Revisions log for Answer #169
This is the answer to the question Can the height of the floor structure with the ventilation ducts and the heating system be 150 mm?
Revision 1
As for the planned screed thickness of 45 mm, it will not be a standard heating screed, as it is too thin.
The heating elements of a water underfloor heating system are usually 12 mm in diameter. If we add some uncertainties, we round up to 15 mm. The cement screed should match this thickness (15 mm) plus the enclosed thickness of 45 mm (60 mm total), which applies to conventional cement screed in residential construction.
If only 45mm was actually calculated and the thickness of the heating elements was subtracted, then 45mm – 12mm = 33mm would be left over the heating elements.
This is acceptable with mastic asphalt. So discuss this again with the general contractor.