Sand and Cement Screed Thickness

[Conor]

We have a 250mm floor build up in our basement. The current design is 150mm PIR and 100mm S&C screed.

 

Can I go to 175mm insulation and 75mm screed, or will that be too "bouncy"? Google suggests 75mm or even 65mm is OK.

 

It's 115m2, and I'd rather be paying for insulation than screed.... and it's only £9 more per sheet to go from 100mm + 50mm to 100mm + 75mm.

 

 

[Declan52]

Mine was 75mm on average across the floor. Some bits might have been near 70mm and others maybe 80mm. No bounce at all on with it.

[dpmiller]

or you could go poured and down to 50mm

[tonyshouse]

What is under the insulation?

[nod]

Same build up as ours 

175 + 75 mil ish