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but what about void insulation - is it required?

OK, this sounds interesting. What kind of ply thickness do I need if the joists spacing is 400mm?

chipboard has T&G - will be easier to lay down as I don't need to put any noggings to support joints. 600x2400 panels are easier to work with than 1200x2400 for plywood (even not sure that I will be able to bring such a big sheet upstairs)

I'm going to replace floorboards (chipboard) on the 1st floor as they are not level and were cut in pieces to route central heating pipes (this was done many year ago and look ugly with many unsupported joins, cracks etc). Now space between joists is empty. According to current building...