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[QUOTE="Ajax123, post: 980302, member: 12267"] Movement joints are the proper name for Expansion joints (I'm a screed tech guy so a bit pedantic on naming) screeds and of course tile expand and contract so the joints are there to mitigate risks of failure due to movement in both directions. from the screeds perspective there should be movement joints across all door thresholds, between independently controlled heating zones and where heated meets unheated screed. These are standard requirements and your screed installer should have installed these as a matter of course. These should reflect through the tile face. if the joints have been omitted you can get shrinkage restraint cracks (exactly as you have described) as the screed shrinks. This is more pronounced with cement based screeds than with anhydrite based screeds so joints are more important. If the screed does crack at these points there is a risk that a tile, bridging the crack, will be subjected to differential stress as the screed moves during thermal cycling at different rates in the areas the door separates. Running Ditra over them is not a technically correct way to do it. The right way would be to repair the cracks with a suitable resin repair and then retro install a suitable movement joint (saw cut to 1/3rd the depth of the screed). this can then be properly reflected. It would be for Ditra to offer an opinion as to whether it would work or not but it may work as long as the screed does not curl. Cement based screeds are prone to curling and this is common where such cracks occur. This leads to vertical movement and if this happens ditra most definitely will not work to bridge it. and yes tiles expand quite a bit. When you look at the numbers it does not sound much but if that expansion bay to bay is sufficient to overcome the modulus of elasticity of the adhesive used then the tiles will pop. Also if the grout gaps are not big enough to allow for expansion tile to tile then the tiles will have no where to go but upwards leading to tenting. [/QUOTE]
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