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ROOFING TERMINOLOGY Our short list might help you understand some of the words in your proposal so you will feel more comfortable about calling our office to discuss the scope of work or ask questions. BUILT-UP ROOFING: layers of roofing consisting of a base sheet and multiple layers of asphalt and plysheets, with capsheet or gravel as a finishing surface. Commonly used on flat or low-sloped roofs ("Tar and gravel") CAP SHEET: a granulated coated surface commonly use as top ply of a built-up roofing system. CLASS "A": the highest of fire-resistant ratings - composition shingles are Class "A". CLASS "B" AND CLASS "C": fire-resistant ratings for cedar shakes, indicating that materials are able to withstand exposure to a fire originating from sources outside the building. COUNTER FLASHING: metal flashing used to cover and protect the upper edge of a base flashing. CRICKET: a peaked saddle constructed to deflect water, commonly around a chimney. DECK/SHEATHING: the base surface to which other roofing materials are applied. DRIP EDGE: an L-shaped metal strip installed along the edges of the roof to keep water from running back under the deck and eaves. EAVE: the lower edge of the roof that overhangs the wall. EXPOSURE: the portion of the finish roofing materials that is exposed to the weather.Cedar shakes are commonly "laid with 10" exposure" FELT: a commonly used underlayment made of matted fibers that is saturated with asphalt (used to be called "tar paper." ) It is used as a secondary layer of protection between the deck sheathing and the finish roofing material. FLASHINGS: material used to waterproof any intersection or projection in a roof.Most commonly refers to galvanized metal used around chimneys, vents, and valleys. OVERHANG: the part of the roof that extends beyond the exterior walls. PITCH: the steepness of the roof - the slope. RAKE: the outer edge of the roof from the eave to the ridge; the inclined edge of a roof over a wall. RIDGE: the top edge of two intersecting sloping roofs - the peak. SLOPE: the degree of roof incline. It is measured by the rise in inches for each 12 inches of horizontal run. A roof with a 4:12 slope rises 4 inches for every foot. SOFFIT: the finished underside of the overhang. SQUARE: the common measurement for roof area. 100 square feet (10 x 10) is one square of roof. STEP FLASHING: metal flashing used where a vertical surface meets a sloping roof. UNDERLAYMENT: most commonly is one or more layers of felt over which the finish roofing material is installed. |