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Sheet metal question???

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First time poster.Building my first RMH to heat my garage.I am using full size fire brick for my J tube and want to insulate the heat riser.My question is,with 1.5 inches of insulation around the riser,would sheet metal be sufficient as a wrap to contain the insulation.Do I need to worry about sheet metal melting or .I was thinking about using roofing metal that is 29 gauge or something similar.As a last resort a 16 x16 clay flue liner is an option but quite spendy.Any thoughts would be helpful.
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Location: Southern alps, on the French side of the french /italian border 5000ft elevation
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Michael, sheet metal in that spot is perfect. Tho, i'd say get some galvanised, because of the rapid cooling of the gases, steam condensates a bit, and it might rust after a while. Tho everybody has used small barrels there, with no ill effect. So it takes time to rust.

Tho, 1.5 of insulation is a bit on the shy side. 2 would be better, assuming you're using perlite.
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