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    • CommentAuthorhowdytom
    • CommentTimeOct 29th 2008
    My son has just come home with a test tube full of a white powder, when wetted it expands rapidly 3-4times in volume into a soft loose (air filled ?) product they call snow ( no I'm not naive, its definitely not a drug) It got me thinking about cavity insulants.

    Using polystyrene beads or foams are the norm for cavity fill, but are there any natural products that could be used IE mica, loose cork, expanded vermiculite, chopped wool fiber.... Has anyone good or bad experiences, R or U values or better natural/green alternatives.

    • CommentAuthortony
    • CommentTimeOct 29th 2008
    One cant use organic insulants in a cavity wallas they may rot, I have used vermiculite and got away with it but would not do it again.
    • CommentAuthorvisitor
    • CommentTimeOct 30th 2008
    As I am embarking on a renovation project myself I have been researching natural insulation. I'd like to ask what people think about the various natural insulations out there. I am considering the natural wool insulation Thermafleece (0.039 W/mK) which is supposed to be mold/moth treated (Technical details @ manufacturer Second Nature Uk) and the recycled newspaper insulation Warmcel (0.036 W/mK) (made by Excel Fibre) which seems to be attractive because can be damp sprayed and I think might be better option if I aim at passive house properties. Comments please.
    • CommentAuthorhowdytom
    • CommentTimeNov 1st 2008
    What about volcanic pumice ?
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