| 摘要 |
<p>A support web (10) comprising a metal (alloy) forms plastic deformable support, lateral and edge regions of the strip. The web is pleated in the strip length direction so that hills and valleys extend in the web cross direction. The support web has a central support region extending the entire length of the strip for placing on top of the ridge beam. Ventilation holes are provided in the lateral regions on either side of the support region. Pleated edge regions adjoin the lateral regions.</p> |
