Watco Epoxy Damp Proof Membrane

Watco Epoxy Damp Proof Membrane holds back rising damp on new or old concrete and sand and cement floors.

Best Uses

Watco Epoxy Damp Proof Membrane is recommended for use on interior concrete floors that are subject to rising damp, new or old concrete floors where a DPM has failed or was never installed, or on areas of damp concrete which cannot be surface dried prior to painting. It is suitable for use on heavy wear areas, and can be over painted after 16 hours with most types of floor coatings.

Application

Concrete & sand and cement screed: Should be sound, clean and free of any contaminants that are liable to prevent penetration into the substrate or adhesion to the surface. Machine scarifying or shot blasting are ideal ways to clean and prepare large areas of concrete and remove contaminants. Finally, use a vacuum to remove all surface dust. 

Very smooth or power floated concrete: Should be shot blasted to provide a good key for the Epoxy Damp Proof Membrane to bond to. Use a vacuum to remove all surface dust.

Underfloor heating systems: Should be switched off at least two days prior to the application of Epoxy Damp Proof Membrane and left for a minimum of two days before switching back on. Once switched on, the underfloor heating should gradually be turned up a few degrees at a time.

Mixing

The product comprises a resin and curing agent packed in a plastic container. Remove the lid from the container and remove the ‘top chamber’ which contains the curing agent. Tip the contents of the top chamber into the container, mixing with the resin. Mix thoroughly using a wide bladed tool – a piece of batten is ideal. Scrape around the sides and bottom of the container to ensure the product is well mixed. This is fine for a small number of units. If you have multiple packs to mix we recommend a paint stirrer in a slow speed electric drill.

Application

Important: Once the contents of the pack have been mixed, a chemical reaction takes place which creates heat, and the product should therefore be decanted into a roller tray and used immediately. 

Best results are obtained in warm (minimum of 15°C), dry conditions with good ventilation. Apply with a medium pile roller, (not foam), working well in the surface of the concrete. One thick (250 microns) coat is usually sufficient. The coating should cover the substrate leaving no pin holes or missed patches. Most reasonable quality new concrete will cover successfully with one coat. Inspect the surface once the first coat has dried. Apply a second coat to cover any patches which may have been missed or where trapped air has caused pinholes. The product contains special wetting agents which help prevent air bubbles forming on most concrete surfaces.

Repairs/Resurfacing: If the intention is to apply a floor screed or resurfacer, such as Watco Flowtop®, or Concrex® to the Epoxy Damp Proof Membrane then two coats are required. Please blind the second coat with dry sand to provide a key for the overlay material.