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We’re midway through doing a full downstairs Renovation just now - removing wall between kitchen / dining room, new kitchen, new fire the works.
We’re now choosing the flooring - 14mm thick solid beech is the preferred option. This is to laid over our concrete subfloor. I need a good insulated underlay and looking at xps.
Question becomes what thickness is enough? I don’t want to go too thin and have a cold floor. 5mm / 6mm or 10mm? It’s the whole downstairs so don’t have to worry about height transitions into any other rooms fwiw.
Is there any downside to going 10mm?
thanks.
When you say 14 mm solid beech is that a thin beech layer on ply? Why xps insulation? Higher performance pir proably a better bet. And at that thickness all you are really doing is taking the edge of chill on the floor. The u value isn’t going to be great. Thickness is down to how tall you are and how near to the door frame you want to be. I assume you realise it will stuff up your stairs and you will be forever tripping on the different height riser as well as it not complying with building regs
Thicker is better in this scenario but all are doing minimal lifting on a non insulated slab