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are expansion joints in tiling pointless if there is no expansion joint in the screed ?
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[QUOTE="Ajax123, post: 840459, member: 12267"] in direct answer to your question there are 2 reasons why expansion joints in the tile face are required even if there are no joints in the screed. firstly though the British standard for screeds says that for sand cement they should be split into bays approximately 40m2. If this is not done and you tile it technically you would be acting without due diligence so could be held liable if there is a problem later unless you have demonstrated that you don't need the joints in the screed e.g. with anhydrite. Now for the reasons. If you are happy that no joints are needed in the screed and do not put joints in the tiles you will not have followed the British standard for tiling which sets out joint spacing. Again if this causes an issue later on e.g. restraint cracking or bellying then you could be held liable as you will not have observed Due diligence the second reason is that the screed and the tiles may expand and contract at different rates and to different extents. again with reference to anhydrite this is more dimensionally stable than cement based screed so requires fewer joints. the rate at which the tiles will expand will be greater than that of the screed. As the tile face and the screed do not act in a truly composite manner due to the flexibility of the adhesive undue stress will be placed on the adhesive/screed interface and the tiles will pop off. so you need to relieve this stress by incorporating joints in the tile face. there you are... clear as mud [/QUOTE]
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are expansion joints in tiling pointless if there is no expansion joint in the screed ?
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