P | Roofing Glossary

Roofing Glossary, a collection of terms used in the roofing industry

There are 639 entries in this glossary.

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Term	Definition
Pallet	A platform, generally from wood, used to hold materials.
Pan	(1) The concave piece of "Pan and Cover" tile whose rounded surface touches the top side of the roof substrate. (2) The flat part of a roofing panel located between the ribs.
Pan Flashing	A sheet metal flashing that covers an equipment platform and is designed to counter flash the base flashings surrounding the platform.
Parapet Wall	That part of a perimeter wall that extends above the surface of the roof. Where extending above a roof, it may simply be the portion of an exterior wall that continues above the line of the roof surface, or may be a continuation of a vertical feature beneath the roof such as a fire wall or party wall.
Pass	The term used to describe the application of one layer of Spray Polyurethane Foam (SPF). The speed of a pass will determine foam thickness.
Pass Line	The distinct line formed between two passes of SPF. This line is the top skin of the bottom pass of the SPF.
Penetration	Any object that pierces the surface of the roof.
Percent Elongation	The maximum amount that a material can be lengthened or stretched before breaking; expressed as a percentage of the original length of material tested.
Perlite	A natural volcanic glass having distinctive concentric cracks and a relatively high water content.. Perlite in a fluffy heat expanded form is used in lightweight insulating concrete, fire-resistant rigid insulation board (R = 2.78 per inch) and potting soil.