Replace suspended timber floor with concrete?

[CCoomber]

Hi everyone,
So I'm working on my own house and the plan is to install water based underfloor heating for the downstairs.

Currently I have a suspended timber floor which appears to be in good condition (if not 100% level), I was wondering cost-wise if I'm prepared to do most of the work myself how much would I be looking at to convert it to an insulated concrete floor. I already have the insulated I would need.

I also would appreciate any advice, horror stories, or opinions.

Cheers.

 

[freddiemercurystwin]

How deep is the void underneath?

 

[CCoomber]

The void is 6" beneath the floor joist and 10" to the top of the joist.

The insulation I have to do the job is 100mm Kingspan thermafloor TF70.