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Discussion Starter #1
We're going to be renovating our 1930s house. As part of this I would like to insulate the floor. It is a suspended timber floor, with the floor about 40cms above the ground.

We can't use spray foam insulation as the gap is too small.

What suggestions for floor insulation that won't raise the floor much or cost the earth?

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Discussion Starter #3
Is the floor covered with a vapor barrier? Where is the home?
The house is in South West London. No vapour barrier yes, all there is at the moment is an underlay and a carpet, but as part of the renovation we will replace the carpet with an engineered floor.

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Discussion Starter #5
I am confused. Is there a dirt floor directly beneath the framing or is this floor over a basement or crawl?
Yes, there is dirt floor below the joists. Quite surprising, but this is common for houses in the area!

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Discussion Starter #7
No idea on moisture. The surveyor's report concluded there weren't enough air bricks, but we've not had any issues with damp. The ground is very clay like and totally waterlogged in winter.

Unfortunately because the space is too small to allow safe access we can't use spray foam insulation.

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