Foam plastic under laminate flooring

[Danii KD]

Hi,

I am planning to use expanded polystyrene as insulation under an upper floor and wonder which thickness is best? Does this one work, for example? https://www.byggmax.se/isolering/cellplast/cellplast-200-xps-p61014019.

When you join the boards, do you use glue or barbs?

 

[Danii KD]

The problem is that the boards are so thick and the floor will be too high. Is it possible to use just a Platon mat on a concrete floor, for example?

 

[bossespecial]

Avoid cellplast indoors due to fire..

 

[Robert63]

I used foam plastic as insulation. 5 cm of the hardest, the blue 300xps from Byggmax and laminate over it. The one you linked to is too soft. Don't forget the underlay plastic, otherwise it will creak. https://www.byggmax.se/isolering/cellplast/cellplast-xps300-p16474

 

[Danii KD]

I laid styrofoam as insulation. 5 cm of the hardest, the blue 300xps from Byggmax and laminate over it. The one you've linked to will be too soft. Don't forget underlay plastic, otherwise it'll creak. [link]

Did you glue them together or just lay the floor on top? I'm going to apply leveling compound first and 5 cm more + floor on top will make the floor way too high. It will be above the threshold.

 

[Robert63]

Did you glue them together or just lay the floor over? I'm going to use leveling compound first and 5 cm more + floor on that will make the floor way too high. It will be above the threshold.

I just laid them, no glue. It turned out okay, but if I could do it over, I would have chosen to lay a slightly thicker/longer parquet instead, as it provides better support. If you're aware of it, the floor can feel a bit "soft."