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Chimney liner, joining different materials

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  • 29-09-2010 11:14am
    #1
    sas
    Registered Users Posts: 1,282 ✭✭✭


    Hi,

    Really need any thoughts\help on this one.

    In order to accomadate a metal chimney valve in a chimney flue (passive house detail that I've no choice with) , I need to join a concrete cap and a regular flue liner.

    I've been advised that because they are 2 different materials with 2 different expansion\contraction rates, that any rigid seal created (e.g. using fire cement) won't last very long once the stove is in use.

    I have a fall back position which is to use a metal flue for the remaining 2 m of my chimney but due to their appallingly poor life span I am very reluctant to go that route.

    Is there any material reasonably available here for sealing joints in a flue that stays flexible?

    Any thoughts at all appreciated. This one really has me caught.

    SAS


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    #2
    AckwelFoley
    Registered Users Posts: 12,556 ✭✭✭✭AckwelFoley


    There is a "flue seal" that you can buy in a silicone type aplicator tube, as i recall the sealant itself is a redish colour

    edit: this is what i was referring to but it states its for use on non porus substrates, which rules out the regular flue :/


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