PMR (protected membrane roof): Also known as an IRMA (inverted roof membrane assembly), a low-slope roof having insulation that is installed on top of the membrane.

ponding: The development of a large puddle or area of standing water on a roof for prolonged periods, typically 48 hours after a rain event when conditions are favorable for drying, due to poor drainage and/or deflection of the roof deck.

positive pressure: Condition that exists when more air is supplied to a space than is exhausted, so the air pressure within that space is greater than that in surrounding areas.

post-tensioning: A pre-stressing technique whereby steel strands are tensioned after the concrete is cast.

pre-stressed: Concrete that undergoes internal stresses from reinforcing steel strands to offset tension stress of future loads.

pre-tensioning: A pre-stressing technique whereby steel strands are tensioned prior to the concrete being cast.

premises: a lot, plot, parcel of land, property or building.

pressure drop: the loss in pressure due to friction or obstruction in pipes, valves, fittings, regulators and burners, and the length of pipes and the number of elbows.

pressure regulator: a device placed in a gas line for reducing, controlling and maintaining the pressure downstream of the device.

primary building: a building that an inspector has agreed to inspect, excluding all accessory buildings, with the exception of the primary parking structure.

primary parking structure and surfaces: a building and appurtenant surfaces for the purpose of vehicle storage associated with the primary building.

psychosocial factors: Psychological, organizational, and personal stressors that could produce symptoms similar to poor indoor air quality.

public accommodation: public and private facilities that are used by the public, including a wide range of entities, such as restaurants and bars, theaters, grocery stores, shopping centers, etc.

public way: a street, alley or yard open to the outside and leading to a public area.

publicly available information: information that is accessible or available to anyone upon request.

purlins: A horizontal structural member spanning between beams or trusses to support a roof deck. In slope glazing, purlins are the horizontal framing members.

PVC (polyvinyl chloride): A thermoplastic low-slope roof membrane.

R-value: The thermal resistance of insulation or a glazing system. The R-value is the reciprocal of the U-value. The higher the R-value, the less heat is transmitted throughout the insulation or glazing material.

raceway: an enclosed channel or conduit designed expressly for holding wires or cables.

radiant heat transfer: Radiant heat transfer occurs when there is a large difference between the temperatures of two surfaces that are exposed to each other, but are not touching.

rafter: A sloping roof member that supports the roof covering and extends from the ridge or the hip of the roof to the eaves.

rail: the side members of a fixed ladder joined by cleats, rungs, or steps at uniform intervals.

rail ladder: a type of fixed ladder that consists of two long sides (rails) crossed by parallel rungs, cleats, or steps.

ramp: a sloped walking surface.

re-entrainment: Situation that occurs when the air being exhausted from a building is immediately brought back into the system through the air intake and other openings in the building envelope.

readily accessible: describes the area of the subject property that has been made available to the inspector at the time of the walk-through survey portion of the inspection, and/or a system or component that, in the judgment of the inspector, is capable of being safely observed without the need of portable ladders, the removal of obstacles, the detachment or disengagement of connecting or securing devices, or other unsafe or difficult procedures to gain access, and/or a document that has been made available to the inspector for use in the research portion of the inspection.

readily achievable: an action that can be carried out without undue monetary expense or complication.

readily ascertainable: describes information that is available to the inspector within reasonable time at a nominal cost so that it can be practically reviewed during the research portion of the inspection.

readily available: describes the information, personnel and documents that are made available quickly to the inspector.

rebar: Nickname for reinforcing bar; used to increase the tensile strength of concrete.

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