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Cracked chimney flue - Forno Bravo Forum: The Wood-Fired Oven Community



New Forno Bravo Forum Feature

Forno Bravo Forum Community,

You will notice a new forum at the top of the main page called, "Ask Me Anything". This forum will be used for live one hour "Ask Me Anything" (AMA) sessions hosted by people who are knowledgeable in different areas pertaining to wood fired ovens. How it works:
- Each AMA will have a "sticky" thread where the community can post questions they would like answered during the live session. This will allow everyone to participate even if you can't be online for the live session. These questions will not be answered by the host until the live AMA; if you need an answer quickly, you should post it in the appropriate Forum area for the community to respond.
- Another thread will be posted for the live AMA. Registered users who are logged in during the live session can interact with the host by asking questions and receiving responses.
- The live thread will remain in the AMA forum to view after the session.

To kick off our AMA feature, we have invited author, chef and master bread maker and host of Pizza Quest, Peter Reinhart, to be our first host! Peter will be in the Forum on Monday, February 15th, from 7:00 - 8:00 pm EST. If you are unable to be online during the live session, you can post your questions in the sticky post. Peter will answer those questions during the live session on February 15th. You can view Peter's answers to your questions as well as what happened during the live session in the session thread.

We hope you enjoy this new feature! Please let us know if there is a topic that you'd like to have as an AMA and we'll look for a host!

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Cracked chimney flue

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  • Cracked chimney flue

    After a long winter, I'm back at it. I took the tarp off to inspect the oven. It seemed fine, but when putting the tarp on, noted that the clay chimney flue liner moved a tiny bit.

    I had used a previously described method to make a tapered flue (see photo).

    Used HeatStop for to bond the flue. I also set it into a bed of heatstop to set onto the arch. Seemed fine the few times I've used it. I thought I'd repair before moving on. The flue could easily be lifted off. The heat stop crumbled away, which it hadn't done for all the dome (rock hard). As I took it off, the flue separated in two pieces. Seems the mortar didn't bond with the clay.

    Should I pursue a different vent system? Any reason the mortar shouldn't bond with the clay flue liner? Anyone else have problems? If your chimney is built and the flue liner covered, you may not know it's cracked I suppose.
    Mike - Saginaw, MI

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  • #2
    Re: Cracked chimney flue

    Mike - we both went a similar route on the vent. I haven't noticed a problem with mine, but then again, its covered. After I covered my vent pipe with decorative brick, I filled the gap in with portland/vermiculite. That may be the reason I am not seeing any separation.

    Good luck!

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