Damp Proofing and Insulating a concrete floor for Solid Floor Boards

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23 Mar 2013
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Essex
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United Kingdom
I am soon to be fitting solid wood flooring and will be doing this with hidden screws in the tongues of the boards, so I will be using a ply sub-floor on the concrete. (I did this with the other room, same boards, and was happy this way)

I would like to also insulate under the boards but I only have a total of 45mm, with the boards being 20mm.

There was also some signs of damp on the previous carpet, however, I am not keen on tanking the floor as there are a few asbestos tiles left on the floor, and would prefer to leave them alone.

This is what I was planning on doing:

1) Damp Proof membrane sheet (I have a spare roll, unsure on the gauge, but it is thick)
2) Over lap this DPS up the walls slightly to be covered by the skirting
3) 12mm Celotex Insulation Boards - Pressure fitted with the joints taped
4) 9mm Plywood - Screw this ply to the concrete - Leave about 10mm expansion gap
5) Solid Wood Flooring

12mm Celotex + 12mm ply + 20mm Flooring = 44mm

Happy to hear your thoughts to this way of Damp Proofing and Insulating a concrete floor?
 
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