Cavity Stop Sock

Flamstop is designed to prevent fire penetration, aid the
reduction of sound transmission and help maintain the
thermal integrity of the insulation requirements under
Approved Document L1A FOR England and Wales
October 2010 through wall cavity in both masonry
/ block and brick / timber frame & steel cavity wall
structures. The product is used around all apertures as
well as at party wall junctions and floor levels in all
cavities