Insulating a Roundhouse Floor | Permaculture Magazine

Insulating a Roundhouse Floor | Permaculture Magazine

... a fairly new product called Foamglas that is made by forcing air through molten recycled glass to form a very light, pumice-like material that does not wick water and is very good insulation. It looks to me as if it will bear weight well too, so as an experiment we have put down a layer of 20cm (8in) of the stuff around our outer circle, without a membrane, and floated wooden joists onto it, then screwed planks specially cut to a taper by Adrian and his mill up the track.