Dictionary

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Click one of the letters above to be taken to a page of all terms beginning with that letter.
p
Parapet Wall

The part of any wall entirely above the roof.

Picture Framing

A rectangular pattern of ridges in a roof membrane over insulation or deck joints.

Pitch Pocket

A flanged, open-bottomed, metal container placed around columns or other roof penetrations that is filled with hot bitumen or flashing cement to seal the joint. The use of pitch pockets is not recommended by NRCA.

Ply

A layer of felt in a built-up roof membrane system. A four-ply membrane system has four plies of felt.

Pond

A roof surface that is incompletely drained.

Positive Drainage

The drainage condition in which consideration has been made for all loading deflections of the deck, and additional roof slope has been provided to ensure drainage of the roof area within 48 hours of rainfall.

Primer

A thin, liquid bitumen applied to a surface to improve the adhesion of subsequent applications of bitumen.