Floating floor insulation

On Saturday 12 January 2013 10:30 boondocker wrote in uk.d-i-y:

I bet they were 50mm thick when they went in.

Tricky - not sure what to suggest...

Maybe one or more of:

- replace all the insulation with 50mm

- use thinner board over the new insulation

- lower whatever it is that the insulation sits on

- lay some 2mm sheet material over the part of the floor which you

Is this a ground floor bathroom with a solid sub-floor? If not, what's under the slabs of insulation?

In that case buy some 50mm and before fitting sandwich between 2 flat sheets of wood/chipboard with some heavy weights on top.

On Sunday 13 January 2013 12:51 alan wrote in uk.d-i-y:

Might not be that easy. I've seen jablite compress over a decade or more with percussion loads - eg by doorways.

I can make celotex a bit thinner by thumping it - but only at impact points. Conversley I can walk on unprotected celotex with no permanant deformation.

Thanks for those suggestions. The flat is a first floor flat with a concrete subfloor. Thinner board might be an option if available, as would laying 2mm board over the non-rebuilt area. Either option will mean a weak point where the different thicknesses of insulation/board butt up against each other which may cause issues with the final floor covering which is another question entirely!

In fact, as the floor moves so much I'm really struggling to find a suitable floor covering at all.