suitable materials for filling gap around flue

[Barry98]

Might give it a whirl save carrying ready mix and time mixing

 

[neily01]

i posted fire cement 5 days ago, not a word on it. dannypipe mentions it and its a great idea! dans well stole my thunder!! lol

 

[Barry98]

Apologise fella I didn't see it

 

[Dannypipe]

Well sooooooooorry!! LOL! 😉

 

[ambrosia]

you used to get a strip of silver tape with a new flue which you were suposed to wrap around the flue to protect it from the concrete.
manufactures seem to have stopped supplying it these days

I rang gas safe on this issue, got some grumpy guy who didnt want to answer any questions or be helpful at all. however i did manage to get out of him before i was told to go away that sand and cement was the only suitable material

thanks for all you replies and I think i'll be ncs all those sealed with expanding foam seals i see on landlord inspections

 

[Dannypipe]

Most flues are stove enamelled, or painted. I think the tape you mention is for telescopic flues but I could be mistaken. You still get a strip of tape with a lot of them.

 

[kozak1968]

Silicon mastic does the job. Valliant say a suitable sealant. The outer flue is low temperature on condensing boilers so i personnally think this is o.k but somebody will prove me wrong......

 

[AWheating]

Silicon mastic does the job. Valliant say a suitable sealant. The outer flue is low temperature on condensing boilers so i personnally think this is o.k but somebody will prove me wrong......

as with any hole made through an internal or external wall it must be sealed with a material that keeps the specific fire rating of the wall, if the walls fire rating matches the mastic being used then it should be fine.

 

[TBServices]

I've used high temp silicone, but usually sand and cement. Only problem is after a while it can crack on small holes, seen loads that have done it. Might try the fire cement trick.


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