| 摘要 |
A metal building roof structure includes a plurality of purlins in a parallel arrangement in which the purlins have a generally vertical leg and a generally horizontal top leg. An insulation support sheet depends from the horizontal legs of adjacent purlins, and a purlin cap, having a horizontal top portion, is positioned on top of the horizontal top leg of the purlin. The purlin cap also has two generally vertical portions extending downwardly from the horizontal top portion and is placed over the insulation support sheet so that the two vertical portions of the purlin cap cause the insulation support sheet to substantially conform to the shape of the vertical leg of the purlin, thereby defining an insulation area having deep corners to enable the full thickness of the insulation material to be used.
|
