How to use damp-proof membranes for floors

Damp-proof membranes protect building structures against damp. Whether it’s penetrating damp, residual construction moisture or — in rare instances — rising damp, it’s important that the underlying issues are addressed and fixed before any refurbishment or redecoration is carried out. Some areas where a damp-proof membrane is advised include underfloor heating and bathroom floors.

weberfloor DPM Pro offers damp proofing for concrete floors and cement based levelling compounds using an easy two-coat system. An effective liquid damp proof membrane resistant to a wide range of chemicals, it is used for oversealing cementitious surfaces which contain high levels of residual moisture. It also permits early overlaying with vinyl, carpets and resin based products after the addition of a floor screed or levelling compound, and it can be used down to 5°C, allowing work to continue during winter.

Take a look at our quick guide below on the best way to use weberfloor DPM Pro to damp-proof your floors.

1. Prepare substrate

weberfloor DPM Pro can be applied on substrates such as concrete and cement-based levelling compounds. All surfaces must be mechanically sound, dry and clean, i.e. free from dirt, dust, grease or other contamination or coating. Laitance must also be removed from concrete.

2. Mix

weberfloor DPM Pro is supplied in 2 pre-mix tin packaging (Component A = resin base and Component B = hardener) with the specific mixing ratio for use. Pour the entire contents of the hardener container (Component B) into the resin container (Component A) and blend the two materials meticulously for a minimum of 2-3 minutes. 

3. Apply

After blending, apply the mixture onto the floor promptly as the self-heating within the container will decrease the available working time. Apply weberfloor DPM Pro onto the substrate using a medium pile roller.

In order to achieve the stated performance, it is essential that weberfloor DPM Pro is applied in all areas at a minimum thickness of 250μm, measured with a wet film thickness gauge, and that full coverage is achieved with a pinhole free finish. If this is not achieved than an additional coat of weberfloor DPM Pro should be applied once the first coat has set which will take approximately 2-3 hours depending on site conditions.

Apply east to west, before over rolling north to south, ensuring a continuous, pinhole free finish is achieved.

The second coat of weberfloor DPM Pro can receive a full scatter of appropriate kiln-dried sand, using 1-2mm.