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SS Flex liner make noise sometimes

Post in 'The Hearth Room - Wood Stoves and Fireplaces' started by paulgp602, Jan 16, 2006.

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  1. paulgp602

    paulgp602 Member

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    For those of you with flex liners, do you notice that sometimes the liner makes dull "thud" sound? I noticed today (really cold out) that I hear 1 dull bang/thud from in the chimney. The stove has been going all weekend. I have a brick chimney with clay flue with the SS liner inside that. My stove store said that this is normal as the flex liner tends to expand when heated and cooled. What do you guys think?

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  2. Willhound

    Willhound Feeling the Heat

    Joined:
    Nov 20, 2005
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    I described a similar situation in a thread a while ago. My liner is rigid, but with about a 5 foot piece of flex for a connector and to route up past the ash shelf. I don't know if my noise is the liner, or the outer shroud on my insert.
    First few times it happened I just about jumped out of my chair. Seems to happen when I have a good long hot burn, and then let things cool off.
    A muffled bang or whump sound?

    Willhound
  3. paulgp602

    paulgp602 Member

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    Yes, that describes it, a muffled bang. Im sure its ok, I mean even if the flex liner came off the stove connector (it is screwed on but still...) it is still a clay flue with brick chimney fireplace, which was designed for fires anyway... Thanks for the reply.
  4. Willhound

    Willhound Feeling the Heat

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    Yeah, but is there not a flashing or block off plate at the top of the chimney? If your connector pops off I think you'd know it pretty quick by the smoke backing up into the room.
  5. paulgp602

    paulgp602 Member

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    Yes, there is a block off plate- I forgot about that! The installers screwed the liner to the elbow, then the elbow to the stove. My stove had pre drilled holes to attach the flange to the stove with these 3 metal ear type pieces.
  6. Rhone

    Rhone Minister of Fire

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    My install sounds just like Willhounds. I have a piece of about 5' flex liner that connects my insert to my solid SS liner (since m chimney has an offset) that was installed in a masonary chimney inside my house. Mine doesn't make noise, until yesterday when I lit a fire I heard something clink down the solid liner, then work its way down the flex pipe, and it must be on top of my baffle now. I wonder what it is/was? Maybe a flaky piece of creosote (or ice!?). I hope it wasn't Santa (just joking). But, that thing falling down caused concerns with my wife and I.
  7. Eric Johnson

    Eric Johnson Mod Emeritus

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    Probably just a chunk of creosote. Or maybe a meteorite.

    My old ss flex liner inside an unlined masonry chimney used to sound like rain on a sheet metal roof when it got good and hot.
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