Thick screed wobbles….

[saveasteading]

17 hours ago, Oz07 said:

in the floor slab and have no screed 

Your logic for this would be of interest. 

Are you putting insulation onto sub-base or a screed? Reinforced slab? Where does the piping go?

 

My answer:

Because it is tricky to get it flat and smooth at a robust stage of the project. Also, most people seem to have overdesigned slabs IMHO.

for me, Sub-base, 100 - 150 slab, light or no mesh , pir, pipes, screed. That gives us a good hard working surface, then plumbing and screed in controlled circumstances.

[Oz07]

 

4 hours ago, saveasteading said:

Your logic for this would be of interest. 

Are you putting insulation onto sub-base or a screed? Reinforced slab? Where does the piping go?

 

My answer:

Because it is tricky to get it flat and smooth at a robust stage of the project. Also, most people seem to have overdesigned slabs IMHO.

for me, Sub-base, 100 - 150 slab, light or no mesh , pir, pipes, screed. That gives us a good hard working surface, then plumbing and screed in controlled circumstances.

I've always just used the structural slab as the only floor when building with a ground bearing slab. Not used UFH in those though.

I normally do hardcore, blinding, dpm, insulation, dpm 100mm slab and job done. Use the self compacting concrete to get a good flat finish. Bet it would be squeaky bum time putting some crack control cuts in the slab with UFH pipes in there! I can't see the logic in putting 2 floors in but obviously each project is unique and has reasons.