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Test_2_Key_Cncepts - CMP 210 Fall 2008 Key Terms and...

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CMP 210 Fall, 2008 Key Terms and Concepts from the Text Test 2 Chapter 14 Cement Fiber (fiber cement) – made from portland cement, sand and wood fibers. Its is a non-combustible material and is not prone to decay like wood, plywood, or hardboard. It is a horizontal siding material is almost rectangular in profile, it is available in 6-in to 12in widths and 3/8-inchs thick. Recommend an overlap of 1-1/4in and provide trims for use at corners and around openings to match the siding. Drainage layer – air space between the siding and the sheathing. This space provides a layer for any water that may infiltrate behind the siding, particularly under windy conditions. This space between the siding and the sheathing also helps to dry the siding faster and is important consideration for wood siding, which is decay prone. Drywall Interior – Screws are preferred installation because they hold much better then nails. The boards may be fastened either horizontally or vertically, and have to be fastened to every framing member. Multiple – Even though one layer in the norm, sometimes more then one layer is required so that the fire resistance can be higher Fire resistance of WLF assemblies – wall or ceiling-floor assembly depends on the type of drywall panels. Generally, one 5/8-in, thick, type X drywall panels in each side of a wood stud wall gives a 1 hr fire resistance rating. Two layers gives a 2 hr, and three gives a 3 hr fire resistance. However, the fire-resistance rating also depends on the spacing of the studs, spacing, nails or screws, and if the cavity walls were insulated. Fire resistance design manual gives the specifications and sketches the use of 1,2,3 hr rated assemblies. Because the ratings are in integer hours, an assembly whose measured fire rating is 1hr means that the material can withstand fire between 1hr and 1hr59min and so on. Gypsum board panels – (most commonly used interior wall and ceiling covering finish in all types of buildings. It provides a strong, fire-protective cover over faming members, and can be finished with paint, wallpaper, ect. The water content in gypsum board is what makes the material fire-protective.) Sizes: Most Common: 4 X 8ft Other Sizes: 4 X 9ft, 4 X 10Ft, 4 X 12 Ft Thickness in residential: 1/2 in Thickness in Commercial: 5/8 in Types of Gypsum Board Panels Type R board (regular): Are the standard board, typically used in ½ in thickness Type X board: Are most fire-resistive then R-board, the core in type X-board contains noncombustible fibers mixed with gypsum. The Fibers provide greater strength so that the boards, is subject to fire, maintain structural integrity for a longer time than type R boards. -5/8in Board gives 1 hr fire resistance, a board this thick that doesn’t give a 1 hr resistance is not a X board. ½ in board gives 45min fire resistance.
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