Download Building Materials and Roofing Terms and more Quizzes Introduction to Business Management in PDF only on Docsity! TERM 1 corrugated metal DEFINITION 1 Corrugated galvanised iron, commonly abbreviated CGI) is a building material composed of sheets of hot-dip galvanised mild steel, cold-rolled to produce a linear corrugated pattern in them. TERM 2 dew point DEFINITION 2 The dew point is the temperature below which the water vapor in a volume of humid air at a given constant barometric pressure will condense into liquid water at the same rate at which it evaporates. TERM 3 downspout DEFINITION 3 A downspout, waterspout, downpipe, drain spout, roof drain pipe, leader or rone is a vertical pipe for carrying rainwater from a rain gutter to ground level. TERM 4 gravel stop DEFINITION 4 A gravel stop is a sheet metal fabrication used at the perimeter of built up roofing. TERM 5 gypsum DEFINITION 5 Plaster is a building material used for coating walls and ceilings. Plaster starts as a dry powder similar to mortar or cement and like those materials it is mixed with water to form a paste which liberates heat and then hardens. TERM 6 membrane DEFINITION 6 A membrane is a thin, film-like structure that separates two fluids. It acts as a selective barrier, allowing some particles or chemicals to pass through, but not others. TERM 7 parapet DEFINITION 7 A parapet is a barrier which is an extension of the wall at the edge of a roof, terrace, balcony, or other structure. TERM 8 purlin DEFINITION 8 In architecture, structural engineering or building, a purlin is any longitudinal, horizontal, structural member in a roof except a type of framing with what is called a crown plate. TERM 9 reglet DEFINITION 9 A reglet is a piece of wooden spacing material used in typesetting, usually to provide spacing between paragraphs, though it is sometimes used to fill in small spaces not taken up by type in the chase. TERM 10 R-factor DEFINITION 10 The R-value is a measure of thermal resistance used in the building and construction industry. Under uniform conditions it is the ratio of the temperature difference across an insulator and the heat flux through it or .
