| 摘要 |
<p>Panels made of insulating material, for the upper side of a roof structure, are in monolithic form, aligned across the length of rafters and interlock with side tongues and grooves. On its upper side each panel has an upward- protruding ridge, at an interval from the top edge and bottom edge, aligned along its length. Top and bottom edges may be blunt, and the ridge may protrude more pronounced towards the top edge than towards the bottom edge. There can be a lengthways recess on the underside.</p> |
