Glossary

 

Pan

The flat portion between the ribs in a pan-type preformed sheet.

Parapet

A wall on the perimeter of a building that projects above the line of the eaves.

 

Penetration

A projection through the roof, e.g. vent pipe, chimney or rooflight.

 

Pierce-fastened

  A method of fixing cladding by means of a screw or nail which pierces the cladding.

 

Pitch

see Fall.

 

Ponding

Pooling of undrained water on a roof.

 

Pop

See Drop

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