Hi all
A little over 5 years ago I bought a 1970s (dump) house and discovered a water leak in buried piping (concrete ground floors). This has resulted in a significant number of rotted skirtings and door frame bottoms. Also, at each doorway threshold, the floor screed has blown. Digging down below floor level and investigating the construction detail yesterday I discovered: there doesn't appear to be any dpc to internal wall the dpm below the concrete floor slab comes vertically up to floor level at the edge of the slab alongside the internal brick wall IYSWIM so the internal wall has plastic membrane either side of it from just-below-floor-level to the underside of the slab
As a result, threshold bricks are damp, have lifted/swollen and have broken away the floor screed.
Phil