Acoustic mineral wool batts between the joists.
Then if you need better thermal performance, put a layer of e.g. Kingspan over the bottom of the joists.
would ant loaf insulation roll of 200mm do the job
I need to insulated the two rooms, this on and the one above it as both will have under floor heating.
yes there will be underfloor heating with aluminum spreader plats. I have the CAD drawing from the under floor heating but nothing mentioned about insulation in-between the joist. I understand the rigid board is the best but are not flexible. So I am thinking of 200mm loaf insulation.
sorry for the confusion. this ceiling is the floor for the room above, the picture was taken when I am standing on the GF room which will have UFH and showing beneath the FF room which I will installing UFH
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