Fire cement vs heat-resistant silicone

dharmeshsb · Post by **dharmeshsb** » Wed Sep 13, 2023 12:16 pm

Hello,

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I have a gap between the register/closure plate and flue pipe (please see pics). I'm worried that this is a source of heat loss from the fireplace and flat. The stove is a wood-burning one and Snug 5 Eco.

Can anyone confirm if fire cement or heat-resistant silicone is best for sealing this?

I'm planning to use ******** heat-resistant sealant or ******** fire cement. Would like to know which one is better.

Thank you.

Regards,

DSB

toolbox · Post by **toolbox** » Fri Sep 15, 2023 1:36 pm

Traditional fire cement tends to crack out when used on metal to metal surfaces, because they expand and contract.
So flexible sealant would be better.

FJC compound might be a good solution.
Depends on how hot the flue pipe will get, FJC max temp 250C

https://www.bes.co.uk/flue-jointing-com ... -tub-9464/

You might need something else if it exceeds that.