Bright idea for Loft Floor

24 Oct 2006
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United Kingdom
My loft is currently insulated in with the standard cross-laid mineral wool. However, I would like to use it for light storage. I looked into raising the floor joists and putting down chipboard flooring but I’m concerned that this may be too heavy as it is a dormer bungalow and therefore the loft floor is supported by a timber stub walls.

My bright idea to keep weight to a minimum, ensure insulation and keep costs down is as follows.
1. Remove the top layer of mineral wool. So that only the insulation between the joists remains.
2. Board over this with 5mm plywood.
3. Cover this with 100mm Kingspan.
4. Cover this with more 5 mm playwood.

Anyone have any views on this method? Will this combination of the 3 layers provide enough strength for my 16stone to walk around plus a few empty suitcases and boxes of old kids toys?

Anyone tried this method successfully?
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