Have just taken old engineered wood floor up ready for screeding and new floor to be fitted. The room is an extension.
However on the outside wall, we have french doors and whoever built extension seems to have left a gap from what looks like block work to the doors and filled the gap with polystyrene to enable the existing floor to be laid.
Could I just infill with concrete and put a dpm on the door side (to cover red bricks) as there doesn't seem to be any sort of damp protection from under the French doors although there is a dpm showing throughout the outside wall?
Any advice appreciated.
However on the outside wall, we have french doors and whoever built extension seems to have left a gap from what looks like block work to the doors and filled the gap with polystyrene to enable the existing floor to be laid.
Could I just infill with concrete and put a dpm on the door side (to cover red bricks) as there doesn't seem to be any sort of damp protection from under the French doors although there is a dpm showing throughout the outside wall?
Any advice appreciated.