Installing Amtico/Karndean over insulated concrete bathroom

14 May 2012
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United Kingdom

We're struggling to find the best way to install Amtico floor tiles on a concrete sub-floor but with some form of insulation inbetween. As it's inside a bathroom the insulation needs to be moisture resistant.

The concrete floor has a DPM below the surface concrete screed and a cellar below that.

We were thinking of first installing warmup insulation boards (or Marmox which have a very similar composition), then taping over the gaps, then applying a latex levelling compound before fitting the Amtico.

We would welcome any thoughts on this approach, and advice on how best to tape over or seal the joins in the boards if we're on the right track.

The boards have a compressive strength of 3kg per square cm which we think is strong enough but again would welcome your thoughts.

We have seen alternative solutions on the internet such as Karndean's Versilay, but this is expensive and doesn't appear to be moisture resistent.

Many thanks,
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