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SBH  
#1 Posted : 10 January 2020 13:54:02(UTC)
Rank: Super forum user
SBH

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

Roundtuit  
#2 Posted : 10 January 2020 14:50:13(UTC)
Rank: Super forum user
Roundtuit

There are expanding style foams specifically designed for the application you are describing - 8mm is quite a gap to try and bridge with an off the shelf sealant.

Google has many answers

https://www.safelincs-forum.co.uk/topic/5916-space-between-fire-door-frame-and-opening/

https://ukfiremag.mdmpublishing.com/perimeter-sealing-around-fire-doors/

Otherwise you are looking for an intumescent mastic

Edited by user 10 January 2020 14:53:07(UTC)  | Reason: mastic

Roundtuit  
#3 Posted : 10 January 2020 14:50:13(UTC)
Rank: Super forum user
Roundtuit

There are expanding style foams specifically designed for the application you are describing - 8mm is quite a gap to try and bridge with an off the shelf sealant.

Google has many answers

https://www.safelincs-forum.co.uk/topic/5916-space-between-fire-door-frame-and-opening/

https://ukfiremag.mdmpublishing.com/perimeter-sealing-around-fire-doors/

Otherwise you are looking for an intumescent mastic

Edited by user 10 January 2020 14:53:07(UTC)  | Reason: mastic

Elfin Davy 09  
#4 Posted : 10 January 2020 15:12:30(UTC)
Rank: Super forum user
Elfin Davy 09

Plaster ?

chris42  
#5 Posted : 10 January 2020 15:38:44(UTC)
Rank: Super forum user
chris42

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

thanks 1 user thanked chris42 for this useful post.
SNS on 12/01/2020(UTC)
MrB-Dalton  
#6 Posted : 11 January 2020 13:36:14(UTC)
Rank: New forum user
MrB-Dalton

If gap is 8mm each side - 6mm Supalux would suit (each side) backed with fire retardant sealant. 

SNS  
#7 Posted : 12 January 2020 21:25:20(UTC)
Rank: Super forum user
SNS

Cement or wet plaster along the lines of Chris42.

toe  
#8 Posted : 12 January 2020 23:05:53(UTC)
Rank: Super forum user
toe

Cavity fire barrier Tested to BS 476 Part 20?

This is what would be required on a timber built structure at todays standard.

Roundtuit  
#9 Posted : 13 January 2020 12:37:27(UTC)
Rank: Super forum user
Roundtuit

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)

Roundtuit  
#10 Posted : 13 January 2020 12:37:27(UTC)
Rank: Super forum user
Roundtuit

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)

Dazzling Puddock  
#11 Posted : 14 January 2020 10:35:55(UTC)
Rank: Forum user
Dazzling Puddock

What is the problem with Blue 60?

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