Suspended Timber Floor, Insulation and Underfloor Heating

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Bristol
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Hi

I'd describe myself as a competent DIY'er rather than being trade/beginner DIY.

I've knocked down the wall between my Kitchen and Diner to give a 3 meter x 8 meter space that I want to install insulation under and then tile. I would appreciate comments on the following issues/questions (I've read a few other posts and there seem to be a variety of possible answers):

1) The existing Kitchen Floor (3 meters wide) has 47mm x 150mm joists at 400 mm centres. It also has a sleeper wall at the halfway point - this all seems well within the timber tables so I'm assuming that there should be no problems with bounce?
2) The to-be-built new diner floor has been speced by the builder as using 47mm x 225mm joists. No details yet on joist spacing or whether there will be a sleeper wall, but from looking at the timber tables this size of joist appears to work for a 3m span in any event? Should I ask for a sleeper wall (and potentially smaller joints) in be installed instead just to be on the safe side re. bounce?
3) I'll be installing UFH on spreader plates between the joists. I don't think I'll need to brace the (existing) kitchen floor, but what about the new diner floor - should that be braced for a 3m span? I don't want any squeaks (which I have in my loft conversion despite the timber sizes meeting the required spec's);
4) I'm planning on insulating between joists with as thick a board as possible - e.g. 120mm if possible. Is there a limit to the amount of depth of a joist that should be covered with insulation (e.g. damp/ventilation problems)?
5) I will be tiling the whole floor - other posts tend to suggest WBP ply, however I was wanting to board with 22mm water resistant chipboard with a 6mm cement board (e.g. Hardibacker) installed over it. Should that work?

I realise some of the above will be very over engineered, however from reading some experiences I'd rather tend on the side of caution.

thanks in advance for any comments.
 
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