PRECAST

Concrete building components which are formed and cured at a factory and then

transported to a work site for erection.

PRIMER

A material of relatively thin consistency applied to a surface for the purpose of

creating a more secure bonding surface.

PROJECTION

Any object or equipment which pierces the roof membrane.

PROTECTION BOARD

Heavy asphalt impregnated boards which are laid over bituminous coatings to

protect against mechanical injury.

PURLINS

A horizontal structural member spanning between beams or trusses to support a

roof deck.

RAGGLE BLOCK

A specially designed masonry block having a slot or opening into which the top

edge of the roof flashing is inserted and anchored.

RAKE

The angle of slope of a roof rafter, or the inclined portion of a cornice.

REFLECTIVE

A term referring to a material that has a white or shiny metallic surface.

REGLET

A horizontal slot, formed or cut in a parapet or other masonry wall, into which the

top edge of counterflashing can be inserted and anchored.

RE-IMPREGNATE

To replace oils and bitumen in the components of the BURM which through

weathering and oxidation, have been lost.