isshown below in figure 8.The decking shown has an additional soffit sheet. The decking sheet is suitablysupported on steel beams. On the top of decking a felt vapor barrier is bonded with bitumen. Over it, fiber board or expanded polystyrene is bonded, for insulation. This is then covered with two or three layers of felt roofing. Finally, the top surface is finished with a layer of white stone chipping spread on bitumen to provide for solar reflectivity and reduce heat absorption. 
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Light Weight Flat Roof
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Building Components And Types Lesson 19 : Roof And Roof Coverings
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Last modified: Saturday, 21 April 2012, 6:18 AM