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Water UFH Cemfloor liquid screed with heating

Discuss Cemfloor liquid screed with heating in the Underfloor Heating area at TilersForums.co.uk

Localtiler

Trusted Advisor
Professional Tiler
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I thought I would put this on as these screeds are becoming increasingly popular and there seems to be incorrect advice been given by the screeders. Pumped in, rapid drying cement based screed with underfloor heating which they claim you can tile on directly after 7 days and you don’t need to sand, well you do need to sand as there is clearly laitance on the surface, I used a diamond cup to sand this but it can be sanded using a course abrasive paper as it’s much softer than anhydrite in my experience. This was left 28 days before I tiled it, and the underfloor heating was commissioned correctly. I fitted durabase mat as there’s going to be some extreme temperatures in this room and with the screed being new. Here’s the job, at a listed 16th century old vicarage in Derbyshire.


First picture shows the screed when first poured and the curing agent they spray on top, second pictures show the laitance, then it after sanding.


23E66838-AE99-429A-90D5-7A7EFC6632B4.jpeg

94BBDB42-8482-4762-B98E-1C374F74DF92.jpeg 799340B9-5924-49DD-87B5-A58EEA201220.jpeg 6545C859-A3C9-429D-B73B-94F8E10EA606.jpeg F59D0D7F-57D9-4756-AC5A-7FB1D996F903.jpeg E45C0E23-C822-481D-9D7B-8AAC12E09EBD.jpeg A603373D-3B9A-45FF-91E1-F8BA10B845C5.jpeg 5C050DD4-AF45-4333-9D9C-D85883AC3076.jpeg 553EA1BB-CF8E-4470-B978-AE928994F8C5.jpeg 9D8CB267-CD1A-439D-BAC0-14CF658C5FC5.jpeg B9402408-1055-4122-85A4-819BE35D4FE6.jpeg B31F52AF-FFDD-484F-AA8C-0C12A9C8464A.jpeg 9BCBB271-FEF3-4DD2-B1DC-07D280299F22.jpeg 33C6C602-E974-4F77-8DE5-2B2149211DCA.jpeg
 
Last edited:

LEE MAC

Trusted Advisor
Professional Tiler
JOTM Winner
I thought I would put this on as these screeds are becoming increasingly popular and there seems to be incorrect advice been given by the screeders. Pumped in, rapid drying cement based screed with underfloor heating which they claim you can tile on directly after 7 days and you don’t need to sand, well you do need to sand as there is clearly laitance on the surface, I used a diamond cup to sand this but it can be sanded using a course abrasive paper as it’s much softer than anhydrite in my experience. This was left 28 days before I tiled it, and the underfloor heating was commissioned correctly. I fitted durabase mat as there’s going to be some extreme temperatures in this room and with the screed being new. Here’s the job, at a listed 16th century old vicarage in Derbyshire.


First picture shows the screed when first poured and the curing agent they spray on top, second pictures show the laitance, then it after sanding.


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Ajax123

Tilers Forums Pro - Screed Advisor
Trusted Advisor
Professional Tiler
Nice to see the screed treated with common sense rather than blind faith that the screeders was giving good advice. If he said it could be tiled after 7 days and it didn' need sanding he was talking bull...
 

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