Hello, I'm struggling to find any approved guidance for installation of cavity trays above the roof of an extension. Forums mention remove three bricks at a time, fit tray, pack and point brickwork then on to the next three - but then the weight is not uniformly distributed over the area of the entire brick, just the packer. Plus I thought slate packing was a no-no with most BCOs nowadays?
The best way I can think of would be to do in two phases - remove every other three bricks over the span, fit the trays and ram in the mortar. Allow a few days to go off and then do the rest. But to be confident of a full bed to spread the load from above, how can you confidently pack the joint without any snots getting into the cavity? Also none of the literature I've seen from the companies who sell the preformed trays show insulated cavities, any issue here?
Cheers,
Craig
The best way I can think of would be to do in two phases - remove every other three bricks over the span, fit the trays and ram in the mortar. Allow a few days to go off and then do the rest. But to be confident of a full bed to spread the load from above, how can you confidently pack the joint without any snots getting into the cavity? Also none of the literature I've seen from the companies who sell the preformed trays show insulated cavities, any issue here?
Cheers,
Craig