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[QUOTE="alexhackett, post: 980300, member: 57941"] Thanks Ajax. Am i right in assuming movement joints in the screed are different from expansion joints in the tile layer? Regarding the movement joints, what we have down stairs is basically a piece of the expansion foam in the doorway between the hall and the main open plan space. This effectively creates two separated areas. All the edges had the expansion foam installed prior to screeding. There are no other joints in the screed. It's been down 6 months+, actually probably 9 months, and its been heated and cooled a few times etc. There aren't any cracks other than 1 or 2 hairline ones which we were told would happen. Upstairs, there are wider cracks emanating from the door ways which happened a month or so after the screed was laid and it dried. Some spaces i.e. between landing hall and rooms had foam between them, others didn't. Again, these floors have ufh and the screed is c. 50mm cemfloor. All bone dry now, well probably 8 months ago. Heated and cooled a few times. This is not a quick renovation! Because these cracks aren't straight across the doorways, more of a bow type shape, there's no way a tile will follow them. There's no movement in the vertical plane as far as we can tell. For info, the house was built in the 1960's and first floor is basically concrete slabs between steels. We then insulated with 25mm celotex, tanking sheet, ufh and then screed poured. So, the actual structure of the house (sub floors etc.) is as stable as it's ever going to be. So, with these cracks do we simply run the ditra mat over them, but still have a neat silicone joint in the doorways, or is the silicone joint in the doorways unnecessary? My understanding is that the ditra mat effectively means that the tile floor is separated from the screeded floor, and the expansion joints in the tile layer are simply there to allow the tiles to expand. But, do tiles really expand that much bearing in mind there will be at least a 10mm gap around all the perimeters under the skirting.? [/QUOTE]
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