MIL-HDBK-1001/SA
Picture framing. Rectangular membrane ridging forming over insulation board joints, found predominantly in smooth-surfaced membranes.
Pitch pocket. Flanged, open-bottomed metal container placed around a column or other roof-penetrating element and filled with bitumen or plastic cement to seal the opening.
Plastic cement. Trowelable, plastic mixture of bitumen and asbestos (or other inorganic) stabilizing fibers and a solvent, used mainly for horizontal surfaces as opposed to Flashing cement, which is designed for vertical surfaces requiring sag- resistance.
Plasticizer. High-boiling-point solvent or softening agent added to a polymer to facilitate processing or to increase flexibility or toughness in the manufactured material.
Ply. A layer of felt in a roof membrane; a four-ply membrane has at least four plies of felt at any vertical cross section cut through the membrane.
Polymer. Long-chain macromolecules produced from monomers, for the purpose of increasing tensile strength of sheets used as membranes or flashing.
Polyvinyl chloride (PVC). A thermoplastic polymer, formulated with a plasticizer, used as a single-ply sheet membrane material.
Power-trowel. Term applied to finish of a structural concrete deck slab's surface by a power-driven steel-troweling machine.
Primer. Thin liquid applied to seal a surface, to absorb dust, and to promote adhesion of subsequently applied material.
Protected membrane roof (PMR). A roof assembly with insulation atop the membrane instead of vice versa, as in the conventional roof assembly. (Also known as an inverted or upside-down roof assembly).
Psychrometric chart. A graphical representation of the properties of moist air, usually including wet and dry bulb temperatures, specific and relative humidities, enthalpy, and density.
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