Hi, we are looking at Karndean/Amtico for our kitchen/diner/hallway. Existing floor surface is self-levelling screed on top of an uninsulated concrete slab. It's a low energy retrofit so the architect's plan is to overlay a thin layer of Kingspan onto the screed and then float a glued chipboard/plywood floor on top of that. LVT would then be glued to the ply. I need the build-up to total around 50mm due to slider and external door heights. I'm currently thinking of something like: butted 20mm kingspan < floating 18mm glued T&G chipboard < screwed 9mm flooring grade ply < glued LVT Any issues with that plan? Thanks in advance for any advice
To much movement imo I’d be going a themo top board glued down with a ms adhesive then 10mm fibre smoothing compound.
Maybe look at a gypsum based liquid screed. They can go in thin and will be more stable than floated chipboard.
