This is an assessment of the Thatch Firewall Membrane System for use in thatched roofs. The system is for use on existing thatched roofs which cannot take the rigid Thatch Fireboard system. The system comprises Thatch Firewall Membrane (flexible fibre glass woven fabric coated both sides with organic aluminised polymer system) installed over rafters prior to installation of a traditional thatch roof covering. Thatchbatts® (noncombustible, resin bonded, mineral Rockwool slabs) are installed between the rafters and can be supported on the Thatchbatt® Wired Fixing System. A suitable vapour control layer (VCL) must be installed according to manufacturer's instructions and, if required, a pre-determined internal finish layer.
Valid until 5th January 2021