![]() ![]() One side has a slip resistant coating and should be placed facing up. OSB: Oriented strand board (OSB) is cheaper than plywood, but not as strong as plywood, and does not hold nails as well as plywood.The thickness of plywood depends on the spacing of the rafters. Use only exterior grade plywood for decking. ![]() It comes in many grades with ratings from A to D. Plywood: Plywood is strong, durable, and light.There are four main types of decking commonly used on residential roofing projects: Most new homes have decking made of plywood. It is the structural “skin” of a roof over which roofing in applied. The surface installed over the supporting framing members of a building. ![]() Also called a pipe boot.Ĭounter flashing: That portion of the flashing attached to a vertical surface to prevent water from migrating behind the base flashing.Ĭricket: A peaked saddle construction at the back of a chimney to prevent accumulation of snow and ice and to deflect water around the chimney.ĭeck: Also known as Decking. Indicates roofing is able to withstand severe exposure to fire originating from sources outside the building.Ĭlass “B”: Fire-resistance rating that indicates roofing materials are able to withstand moderate exposure to fire originating from sources outside the building.Ĭlass “C”: Fire-resistance rating that indicates roofing materials are able to withstand light exposure to fire originating from sources outside the building.Ĭollar/Boot: Pre-formed flange placed over a vent pipe to seal the roof around the vent pipe opening. Used for alignment purposes.Ĭlass “A”: The highest fire-resistance rating for roofing. Battens or purlins are attached to roof decking to give a secure base to anchor the roofing materials to because many OSB (chip board sheets appearing much like plywood) will not hold a screws properly.Ĭaulk: To fill a joint with mastic or asphalt cement to prevent leaks.Ĭhalk line: A line made on the roof by snapping a taut string or cord dusted with chalk. Sometimes called “hat channel” because of its shape. In some instances they are also steel lengths measuring about an inch or so wide that have an elevated middle where one screws the metal roofing into. Batten or Purlins can be 1″x2″x4′ wood strips nailed to the roof or rafters, upon which the roofing is attached. Batten: Also referred to as Purlins, see Purlin or Purloin. ![]()
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