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How to elevate a fireplace insert and hold it far enough from a wooden floor

 
pollinator
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I have a cast iron fireplace insert that I want to use in my cabin as a regular stove.  How do j get it off the floor enough to keep from burning the floor?  Right now it is just plywood, do I put tile down and then use firebrick to elevate it off the tile?  

Also I have a metal roof, how do I seal it once I put chimney pipe through it?  

Thanks
 
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Not familiar with fireplace inserts so I can't comment on that, but is it heavy?  I just want to make sure you've considered whether the floor under your insert has the structural support to hold it (plus a stack of firebrick or whatever you decide to use)  up without sagging or damage.

In our cabin in Alaska we always used old face-down metal highway signs on the floor under our wood stoves, but the stoves all had cast iron feet so it was more a thermal-reflection thing to prevent thermal radiation from a cherry-red barrel stove from lighting the wooden floor on fire or -- more plausibly -- charring it.

As for your roof, the typical thing is to run the stovepipe through a manufactured collar unit that has flashing (to mesh with your metal roofing and keep water out) and a couple of layers of metal with insulation between them to keep your stovepipe from lighting the roof on fire when it (your stovepipe) gets cherry red or melts during a chimney fire.  I'm not sure how to improvise that if you don't want to use the manufactured unit.  A lot of primitive cabins just run the stovepipe up through the hole and then chink the gap with stuffed fiberglass insulation -- but a lot of primitive cabins burn down the first time there's a chimney fire, too, so I don't recommend that.
 
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