Damp proofing a suspended wood ground floor

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Hi

I am planning on installing an engineered floor in my ground floor living room. The subfloor is of suspended wood construction, with wood jiost that i will cover in ply. There is a 3 feet void underneath, onto rough earth.

It is a little damp underneath and as part of the installation i will be improving airflow by introducing more air bricks at both ends.

There is a little damp smell down there and I am concerned about how to damp proof the floor. Should i seal the ply completely? Should i lay down a damp proof membrane? Do i need to align the damp proof course and the floor?

I have read conflicting advice, some saying you should seal completely and others saying you should leave air gaps so the floor can move and 'breathe'.

PLease help!
thanks
 
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roll out a sheet of plastic across the soil and stick a couple of bricks on it to keep in place. This will reduce the amount of water vapour under your floor. When fitting the plywood leave a couple of mm gap between them to allow for any expansion. ( only very small on plywood ) It is good practise to also treat the plywood underside and joists to.
 
should i put some sort of membrane on top of the plywood but under the wooden floor?
I have read in places that this is a bad idea as the floor should be allowed to breathe, andthe sheet may create condnesation...?
 
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Many thanks :LOL:

So what I am doing is this:

1. Placing plastic sheeting on the floor
2. Plywood, 18mm treated. Have been recommended to seal the gaps between the ply and walls with a caulk?
3. Insulation boards, 10mm
4. Depron insulation, 6mm
5. Underfloor heating matt - super thin film version
6. 15mm engineered board

All good?

thanks again for advice
 

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