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Old 19 December 2015, 11:43   #11
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If I lived in the Falklands and faced the costs of shipping lots of fresh air there I'd be wondering whether there was a local material like sheep fleece that might be practical?
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Old 19 December 2015, 11:47   #12
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Did someone drop this?

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Old 19 December 2015, 11:47   #13
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If I lived in the Falklands and faced the costs of shipping lots of fresh air there I'd be wondering whether there was a local material like sheep fleece that might be practical?
Or you might p-p-pack it with penguins?
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Old 20 December 2015, 05:33   #14
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I would do it with xps insulation, working from top of the floor. Its such easy to cut, clean job and finishing using pu foam(the botle stuff) it will be air tighter than any other solution. Would remove any other old/previous insulation. Easy to make flush with existing floor structural beams, so no change inside the house.

If using rockwool You need to build "carrier" planking to keep it in place(not needed with XPS), that need to be done from the underside. Then You need breathable wind stopper material beneath the rockwool if done properly.

Guess 100 mm would be a great improvement so for an 100m2 floor, you need almost
10m3.....(less the beams), might hurt for the transport cost, don't know would rockwool be much cheaper though.

Know that in some houses insulation improved by 2K PU foam, but defo not a DIY job, very risky business, would not be my choice in any case.
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Old 20 December 2015, 07:05   #15
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If I lived in the Falklands and faced the costs of shipping lots of fresh air there I'd be wondering whether there was a local material like sheep fleece that might be practical?
Or a way to put the air in yourself like a PU spray...

Can presumably be applied right to keep airflow under it and stop condensation.
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Old 20 December 2015, 07:16   #16
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if useing rockwool take up floor boards and nail chicken wire to on side of the of the joist and up the other side and form a cradle for it to liy in thats how I would do it.
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Old 20 December 2015, 12:20   #17
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I'd be making some holes in the floor and fill the cavity with vermiculite. I've done this as wall insulation between a stone cottage wall and plaster board and it's been in place for many years without a problem.

With a bit of ingenuity, I'm sure you could simply blow it in to fill the space.
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Old 20 December 2015, 12:26   #18
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Here's a wee link. Download the Construction Market PDF then read the last paragraph.
Home - The Vermiculite Association
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Old 20 December 2015, 12:32   #19
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He would be filling the sub-base under the floor and the price of that stuff he would have to sell his RIB lol
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Old 20 December 2015, 12:37   #20
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The second one would probably be easier to fit but I am wary of it, as unless it is a very good fit, the slightest air gap around it would appear to render it completely useless as the cold air just flows around it and gets to the floor anyway.

I've seen a few references about getting a good fit with rigid foams & I can't see the problem. We built a very substantial extension including a cellar in 1999-2000. We used Celotex & Kingspan throughout for floors & ceilings respectively. Cut the foam with an old bread knife or hand saw, fit it in place. Hold it with a couple of galvanised clout nails into the joists & get jiggy with the expanding foam, we used gun grade foam, much easier to control & cheaper. Result, perfect airtight self supporting insulation. Add under floor heating & whole house heat recovery system, toasty & cheap to run.
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