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Summary: Building dictionary to explain building jargon and terminology from A - Z.
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Building dictionary for the letter P - Page 18
Polystyrene resin
Synthetic resins, varying in color from water-white to yellow, formed by the polymerization of styrene on heating, with or without catalysts. These resins may be used in paints for concrete, for making sculptured molds, or as insulation.
Polysulfide coating
A protective coating system prepared by polymerizing a chlorinated alkyl polyether with an inorganic polysulfide. This coating exhibits outstanding resistance to ozone, sunlight, oxidation, and weathering.
Polytetrafluoroethylene (PTFE)
A fluorocarbon-based polymer with high chemical and weather resistance, low friction, and electrical and thermal insulation. The most common brand name is Teflon(r). PTFE's many construction applications include usage in hydraulic machinery and in ptimber's joint tape.
Polyurethane
Reaction product of an isocyanate with any of a wide variety of other compounds containing an active hydrogen group. Polyurethane is used to formulate tough, abrasion-resistant coatings, and is also used for foam insualtion products.
Polyurethane finish
A synthetic varnish that is exceptionally hard, and wear-resistant.
Polyurethane insulation (PUR insulation)
Any of a number of insulation products made of polyurethane. Forms include rigid boards, spray foams, and pourable mixes.
Polyvinyl acetate (PVA)
Colorless, permanently thermoplastic resin, usually supplied as an emulsion or water-dispersible powder, which may be used in paints for concrete. Polyvinyl acetate is characterized by flexibility, stability towards light, transparency to ultraviolet rays, high electric strength, toughness, and hardness. The higher the degree of polymerization, the higher the softening temperature.
Polyvinyl chloride (PVC)
A thermoplastic resin derived from the polymerization of vinyl chloride. Plasticizers have been added to give it flexibility. Widely used in piping products, it is also used for siding, floor covering, window housing, and fencing. In roofing, it is used for membranes and flashing. Also used in the manufacture of nonmetallic waterstops for concrete.
Ponding
(1) The process of flooding the surface of a concrete slab by using temporary dams around the perimeter in order to satisfactorily cure the concrete. (2) The accumulation of water at low points in a roof. The low points may be produced or increased by structural deflection.
Poplar
A member of the willow family. Its wood is used in furniture core stock, crates, and plywood. In North America: Populus tretnula, aspen, P. balsamifera, cottonwood, P. tacamahaca, and balsam poplar.
Porcelain
A hard glazed or unglazed ceramic used for electrical, chemical, mechanical, or thermal components.
Porcelain enamel
A silicate glass bonded to metal by fusion at a temperature above 427 degrees (C). Porcelain enamel is not a true porcelain.
Porcelain tile
A dense, usually impervious, fine-grained, smooth-surfaced, ceramic mosaic tile or paver.
Porch
A structure attached to a building, usually roofed and open-sided, and often at the entrance. Sometimes screened or glass-enclosed.
Porosity
The ratio, usually expressed as a percentage, of the volume of voids in a material to the total volume of the material, including the voids.
Portal frame
A series of rigid load bearing wall and roof members that form the basis of a structure. Usually manufactured from steel but can also be timber.
Portico
(1) A covered walk consisting of a roof supported on columns. (2) A colonnaded (continuous row of columns) porch.
Portland cement
See cement, Portland
Position
(1) A trader's open contracts in the futures market. (2) A reference to a shipping period, as in "Feb/March position."
Position indicator
A device that shows the position of an elevator in its hoistway. Also called a hall position indicator if at a landing, or a cab position indicator if in the cab.
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