Floating floor construction

Old 06-07-08, 07:59 AM
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Floating floor construction

Hi all,

I am trying to decide on how to install a new wooden floor in my kitchen. It has an old (~60 yrs) concrete screeded floor, which I believe does not have a damp proof membrane installed. It is probably not very level (though I dont know exactly how flat it is yet until I remove the current covering and kitchen units etc. I believe part of it has had a layer of bituminous self levelling stuff poured over it which has the current ceramic tile covering on top of it.

I would ideally like to lay a floor of pine T&G boards over battens attached to, or floating on the floor. I do not want to use an impervious flooring material such as most engineered laminate flooring because I want the concrete floor to be able to ''breathe' and release any moisture that may be in it due to the lack of a membrane.

Could anyone make any suggestions on how to go about constructing a battened wood floor?

Many Thanks,
Rob Irons
Old 06-07-08, 01:48 PM
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Two layers of plywood attached to one another laid over the older concrete may be a solution for you. Screw two layers of 7/16" or 1/2" ply together while overlapping the underlying plywood seams. Don't attach to concrete. Use moisture barries under plywood such as 6 or 8 mil visqueen(plastic sheething) found near the paint department in the big box stores.

Once it's all said and done you can nail or staple solid 3/4" over the ply, providing it doesn't increase the floor height to cause problems with other entities.
Old 06-08-08, 10:41 AM
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Floating floor

I agree with Hardwood... Only thing to add is to make sure you leave a 1/2" expansion space along all edges of the plywood AND leave a 1/2" expansion between each sheet of plywood AND make sure the top layer of ply is set so that the expansion joints on first level are covered. I have had 3 floating floors over many years and they are the best... strong, sturdy, they cut down on transmitted noise, and yet have just enough give to feel great.

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