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All I've asked for from the builder and plumber is warm feet in winter and a seamless transition between the floorboards in the hallway and tiles in the kitchen.
You won't get that if there's no coupling between the heating elements and the surface on which your bare feet are gonna go. Rather than a ply top, you'd need a compound, like you say, that connects the heating elements to the tiles.
Maybe I've monumentally misunderstood what the plan is and that's what's happening. All I've asked for from the builder and plumber is warm feet in winter and a seamless transition between the floorboards in the hallway and tiles in the kitchen. The builder was talking of some self levelling screed so maybe the ply is only temporary. I've been so busy at work and with the children that I haven't really had the head space to ask the questions.
I've been skip diving on the street over the last few years on a mission to reinstall some original features and have amassed a collection of original architrave which has been stripped by PJ Pine in Crystal Palace and ready for installation on the rear of the door heading back into the hallway.