it is fine having plastic pipes in the screed without joints and without conduit, but as you rightly say UFH is done that way, But UFH pipes have 65 - 70mm of screed on top, I doubt the pipes in the pictures will have that much coverage, so he will risk cracking of the screed, as for joints in the floor Tony, well pictures //www.diynot.com/network/alunmorris/albums/13192/49122 looks like these will be buried in screed and picture //www.diynot.com/network/alunmorris/albums/13192/49148 definately shows a joint buried in the screed
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