You have a MAJOR problem. I know this is UK.DIY but I
think you need expert advice urgently.
To original poster: It is a very bad idea to do anything that might
compromise underfloor ventilation or damp-proofing. You run the risk
of getting dry rot. If you are raising boards, take a good look
underneath. Check for damp, bad smells, beetle, rot, mice, etc.
Remove rubbish (in case it bridges the DPC). Clear all airbricks.
It will be a good opportunity to have a look down there so we'll make
a decision when we get to it. Thanks
PS. When did google groups get so smart that it will link a new
thread with an old one with the same subject? I'm sure it hasnt
always done it.
Been doing it as long as I've been using it (which is a few years). And
dontcha just love those See rest of message (1 line) links <grrr>. But what
I really like is when you follow a link from the search engine to the
archive and the latter says the article doesn't exist, please check your
URL! Still, what'd we do without it, eh!?
I have done it exactly as you describe, it was a pain to do, but I am happy
with the result. No negative effects so far (1yr on). I also sealed the gap at
the bottom of the skirting with acrylic sealant. Go for it.
I would suggest that is a very silly thing to do, as would our timber
suppliers. I have insulated the cellar ceiling with rockwool, but left
six inches clear at each end so the joist ends don't get damp.
Before and after which, the u/f insulation or the gap sealing?
Ok, answer to a): it was warmer, answer to b): it was less draughty.
Floor is noticeably more pleasant to sit on or walk over in winter, difficult
give an objective measure of improvement, but was surprised to walk over a
cold spot and then realised it was where an area over an access hatch
was uninsulated. Old, light coloured carpet bore the signs of 'dirty
draughts', replacement carpets are clean & I can choose where & when I
want to open ventilation.
It can be easier just to cut polystyrene solid foam insulation to size and
jam it between the joists. No need for fixing battens or boards. You're not
lacking in space down there, so no need to spend extra on Celotex, just
Jablite or similar would be fine. Heat losses are low anyway, so I wouldn't
be too concerned about cold bridging through the joists either.
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