corrosion: The deterioration of metal by chemical or electrochemical reaction resulting from exposure to weathering, moisture, chemicals, or other agents or media.

counter-flashing: A pre-formed metal that is secured to a wall, curb or rooftop unit used to cover and protect the upper edge of a base flashing and its associated fasteners.

cover board: A relatively thin substrate that’s placed over the primary thermal insulation in a roofing system.

CPI: Certified Professional Inspector

cracking: A term used to describe nonlinear visible breaks on the surface of a material.

crater: A pit in the surface of BUR resulting from a burst blueberry blister.

crawlspace: the area within the confines of the foundation and between the ground and the underside of the lowest floor’s structural component.

creep: The deformation of a material over time under persistent load.

cricket: An elevated and peaked construction installed on low-slope and structural metal roofs to divert water around roof-penetrating components.

cross-connection: any connection between two otherwise separate piping systems, one of which contains potable water, and the other that contains something that could contaminate the potable water.

crown: the sloped top of a masonry chimney designed to shed water away from the flue; also called a splay or a wash.

CSA: Canadian Standards Association

Cumulative Style Report: A reporting style for multi-family properties that creates an individual report for each unit in a building.

curb: A square or rectangular-shaped member that is built above the level of the roof that provides a means of support for flashing.

curb cut: a solid ramp that transforms a curb into an accessibility feature.

damper: a valve or plate for controlling draft or flow of gases, including air, in a vent or ductwork; a manually-operated plate for controlling draft in a flue.

dampers: Controls that vary airflow through an air outlet, inlet, or duct. A damper position may be immovable, manually adjustable, or part of an automated control system.

dead load: Static load imposed by gravitational forces acting upon the structure and permanently installed building materials, such as a roof, wall, floor, and ceiling-covering materials.

dead-level roof: A roof with no slope; a flat roof.

deck: exterior floor system supported on at least two opposing sides by an adjoining structure and/or post, piers, or other independent supports.

decorative: ornamental; not required for the operation of essential systems and components of a building.

defensible space: an area around a building designed to slow the rate of an advancing wildfire

deferred-maintenance items: deficient items that cannot be remedied with routine maintenance, generally caused by neglect.

deflection: The amount of bending movement of any part of a structural member perpendicular to the axis of the member under an applied load; also referred to as sag.

delamination: A term used to describe the separation of laminated layers, either membrane plies or insulation.

describe: to report, in writing, a system or component by its type or other observed characteristics to distinguish it from other components used for the same purpose.

destructive: an act of demolishing, damaging or probing any system, structure or component, or to dismantle any system or component that would not be taken apart by an ordinary person in the course of normal maintenance.

detectable warning: raised bumps or domes that signal via cane or underfoot an approach to a traffic lane or change in surface level.

determine: to arrive at an opinion or conclusion pursuant to examination.

diaphragm: A horizontal structural element designed to transmit lateral loads to the shear wall and is built in as part of the roof and floor structures.

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