Hi I would like to build a sunroom at the rear of my house but the ground is
200mm higher than the dpc at its highest point i can not go any further down as it is solid rock can I put a dpm down under a concrete slab 6m by 5m
200mm higher than the dpc at its highest point i can not go any further down as it is solid rock can I put a dpm down under a concrete slab 6m by 5m
