An impervious membrane should always be applied as a Damp Proof Membrane (DPM) above or below a ground floor slab to stop ground moisture reaching the upper surface of the floor.
Applying Damp Proof Membranes
DPM’s can be applied to either a suitable blinding layer under the slab or internally to the top of the slab. Consideration should be given to applying the DPM to the top of the slab, as the installation and moisture sensitive internal finishes are then protected from any residual moisture in the concrete.
Find a suitable waterproofing solution for this or any application below:
