Rbps Posted May 30, 2021 Share Posted May 30, 2021 Hi, I’ve got a rear extension within 45sqm of floor area which will be new floor (insulated, concrete and liquid screed with ufh). The existing area at rear of house is 25sqm of timber suspended floor. I’ve looked at the void is 750mm deep. Is this too much to make up? So I just leave the existing as suspended and run ufh under floor boards onto insulation between joists then vent it through the new slab or fill it? The other advantage of doing that would be less chance of crack straight across what will be a new porcelain kitchen floor. Thanks in advance Link to comment Share on other sites More sharing options...
saveasteading Posted May 30, 2021 Share Posted May 30, 2021 750 is a lot to make up and consolidate properly and I would be fearful of settlement. Therefore a suspended floor is the solution. Whether timber or concrete is up to you and the circumstances. I think I would be inclined to leave the new walls lower to support T and blocks, lots of insulation and screed. ie as you would for an all new house. Timber might be easier though. 1 Link to comment Share on other sites More sharing options...
nod Posted May 30, 2021 Share Posted May 30, 2021 You will need to put an expansion joint where the two floors meet when tile 1 Link to comment Share on other sites More sharing options...
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