Concrete floor slab insulation above or below

[karl293]

Hi all please can you help me, I am laying a concrete floor in outhouse 40m2 drawing show hardcore, dmp, slab, insulation then mesh then  screed.


Most people seem to to hardcore, sand blind, dpm insulation another dpm and then slab, screed which I believe could suit me better.


Which I your option is better and what are the advantages off each, I will be fitted piped overflow heating on Flo max screed boards

Thanks 

[Dave Jones]

you dont want the insulation under the slab unless its structural. 

 

hardcore, sand blind, DPM, conc.  then insulation, ufh and screed.

[jayc89]

In part of our house we have hardcore, sand, DPM, Conc, PIR, membrane, screed.

 

For the extension I plan on; hardcore, sand, EPS, DPM, conc + mesh. Which will allow me to avoid paying extra for any screed. 

[JohnMo]

Follow what your structural engineering drawings show, don't make it up as go along.  If you don't have structural drawings get them and then ask the structural engineer why he has specified what he has.

 

3 hours ago, karl293 said:

Most people

Who are most people, mine is nothing like you suggest, but exactly as your drawings show.

[Dave Jones]

you dont need an SE to spec a floor as long as its standard building control compliant.

[Iceverge]

4 hours ago, karl293 said:

Most people seem to to hardcore, sand blind, dpm insulation another dpm and then slab, screed which I believe could suit me better.

 

Why not this but omit the screed and powerfloat the concrete?