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Build up for large void

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We have a 1930s house, and we've just decided to rip the floor up in the living room, so am looking to install UFH, as we've done this elsewhere to good effect.


The house is built on a concrete raft. The void from subfloor to FFL is ~433mm. Allowing ~20mm for a wood floor, and 50mm for a flowed screed, that's a void of about 360mm to fill. Room size is roughly 6m x 4m.


I could obviously just fill it with PIR boards though it's an inconvenient depth. There doesn't seem to be much savings using EPS (And I wonder about compression) - are there any other options I'm missing? Don't really feel like mucking about with rubble and concrete..

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