Description

The Fix Top coach screw fixes the Rockciel boards as part of external roof insulation using the sarking method. Its double thread allows it to pass through the thickness of insulation without compressing it: the first thread bites into the counter batten or the roof covering support, the second into the roof structure, and the differential pitch holds the timbers apart while keeping the nominal thickness of the stone wool. Six lengths are listed, from 230 mm to 480 mm, each packed in boxes of fifty, which allows the fixing to be matched to the thickness of insulation chosen. ROCKWOOL highlights quick installation and packaging optimised for site use. The length is chosen according to the thickness of Rockciel installed and the section of the timbers passed through.