Building up solid floor

We have a job to price in a school where thick solid parquet flooring about an inch deep has to be lifted, and the floor built up to the same level again and safetyfloor installed.

As I understand it, if built up with say 18mm plywood screwed down, then 6mm, and covered with an impervious flooring, the wood will not be able to breath and there will be condensation problems, possibly causing adhesive emulsification.

To put a flooring screed over bitumen adhesive 25mm thick (over 90 m2) would cost a fortune.

Do you have any budget based alternatives guys?

 

In the past I’ve used Ardex A35 which is a rapid drying screed/cement. You can get this as a ‘mixed’ bag which is a bit more expensive (but you just have to add water) or as a bag without the added sand but you will have to source the sand yourself. Effectively you will be laying a new sand and cement screed.
With it being 18mm you will have to bond the subfloor before applying.


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Cover the bitumen with ardex Na then use a 22mm chipboard floated or stuck down then ply over that


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Or use a proper dpm sheet over the bitumen and get a liquid gypsum poured in to 25-30mm


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Both ways will need a dpm sheet


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When you say 'dpm sheet' do you mean visqueen or a resin coat DPM?

 

Either I suppose but a sheet would be much cheaper


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Thanks mate, good advice.

 

Murexin fma30 moisture tolerant screed, far cheaper than a35

 

Get the floor Asphalted. Cost is less and it’s a dpm.


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