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Tiling on Underfloor Heating
Anhydrite Screed Question
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[QUOTE="Element, post: 803993, member: 27322"] I had never heard of Anyfix until today. However the update is the screed was 50mm deep, left to dry six weeks before the screed company scarified the surface (IMO, they did a pretty poor job too) I then applied the primer and tiled on top. No moisture reading was done; I didn't know (then) a reading was necessary, and have never used a moisture meter & nobody mentioned it at the time despite my asking as much info as I could locally with suppliers & builders. I spoke with TM today and they said that an anhydrite screed should dry for 7-10 days and then be sanded to allow the moisture to escape. The screed company didn’t do this. Then in an ideal world the UFH should be commissioned incrementally to further aid the screed to dry and only when the floor is dry should the priming & tiling be done. The plumbers didn’t commission the UFH until 3 weeks after the tiling was completed. Today I lifted one tile and found the adhesive fully bonded to the tile and the primer; the tile pieces came up with the adhesive & primer intact as one leaving the anhydrite floor clean beneath. The primer under the tile was damp to the touch. Now I know why; the floor was not adequately dry when the primer went down and further sealed the moisture in. With the UFH on now, the moisture is causing the bond of the primer to the screed to fail and the tiles are loosening up. I suspect the whole lot will need to be removed and the floor fully dried out before another covering goes back down. It’s been a bad day. :( [/QUOTE]
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Tiling on Underfloor Heating
Anhydrite Screed Question
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