gunite for underfit?

Chris Holley

I doing a retrofit underfit rfh job on the first floor of an old farmhouse in maine. Heat loss calcs indicate about 25btu /sq ft. Floors are 2+" of old dry pine so we're stretching here. I'll probably figure in some supplemental hi-temp baseboard for cold days.

Floor joist spacing varies greatly. There's a skilled shotcrete contractor in the area and I've been toying with stapling up poly sheets in the joistbays, installing the tubing, and shooting on 1" to 1.5" of gunite (aka shotcrete). May also need some wire mesh..

Anyone here had any experience using gunite as an underfit thermal mass?

Chris Holley

Paul Pollets

why not buy the correct lightweight product from either Hacker, US Gypsum or GypCrete and mix in the gunnite hopper? Remember that Gypspan flashes in 20 min or less. If you wait too long, the mess it makes will boggle the mind.

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