Advice regarding screed in old terraced house

[hastahasta]

Hi,

I'd like to put wet underfloor heating into my terraced house. The floor make up at the minute is the original concrete floor, and then in the 1980's when an extension was built, they have packed up 2x4 timbers on top of this to raise the floor level (which is bouncy, creaky, and cold) So I could pretty easily take that up, put DPM, insulation, and screed on top of the original concrete floor to get to the same floor height.

My worry is, could adding the DPM on top of the concrete floor cause damp to be pushed up into the walls? The concrete floor is very dry, and there has never been any issues with dampness, but it feels like there is some airflow underneath the timber floor - and I'm worried that removing this airflow will cause dampness.

Thank you!

 

[noseall]

My worry is, could adding the DPM on top of the concrete floor cause damp to be pushed up into the walls? The concrete floor is very dry, and there has never been any issues with dampness, but it feels like there is some airflow underneath the timber floor - and I'm worried that removing this airflow will cause dampness.

Thank you!

Going higher is never a problem. It's when people want to reduce the floor height that damp problems usually occur.