屋面选择# # #屋顶选择和建筑规范屋顶瓦片粘土和混凝土瓦屋顶可以安装在固态外壳或间隔在屋顶隔热板搭2.5/12或更大。屋顶的螺距小于4/12需要双重覆盖地毯衬(905.3.3.1);屋顶搭在4/12,更需要一层(905.3.3.2)。Tile-attachment方法随气候条件,坡屋顶,地毯衬系统,和瓷砖类型。咨询IRC部分905.3.7和适当的附件表905.3.7指导方法。闪光和盖泛水应提供在墙壁和垂直穿透。谷闪烁必须至少26-gauge“W”形象,G90镀锌铁皮和扩展11英寸两个方向从山谷的中心线(905.3.8)。板岩板覆盖着2006 IRC的905.6节。板必须安装有两个钉在坚固的护套至少4/12的屋顶(905.6.2),ASTM D 226, 1型地毯衬(905.6.3)下面。屋顶地区历史的冰筑坝必须有两层地毯衬粘合在一起或自,沥青膜从屋顶边缘延伸至24英寸超出了建筑的外墙线。 Head lap requirements vary with roof pitch and can be found in Table 905.6.5. The minimum standard for valley flashing is 15-inch, G90 galvanized steel of .0179-inch thickness (905.6.6). Asphalt roof shingles Asphalt shingles (Section 905) must be installed on solid sheathed roofs of at least 2/12 pitch with 12-gauge roofing nails long enough to go through the shingle and penetrate the roof deck 3/4 of an inch. Roofs under 4/12 pitch require two layers of underlayment; roofs 4/12 and steeper require one layer. Roof areas with a history of ice damming must have two layers of underlayment cemented together or a self-adhering, bituminous membrane extending from the roof edge to 24 inches…