EW808A Thatch Firewall Membrane System
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 April 2021
Please Note: Every care was taken to ensure the information was correct at the time of publication. Any written guidance provided does not replace the user’s professional judgement. It is the responsibility of the dutyholder or person carrying out the work to ensure compliance with relevant Building Regulations or applicable technical standards.