New concrete bathroom floor. Previously floorboards

Joined
7 Feb 2005
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Location
Northamptonshire
Country
United Kingdom
Hoping to change my old joist and floorboards floor to solid concrete.
We have a 200mm void below the floorboards.
What thickness of insulation board and concrete screed do I need?

DPM will be put below and above the insulation boards.
 
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