I noticed that in my newly purchased mansion ( :-) ) there is nothing
between the floorboards and the ground except air. As there is crawling
space under the house, I thought it must be possible to insulate the
house from underneath. What materials would you expert DIYers recommend?
What would it cost?
Either use celotex, or suspend netting below and stuff with rockwool. You
must pay attention to how you expect to keep the joists from rotting. To
stop them rotting, the joists must either be kept warm, or strongly
ventilated. You are not allowed to get them cold and wet, or you'll get rot.
Pay particular attention to air bricks. Don't block any of them up until you
have decided what strategy you are using to make them unnecessary.
Draughts can be eliminated by affixing hardboard from underneath. This may
be all you need. Heat rises, so conductive losses (as opposed to convective
cold draughts) through floors are rarely great.
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