Sheet comprising an anti-perforation protection cap for a device for holding multiple layers for waterproof insulating roofing

摘要

Before the waterproof layer or topping 5 is laid, there is placed, over the head 9a of each screw 9, a cap 16 which is integral with each plate 6 so that, even when the insulating layer 4 is deformed, for any reason, the head 9a of the screw 9 cannot damage the waterproof layer or topping 5. <IMAGE>