What’s a good way to support a freestanding chimney

chimneyyurt

I'm working on adding a woodstove to a yurt. The chimney will go out a sidewall and then head up. There is not a good way to brace the chimney to the yurt itself.

Here are some options I've read about, but don't know how to judge:

  • Use a pair of 4"x4" treated posts. Bed them in the ground in concrete. This is what the yurt manufacturer recommends:
    enter image description here

  • Build a wooden frame to support the chimney. Pairs of 2"x6"s joined in L-shapes as the corner. Attached to a poured concrete footing w/ 2"x6" treated "sill plates". Could be covered with sheathing & siding.

  • Build a masonry column to support the chimney, like this:

enter image description here

  • Put a metal pole in the ground, strap the chimney to it. Not sure what kind of pole, or size. Here are some pictures of this:

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Any other suggestions?

Best Answer

My first inclination would be to install a concrete footing 3 or 4 feet deep by maybe 1 1/2 to 2 feet square. Put a concrete block or paver in the bottom of the hole to support the pipe. Plumb the pipe (2 or 3 inch galv should work well) with some temp 2X4 braces, then pour concrete into your hole. Be sure to crown the top of the footing a little so water will drain off and not pool around the pipe. The reason I like a large footing is to supply good ballast and avoid any frost heaves.(if you get ground freeze in WA.) Also, don't forget to put a cap on the top of the pipe so water will not fill the pipe. You may also want to paint the pipe with Rustoleum before attaching the stainless straps to the flue. This will help avoid any reaction from dislike metals in contact with each other.

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