The DPC in the inner wall is usually below floor level, (under a suspended timber floor structure), or, with a solid concrete floor, it is usually found immediately above the floor slab so that it can be linked to the DPM under the floor slab. This enables installation of skirting boards above floor level without fear of puncturing it.
The placement of the DPC (damp proof course) within a wall depends on the flooring structure. It's positioned below the floor level in a timber-framed structure and directly above the floor slab in a concrete-floored structure to ensure proper connection with the DPM for moisture protection.