Which screed?

Hi All, My new build will have a beam and block floor. My architect has shown 65mm sand and cement screed. The 1st screed installer I contacted has said I would need 75mm flowing concrete with steel fibres or the floor will bounce. The 2nd installer said not and that I would be best with 50mm standard liquid screed. Any thoughts? Cheers

By DerbyLad, January 25, 2021
16 replies

If this is a ground floor I would recommend a supporting wall mid span. If its a first floor then.. We have a 6m room and our SE recommended two steel beams to reduce the span of the concrete beams. It was only two because of the location of a window. One mid span would have been fine. Are you having UFH? If so I recommend at least 100mm or PIR and ideally more like 120mm under the screed. Normally 65mm sand cement screed is fine. Could go thinner and add more insulation