Rank: Super forum user 
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Can anyone recommend the best / recommended product to use to fill in gaps around a fire door frame and the wall.P-lease dont sat expanding foam. Obviously architraving will be eventually put in place but smoke could still travel through if theres no seal, therefore whats the best product - mastic or silicon which I am not a fan of, - the gaps are around 8 mm
SBH
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Rank: Super forum user 
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Rank: Super forum user
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Rank: Super forum user 
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Rank: Super forum user 
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I assume it is a solid brick / block wall, so I would use cement after all that what is holding the bricks/ blocks together. Sand / cement and a bit of water (not to wet a mix). Clamp a batten to the back edge so it does not fall out the back. Push it in with edge of trowel. Once it dries it will shrink a bit, so you may get a very fine crack between the wood frame and cement. You could step it back before it dries fully ( ie pointing like you see between bricks in a wall- so it forms a little triangle). Then when fully dry this will give you a small area to run a sealant bead down. However, if you will put architrave around the door frame which is a tight fit the fire would have to burn through half an inch of wood before getting to the very small crack. Either way the cement mix will fill most of it so you will use less sealant. Screw fix and others sell suitable fire-retardant sealants. Chris
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 1 user thanked chris42 for this useful post.
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Rank: New forum user
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If gap is 8mm each side - 6mm Supalux would suit (each side) backed with fire retardant sealant.
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Rank: Super forum user 
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Cement or wet plaster along the lines of Chris42.
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Rank: Super forum user
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Cavity fire barrier Tested to BS 476 Part 20?
This is what would be required on a timber built structure at todays standard.
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Rank: Super forum user
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Cavity barriers are not sold at such a narrow depth - they are designed and system tested (BS 476-20) for the gap between inner and outer wall as a compression fit as the two parts are constructed (so not pushed in to the gap afterwards)
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Rank: Super forum user
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Cavity barriers are not sold at such a narrow depth - they are designed and system tested (BS 476-20) for the gap between inner and outer wall as a compression fit as the two parts are constructed (so not pushed in to the gap afterwards)
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Rank: Forum user
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What is the problem with Blue 60?
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