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Thanks for all the info Richard, Ply is a big issue, cos it's already glued and screwed! Joists are not equi-distant - range from 360mm centres to 450mm, but I have put noggins in everywhere (glued and screwed). Also too late to seal the underside and edges of the ply.... But if I am...

Yup - warmup UFH, and the peeps from warmup tell me that as I have a 18mm plywood floor straight onto joists I will need tile backer boards. Both warmup and my local tile supplier tell me that the warmup boards will suffice as backer boards.

This is probably a daft question, but.... I'm laying 10mm warmup insulation boards on 18mm ply (no sub-floor below the ply). Warmup site says to use flexible adhesive, then screw the insulation boards using washers. I am concerned that if I use a washer the screw/washer will not be flush...

Thank you kindly sir! Thought I could trim the box with a knife or hacksaw, but wasn't sure that if I cut it, the front 'bits' would fix back on...

Greetings good Earth-people! I've just bought a Geberit concealed frame/cistern for a wall-hung WC. The flush plate as supplied will project too far so I need to (obviously) make it shallower. The concertina-type plastic box part has minimum and maximum markings, but I'm not sure how to set...