Discuss Newly laid porcelain floor tiles over UFH, showing lines, in the Canada area at TilersForums. The USA and UK Tiling Forum (Also now Aus, Canada, ROI, and more)
Hi. Did he use grey adhesive?new porcelain floor tiles laid 4 weeks ago over new electric heating matts. Heating only connected a week ago and dark lines showing on most tiles?
possible causes? Any help/ guidance appreciated. Laid by tiler not DIY.
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YesHi. Did he use grey adhesive?
and that would show through an 8mm porcelain tile?
HiThey are 2 things you have to know, did the tiler cover the underfloor heating with self levelling and he gone for grey adhesive and dot and dab.
It has been known yes , hence why a solid bed is best achieved.. on light tiles no matter the biscuit ( body ) , i use white adhesive.and that would show through an 8mm porcelain tile?
thanks for responses.....don’t know how I would prove tiles were at fault?Might be the quality of the tiles
Thnx. Are lines likely to be permanent? Tiles laid 4 weeks ago UFH only hooked up a week or so ago.It has been known yes , hence why a solid bed is best achieved.. on light tiles no matter the biscuit ( body ) , i use white adhesive.
We had a similar issue on a job. We were brought in to investigate for insurance purposes.new porcelain floor tiles laid 4 weeks ago over new electric heating matts. Heating only connected a week ago and dark lines showing on most tiles?
possible causes? Any help/ guidance appreciated. Laid by tiler not DIY.
View attachment 114140
Thanks for that.We had a similar issue on a job. We were brought in to investigate for insurance purposes.
1.There was no membrane put down onto the new concrete flooring and the moisture came through from the concrete into the grey adhesive and stained the tiles.
2. The tiles weren't fitted correctly many where dot and dabbed there was actually pools of moisture when we lifted the tile.
3. The tiles where laid onto concrete that was new and hadn't been allowed to cure and dry long enough.
Hope this help
It’s the adhesive, sorry but simple as that.Thanks for that.
the kitchen was extended so part old floor part new, there was a DPM but down on new floor,. New floor was a quick set of about a week, but was left for some 6 weeks before anything went down onto it, however the lines are on tiles on both old and new floor so,fairly sure It’s not the floor. I assume that’s a reasonable assumption?
truth hurts! I now have to decide having new tiles ripped up with all the mess involved even more of an issue with electric UFH mats underneath or live with the lines 😱It’s the adhesive, sorry but simple as that.
My guess is that the SLC didn't lose it's required moisture content prior to tiling, and everybody just carried own piling down more stuff and trapping more moisture...new porcelain floor tiles laid 4 weeks ago over new electric heating matts. Heating only connected a week ago and dark lines showing on most tiles?
possible causes? Any help/ guidance appreciated. Laid by tiler not DIY.
View attachment 114140
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