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Term Definition
Porcelain. Ceramic china-like coating applied to steel or cast iron surfaces; when used as a finish for metal fixtures it is called vitreous enamel.  
Porch. 1. An ornamental entrance way to a house. 2. A landing before a door.  
Pores. Openings on the surface of a piece of wood; these openings result when vessels in the wood are severed during sawing; see also Vessels.  
Porosity. 1. Being permeable to liquids. 2. Degree of integrity or continuity. 3. Gas pockets or voids in metal. 4. The ratio of the volume of voids in the material to the total volume of the material, including the voids, usually expressed as a percentage.  
Porous Fill. soil that allows relatively free passage of water.  
Porous Woods. Hardwoods having vessels or pores large enough to be seen readily without magnification.  
Porphyry. A hard igneous rock quarried in ancient Egypt, composed of crystals of white or red feldspar in a red matrix.  
Portable Bleacher. An uncovered stand of tiered planks that can be moved from one event to another.  
Portable Stage. A movable raised platform usually used for entertainment and speaking purposes.  
Portal Frame. A rigid frame; two columns and a beam attached with moment connections.  
Portal. An elaborate or imposing door or entrance.  
Portcullis. A strong heavy grating of iron or iron-bound wood sliding up and down in vertical grooves to block a gateway in a fortress.  
Porte Cochere. A roofed structure adjacent to a building entrance covering a driveway, to allow shelter to automobile passengers.  
Portico. A roofed colonnade adjoining a building  
Portland Blast Furnace Slag Cement. The product obtained by intimately ingrinding or intimately and uniformly blending a mixture of granulated blast furnace slag and portland cement clinker.  
Portland Cement Association (PCA). 5204 Old Orchard Road, Skokie, Illinois 60077, (708) 966-6200.  
Portland Cement Grout. Portland cement added to fine aggregates and water and pumped or forced into joints, cracks, and spaces as an adhesive sealer or structural fill.  
Portland Cement Mortar. Mortar where the cementing agent is portland cement.  
Portland Cement Plaster. A binder of portland cement mixed with plaster and used on exterior surfaces or in damp areas.  
Portland Cement. A hydraulic cement produced by pulverizing clinker consisting essentially of hydraulic calcium silicates, and usually containing one or more of the forms of calcium sulfate as an interground addition; the most common type of cement used in construction; the name portland is not a brand name, it refers to a type of cement.  
Portland Cement. Product obtained by pulverizing and mixing limestone with other products to produce cement required for concrete mix.  
Portland Cement-Lime Plaster. Portland cement and lime (either Type S hydrated lime or properly aged lime putty) combined in suitable proportions.  
Portland Pozzolan Cement. The product obtained by intimately intergrinding a mixture of portland cement clinker and pozzolan, or an intimate and uniform blend of portland cement and fine pozzolan.  
Positioned Weld. A weld made in a joint which has been so placed as to facilitate making the weld.  
Positioner. Wire device designed to hold reinforcing steel in designated position in a masonry wall.  
Positive Drainage. In roof construction, the drainage condition in which consideration has been made for all loading deflections of the deck and additional roof slope has been provided to ensure complete drainage of the roof area within 24 hours of rainfall precipitation.  
Positive Moment. A result of bending moment in a beam in which the upper part is in compression and the lower part is in tension; compare with Negative Moment.  
Positive Pressure. 1. Condition that exists when more air is supplied to a space than is exhausted, so the air pressure within that space is greater than that in surrounding areas. 2. A pressure within the sanitary drainage or vent piping system that is greater than atmospheric pressure; also called Plus Pressure.  
Post Cap. 1. A metal connection from a wooden post to a girder. 2. A prefabricated fitting which tops a wooden post and protects it from the elements.  
Post Hole. A dug out hole in the ground for the installation of a fence or gate post.  

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