A written workplace program covering hazard assessment, fit testing, medical clearance, respirator selection, training, and care, required when dust, silica, solvents, or other airborne contaminants cannot be controlled by ventilation alone.

Temporary supports such as hydraulic shores, shields, or sloping used to protect workers in excavations from cave-in; required by regulation once a trench reaches a specified depth and whenever soil conditions are unstable.

A power saw with a toothed blade that projects through a base plate; the blade guard, riving knife, and stable support must be used, and the blade depth is set just beyond the thickness of the material being cut.

A stationary power saw that pivots to cut angles across a board and, on compound models, bevels the blade to cut slopes, used for trim, rafters, and other angled members with repeatable accuracy.

A handheld power saw with a back-and-forth blade stroke, useful for demolition, cutting in tight spaces, and cutting pipe or nails where a circular blade cannot reach.

A forged steel bar with a forked, curved claw used to pull nails and pry apart nailed assemblies; its thin tip allows it to be driven under nail heads in framing and demolition work.

An L-shaped steel square with a long blade and shorter tongue marked with graduations and tables, used to lay out and check square, plumb, and angle cuts for rafters, stairs, and framing.

A triangular layout tool with a fence and degree markings that quickly marks square lines, 45-degree cuts, and common rafter angles, and serves as a guide for a circular saw.

An optical instrument that establishes a level line of sight and measures vertical differences, used to set elevations for footings, slabs, and site grading over long distances.

A device that projects a level or plumb reference line or plane of light onto surfaces, allowing fast layout of elevations, walls, and ceilings without a tripod-mounted optical instrument.

A scaled construction drawing that shows plan, elevation, section, and detail views with dimensions and notes, from which materials are ordered and the work is laid out and built.

A written project document that states the required materials, standards, workmanship, and testing for each part of the work, and that governs wherever it differs from the drawings.

A written change issued during the bidding period that modifies the drawings or specifications before contract award; it becomes part of the contract documents and must be reflected in the bid.

A written, signed amendment to the contract after award that changes scope, cost, or schedule; no extra work should proceed without one unless the contract allows a field directive.

The ratio between a drawing measurement and the real dimension it represents, such as 1:50; dimensions written on the drawing always take precedence over measurements scaled from the paper.

A fixed, known reference point of established elevation or position on or near the site, from which all other elevations and layout are transferred and checked.

A horizontal board fixed to stakes outside the excavation, set at a known elevation and aligned with building lines, that carries the strings used to locate footings and foundation walls.

A tensioned cord stretched between established points to mark a straight line or plane, used to align footings, walls, and formwork and to check straightness over long distances.

A pointed weight hung from a cord to establish a true vertical line, used to transfer points from above to below and to check that posts, walls, and forms are plumb.

The temporary molds, sheathing, and falsework that hold concrete in place until it cures, designed to carry the weight and pressure of fresh concrete without deflection or movement.

A metal rod or strap that passes through wall forms and holds the two faces at the correct spacing against the pressure of wet concrete; break-back and snap ties leave no metal at the surface.

A coating applied to form surfaces so cured concrete separates cleanly without tearing the face or damaging the form, improving surface finish and extending form reuse.

A deliberate groove or weakened plane in a concrete slab that forces shrinkage cracking to occur along a straight, planned line instead of randomly across the surface.

Maintaining adequate moisture and temperature in placed concrete so cement hydration continues, developing strength and durability; curing must begin soon after finishing and continue for the specified period.

A framing method in which each storey's floor is built as a platform on which the walls are erected, with studs one storey high and walls capped by double top plates that support the next floor.

An older framing method in which continuous studs run the full height of the building and floor joists attach to a ledger let into the studs, requiring fire blocking in the concealed stud spaces.

A short vertical framing member nailed beside a king stud under a header to carry the header's load down to the sole plate; also called a trimmer stud.

A horizontal framing member that spans an opening in a wall and carries the loads above it to the jack studs on each side; its size depends on span and load.

The full-height stud nailed to each side of a rough opening, running from sole plate to top plate and providing the nailing surface and lateral support for the header assembly.

The printed scales on the tongue of a framing square giving unit lengths and cuts for common, hip, and valley rafters at various roof pitches, used to lay out rafters accurately.

The sloping rafter that runs diagonally from the outside corner of a wall to the ridge, forming the intersection of two roof planes on a hip roof and typically longer than a common rafter.

The horizontal member at the peak of a roof against which the upper ends of opposing rafters are nailed; it aligns the rafters and is not itself a structural beam in most conventional roofs.

Material installed to fill concealed cavities in walls and floors at specified locations, preventing the chimney effect that lets fire and smoke travel quickly through hidden framing spaces.

Sheet metal or a membrane installed to shed water at joints and penetrations such as roof valleys, chimneys, walls, and window heads, directing water out and away from the building envelope.

A membrane or sheet applied over sheathing behind cladding to stop wind-driven rain from reaching the framing while allowing water vapour to escape; laps and penetrations must be sealed.

A flashing profile fixed above a window or door head that projects and turns down at the front edge so water drips clear of the opening rather than running down the wall or behind the trim.

A low-permeability membrane placed on the warm side of insulation to limit moisture diffusion into wall and ceiling assemblies, with joints lapped and sealed to remain continuous.

The finished underside surface of an overhanging roof eave, often vented to admit air into the roof space while closing the gap between the wall and the fascia.

The vertical board fixed to the ends of rafters or trusses along the roof edge, supporting the gutter and forming the outer face of the eave.

A coarse-threaded screw with a bugle head and sharp point designed to attach gypsum board without tearing the paper face; length is chosen so it penetrates the framing by the required amount.

The sequence of embedding tape in joint compound over board joints, corners, and fasteners, then applying progressively wider coats and sanding to produce a smooth surface ready for decoration.

A technique of gluing a strip of gypsum board behind a butt joint to stiffen it and reduce cracking, used where a joint does not fall on framing and cannot be taped reliably.

The vertical face of a stair step, measured as the height from the top of one tread to the top of the next; all risers in a flight must be equal to within a small tolerance.

The horizontal walking surface of a stair step, measured from the nosing of one tread to the nosing of the next; tread depth and nosing projection affect safe footing.

The sloping structural member that supports the treads and risers of a stair; it is notched to receive them or fitted with cleats, and its size depends on the stair span and load.

The rounded projection of a tread beyond the face of the riser below it, which enlarges the effective walking surface and must meet minimum and maximum projection limits.

The vertical distance from the top of one tread to the top of the next, used with the unit run to calculate the number of risers and the total stair layout.

The controlled removal, enclosure, or encapsulation of asbestos-containing materials by trained workers using containment, regulated work practices, and disposal procedures before renovation disturbs them.

An inspection and testing of an existing building for asbestos, lead paint, mould, or other contaminants before renovation begins, so that safe work methods and disposal can be planned.

A horizontal member fastened to a building or beam to support joists, deck framing, or stair stringers; its attachment must resist both vertical loads and lateral pull-out.

A galvanized metal bracket that connects a joist end to a header or ledger, transferring load through the fasteners and allowing the joist to sit flush with the supporting member.

A vertical structural member that carries deck loads to footings; it must be sized for the load, connected to resist uplift and lateral movement, and protected from decay at the ground.

A barrier along the open edges of a deck, balcony, or stair that resists lateral force and includes an infill pattern that prevents passage of a small sphere, protecting against falls.

A written list of incomplete or defective items identified at substantial completion, which the contractor must correct before final payment and acceptance of the work.