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Screed had air dried for two weeks before UFH turned on. UFH was turned on under instruction from heating engineer, unfortunately I don't know anything about how the screed and UFH works so did not know this was bad. Tiles will be going in part of extension and I have seen decoupling membrane...

Hi all. Have currently got builders in doing extension which has concrete floor with UFH and screed over the top. UFH has been turned on to dry the screed, raising the temp by 2 deg every two days. Some hairline cracks have started to appear in one room, and wondering if this is a problem...