BotusBuild Posted February 15 Posted February 15 We have about 130m2 of foundation slab that 1) needs to levelled and 2) needs to be raised by an average of 55mm. The foundation slab already contains the UFH pipes so there would be no intermediate insulation layer - the screed can be poured directly on the slab as far as I am concerned. I have read that Cemfloor can be used in this manner and the min thickness is 25mm for such a bonded application. All the installers I have contacted want a membrane installed first and I have pushed back quoting from a document they sent me as part of their quotation packs. Their also asking for an edging strip to be installed as well, but this screed will sit up against the EPS of Nudura ICF, which surely itself will absorb any "movement". Awaiting their response, but I would love to hear if anyone else has applied Cemfloor just as a levelling screed with no membrane between it and the foundation slab.
nod Posted February 15 Posted February 15 You can’t put it down directly onto a slab It will pull in to quickly And edging strip is needed for expansion and will take about 30 minutes to install 1
Mr Punter Posted February 15 Posted February 15 I have seen it marketed as a bonded screed, so I can't see an issue. They may want the subfloor cleaned and primed.
boxrick Posted May 28 Posted May 28 On 15/02/2025 at 17:15, BotusBuild said: We have about 130m2 of foundation slab that 1) needs to levelled and 2) needs to be raised by an average of 55mm. The foundation slab already contains the UFH pipes so there would be no intermediate insulation layer - the screed can be poured directly on the slab as far as I am concerned. I have read that Cemfloor can be used in this manner and the min thickness is 25mm for such a bonded application. All the installers I have contacted want a membrane installed first and I have pushed back quoting from a document they sent me as part of their quotation packs. Their also asking for an edging strip to be installed as well, but this screed will sit up against the EPS of Nudura ICF, which surely itself will absorb any "movement". Awaiting their response, but I would love to hear if anyone else has applied Cemfloor just as a levelling screed with no membrane between it and the foundation slab. Roughly what's the price of screed material you have been quoted for that floor?
scottishjohn Posted May 28 Posted May 28 (edited) Iwould worry that it is too thick and will take foreverto dry out Icould be totally wrong just when mine was done it took 6weeks with underfloor on to get down to the 3% moisture the floorers wanted to lay stick down LVT and that was after they had ground it all to get it toally flat but the final job showed they knew what they were doing best trade on the job by far that floor is made up from hundreds of little bits only big bits are thesquretiles -even the border is seperate bits Edited May 28 by scottishjohn
BotusBuild Posted May 28 Author Posted May 28 14 hours ago, boxrick said: Roughly what's the price of screed material you have been quoted for that floor? We paid £2700 ex VAT
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