CA C-39 Roofing Contractor key terms

A water-shedding sheet installed over roof sheathing and beneath the finished roof covering; it provides a secondary barrier and temporary protection before the cover is completed.

Metal or membrane pieces installed at roof edges, walls, valleys, and penetrations to redirect water away from joints and seams where the roof covering alone cannot keep water out.

Flashing attached to a wall, chimney, or curb above the base flashing and lapped over it, so runoff cannot get behind the lower flashing.

A metal or plastic strip fixed along eaves and rakes that makes water drip clear of the fascia and sheathing and helps support the overhanging edge of shingles.

The internal intersection where two sloping roof planes meet; it concentrates runoff, so it is lined with membrane or metal and detailed carefully.

A self-adhering waterproof membrane installed along eaves in cold climates to stop water backed up by ice dams from entering the roof assembly.

A low-slope roof made by alternating layers of saturated felt or fabric and hot or cold bitumen, usually finished with gravel or a coating.

A reinforced asphalt sheet with polymer modifiers that is applied on low-slope roofs by torching, hot mopping, or cold adhesive, often as a cap sheet.

A factory-made flexible sheet such as TPO, EPDM, or PVC used for low-slope roofing; seams are welded or glued and fasteners may be concealed or exposed.

A metal roof system with raised interlocking seams and usually concealed clips, allowing panels to move with temperature changes while shedding water.

The lower edge of a sloping roof that projects past the exterior wall; it receives the gutter and the first course of roofing.

A continuous vent installed at the roof peak that lets warm, moist attic air escape; it works best with matching intake vents at the eaves.

A sloping structural member that supports roof sheathing and runs from the eave to the ridge; it carries roof loads to the walls.

A horizontal board at the peak against which opposing rafters bear, keeping them aligned and helping resist thrust at the top.

The flat panels or boards fastened over rafters or trusses to form the roof deck and support underlayment and the finished roofing.

A number stamped on plywood or OSB panels showing the maximum rafter or joist spacing the panel can span when used for roof sheathing.

A small metal or plastic clip placed between panel edges at unsupported joints to keep adjacent roof sheathing panels level and aligned.

A factory-built triangular frame of lumber and metal connector plates that supports roof loads and is set at regular spacing instead of rafters.

The vertical board at the eave covering rafter ends or truss tails; it supports the gutter and gives the roof edge a finished appearance.

The slope of a roof expressed as a ratio of rise to run, such as 4:12; it affects material choice, drainage, and walkability.

The permanent weight a roof structure carries, including sheathing, roofing materials, insulation, ceilings, and permanently attached equipment.

A unit of roof area equal to 100 square feet; roofing materials, labor, and bids are commonly priced by the square.

The process of measuring and listing quantities of materials and labor needed for a job from the plans and specifications.

An allowance added to calculated material quantities to cover cutting, overlaps, breakage, and errors; it is usually a percentage of the takeoff.

A factor used with the horizontal roof area to estimate actual sloped roof area; steeper roofs have larger multipliers.

A written description of what the contractor will and will not perform, including materials, quantities, and exclusions, used to define the contract.

Written project requirements that supplement the drawings and state the materials, workmanship, testing, and installation methods the contractor must follow.

Systems and practices used to prevent workers from falling from roofs, such as guardrails, safety nets, or personal fall arrest equipment.

A harness, lanyard, anchor, and connector assembly that stops a fall and limits the forces on the worker's body.

A temporary or permanent barrier along a roof edge or opening that prevents workers from walking or falling off.

California's workplace safety enforcement agency; its construction safety orders set fall protection, ladder, and hazard rules for roofing work.

A roof assembly rating indicating resistance to fire from external sources; it is determined by testing and required in many wildland-urban interface areas.

The upward force wind exerts on a roof covering; fastening patterns and edge details must resist it according to code and product approvals.

Official authorization from a local building department to construct or reroof; work must follow approved plans and pass required inspections.

A legal claim against real property by a contractor, subcontractor, or supplier who has not been paid for work or materials provided.

A written notice, often required in California before lien rights are preserved, telling the owner and lender that a party may claim a lien.

A percentage of each progress payment withheld by the owner until the project is substantially complete, as security for unfinished or defective work.

A written agreement signed by the owner and contractor that modifies the contract scope, price, or schedule after the original contract is executed.

A surety bond guaranteeing that the contractor will complete the contract according to its terms; the surety pays if the contractor defaults.

A written contract for home improvement work that California law requires to include specific notices, payment terms, and license information.