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Summary: Building dictionary to explain building jargon and terminology from A - A.
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Building dictionary for the letter P - Page 16
Plumbing fixture
A receptacle in a plumbing system, other than a trap, in which water or wastes are collected or retained for use and ultimately discharged to drainage.
Plumbing system
Arrangements of pipes, fixtures, fittings, valves, and traps, in a building which supply water and remove liquid-borne wastes, including storm water.
Plume
(1) The effluent mixture of heated air and water vapor discharged from a cooling tower. (2) An identifiable and definable stream of pollutants in an otherwise clean volume of air or water.
Ply
(1) A single layer or sheet of veneer. (2) One complete layer of veneer in a sheet of plywood.
Plywood
A flat panel made up of a number of thin sheets (veneers), of wood. The grain direction of each ply, or layer, is at right angles to the one adjacent to it. The veneer sheets are united under pressure by a bonding agent. Interior-grade plywood is suitable for indoor use or for outside use when subject only to occasional, temporary moisture, while exterior-grade plywood uses a weather-resistant adhesive.
Plywood; form
See formwork plywood.
Plywood; marine
See marine plywood.
Pneumatic control system
A system in which control is effected by pressurized air.
Pneumatic drill
A reciprocating rock or masonry drill actuated by compressed air.
Pneumatic hammer
An air-powered reciprocating drill fitted with a chisel or hammer.
Pneumatic structure
A fabric envelope supported by an internal air pressure slightly above atmospheric pressure. The pressure is provided by a series of fans.
Pneumatically applied mortar
See shotcrete
Pockmarking
Undesirable depressions formed in a painted surface or varnish film.
Podium
(1) A stand for a speaker. (2) An elevated platform for a conductor. (3) The masonry platform on which a classical temple was built.
Point
(1) A fee equal to 1% of the principal amount of a loan. Charged by the lender when the loan is made. (2) A tooth for a saw. (3) A mason's tool. (4) A thin, triangular or diamond-shaped piece of metal used in glazing to hold glass in a wooden frame. (5) A piece of equipment that is monitored or controlled by a building automation system.
Point load
A term used in structural analysis to define a concentrated load on a structural member.
Point of support
A point on a member where part of its load is transferred to a support.
Pointing
(1) The finishing of joints in a masonry wall. (2) The material with which joints in masonry are finished.
Pointing trowel
A diamond-shaped trowel used in pointing or repointing masonry joints.
Poissons ratio
The ratio of transverse (lateral) strain to the corresponding axial (longitudinal) strain resulting from uniformly distributed axial stress below the proportional limit of the material. The ratio will average about 0.2 for concrete and 0.25 for most metals.
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