the mortar between the bricks, blocks and stone may be degraded by heat and may display signs of weakening. concrete blocks may crack, but they usually retain most of their strength and basic structural ability. stones and concrete may lose small portions of their surface when heated, a condition called spalling. bricks rarely show any signs of loss of integrity or serious deterioration. masonry is minimally affected by fire and exposure to high temperatures. Brick and stone are generally used to create veneer walls, which are decorative covers for wood, metal, and concrete-block load-bearing walls. roof decks, walls, and subfloors are all commonly made of OSB masonry masonry includes bricks, stones and concrete blocks. this material has replaced plywood and planking in the majority of construction applications. oriented strand board (OSB) a wooden structural panel formed by gluing and compressing wood strands together under pressure. some of these products may be highly combustible, can produce significant toxic gases, or can rapidly deteriorate under fire conditions. such materials include plywood, particleboard, fiberboard, oriented strand board and paneling. Newer construction often contains composite building components and materials that are made of wood fibers, plastics and other substances joined by glue or resin binders. pressure treating wood also weakens the wood's load-carrying ability by as much as 25%. wood can be pressure treated with fire retardants to reduce the speed at which it ignites or burns however, they are not always totally effective in reducing fire spread. wood with a high moisture content (sometimes referred to as green wood) does not ignite as readily nor burn as fast as wood that has been kiln dried or dehydrated by exposure to air over long periods of time. The moisture content of wood affects the rate at which it burns. lumber of smaller dimensions needs to be protected by gypsum drywall or other insulation to increase its resistance to heat or fire. the smaller the dimensions of the wood, the easier it is to ignite and the faster it will lose its structural integrity. size and moisture content affect how wood reacts to fire conditions. TERMS IN THIS SET (110) common building materials wood, masonry, metals, reinforced concrete, gypsum, lath and plaster, glass/fiberglass, plastic, composite materials wood wood is the most common building material in North America and is the main component of a variety of structural assemblies.
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