Outer insulation.

Phil Grady

Posts: 182

Location: mid Ohio, 40.318626 -83.766931

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posted 7 years ago

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A question for those that have built there RMH along an outside wall of there building.

Did you put insulation between the RMH and the outside wall, if so what did you use.?

thomas rubino

master rocket scientist

Posts: 6931

Location: latitude 47 N.W. montana zone 6A

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posted 7 years ago

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Hi Phil; I used hardy board on the back side of my mass and left a 4" space to the outside wall ( stone) then filled with perlite.

For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
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