Concrete slab

[S a plastering]

Could you get away with 75mm of concrete over 75mm celotex or would it have to go 100mm thanks

 

[80nobby80]

do you men screed ??

 

[user__removed]

75mm of screed is fine over celotex, 50mm is minimum thickness. 100mm I hate to lay seems to take forever.

 

[S a plastering]

No concrete not screed cheers

 

[kgreigh]

No concrete not screed cheers

Will there be screed going on the concrete eventually and what is uder the celotex(concrete)?

 

[malc]

No concrete not screed cheers

you can put the celotex under the concrete, a 100 mm concrete oversite is the norm. but we put the celotex on top of the concrete then 75mm screed. are you having under floor heating?
have you had any instruction from building control ?

 

[S a plastering]

No it's for an extension slab but digging out the slab area we've hit a big concrete mass slab which is thick just trying ways to keep it in really was going to 75 mm celotex which leaves us 75 mm to play with was thinking of screed but can't find any suppliers no underfloor heating

 

[kgreigh]

That sounds ok concrete,celotex then screed.what do you mean you can't find supplier,do you mean your local concrete batching plants don't do screed?

 

[malc]

No it's for an extension slab but digging out the slab area we've hit a big concrete mass slab which is thick just trying ways to keep it in really was going to 75 mm celotex which leaves us 75 mm to play with was thinking of screed but can't find any suppliers no underfloor heating

sounds like you have had a bit of good luck ! i would dig out and patch up the oversite to your brickwork, polythene, celotex and screed.

 

[kgreigh]

That sounds ok concrete,celotex then screed.what do you mean you can't find supplier,do you mean your local concrete batching plants don't do screed?

 

[kgreigh]

Sorry ignore the second one lol