我要在带有4:12音高的简单山墙屋顶上安装29 GA Classic Rib Steel面板。面板从峰值到2'悬垂的末端长12英尺9英寸。它们连接到2×4 purins上的底座和OSB护套。我在亚利桑那州中部。

经典肋骨面板的制造商安装指南说，每12英寸沿侧圈安装每12英寸的缝线螺钉，但是几家经典肋骨的主要零售商的指南说，针迹螺钉是可选的，其音高是4:12或更大的音高。They all agree that butyl tape along the side laps is not necessary, as the Classic Rib has an anti-siphoning groove built in. I finally decided to follow the manufacturer’s recommendation, but when I installed the first few stitch screws, they pulled the upper panel’s steel up all the way to the screw’s washer before starting to penetrate the lower panel so that, as the screw penetrated the lower panel, the washer became greatly overcompressed. I ended up having the back the screws out over and over again to get them finally to penetrate the lower panel and seat properly.

我使用的是强烈推荐的螺旋枪，Dewalt DW-268，我认为我正在施加正确的压力。The same problem was occurring on roughly 20% of the wood screws I was installing on the flats, into the purlins, until I stacked the next seven panels and predrilled 3/16″ holes for them, just barely larger than the screw’s diameter, which made everything much easier, neater, and quicker. If I’m going to install any more stitch screws, I’ll predrill holes for the upper panel’s overlapping rib and leave the lower panel to be drilled by the screw itself.

即使将上面板倾斜消除了在驱动器下将面板分隔的螺钉的问题，我也想知道针脚螺钉是否是个好主意。First of all, fewer holes in the steel seems better, and secondly, as Malcolm pointed out in another, otherwise unrelated discussion, 29 ga steel alone doesn’t seem as if it would hold a screw all that securely, especially as the panels move around with wind and thermal expansion and contraction. The screws in the flats immediately on each side of the overlapping ribs between panels seem to hold the overlap quite securely.

您是否在我的应用中使用针螺钉？您的评论将帮助我决定，如果我决定省略针体螺钉，请为建筑检查员的批准提供理由。