How can the gaps between the head of a block work wall and a tiled or slated pitched roof be sealed to prevent fire spread to the adjacent property?
There are two paths which require sealing to maintain the fire compartmentation at this junction – between the masonry wall and the underside of the roofing felt and within the timber batten void, between the felt and the tiles/slates. 300mm wide strips of 30mm thick Rockwool RWA45 can be used in both instances. Provided the masonry wall width is at least 250mm and the insulation is inserted under at least 10% compression, the 60-minute requirement of Building Regulations will be met.
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