July 13Jul 13 GF tiles have arrived and we are a week away from the tilers coming on site. Tiler says there is no need for expansion joints, he just leaves a gap and fills with silicone and then they are almost invisible. I'm naturally concerned. And I suspect that the only reason to run a bead of silicon is to save money on the expansion strip. Tiles are 120x60 on KORE slab. And its a big area, about 120 m2 total. Unlike screed there are no expansion breaks at door thresholds where I think the expansion strips would probably go. UFH in slab but uniform low stable temps. Do I need expansion gaps and if so then should I insist on proper aluminium (or stainless steel?) expansion joints instead of a line of silicone? What are the best ones to get? The schluter are twice the price of genesis. And how wide, 8mm? And should the floor be primed first? I think a uncoupling mat is probably unnecessary?
July 13Jul 13 If there is crack control breaks in the slab you will need to follow these in the tiles. If not, you should be OK with nothing.
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