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Joists Strong Enough!?


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We have just bought a 1960's bungalow with a suspended floor, the gap underneath ranges from 700-400mm.


The joists are currently 50 x 100mm


My plan for the renovation was the installed UFH throughout on the ground, between the joists I would lay 75mm kingspan insulation, then clipping UFH pipes then screed 25mm up to the level on the joists. Then floorboard/tile board for tiles to be laid on.


I was just wondering if the joists would be strong enough to hold this extra weight? They are supported underneath at intervals by brick walls (with air gaps) but not sure exactly how far apart yet until I do further investigation


What are peoples initial thoughts? How would they go about this?


Many Thanks

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