BRANZ recommends the installation of a DPM for all habitable (e.g. houses) and non-habitable (e.g. offices, garages) buildings constructed with a concrete slab on ground.
The purpose of a damp-proof membrane (DPM) or concrete underlay is to prevent water and water vapour passing from the ground through a concrete slab and into the interior of the building and damaging interior finishes, fittings and contents.
This bulletin outlines the specification and installation requirements for DPMs and covers:
Publication date: February 2006 Keywords: concrete, foundations, moisture