WPA 260
Single component vapour barrierÂ
WPA 260 is a uniquely formulated single component vapour barrier for use over concrete and cementitious screeds to prevent blistering and delamination of the WPA range of water-based membranes associated with residual dampness within the substrate.
Unlike traditional vapour barriers, WPA 260 will not change the surface profile, ensuring the membrane bonds as designed.
Recommended for:
• Damp or green concrete
• Green cementitious screeds
• Green cementitious render
• Damp masonry block work
Size: 10 Litres
- Forms a vapour barrier against residual moisture.
- Fast drying, enabling membrane application after only one hour.
- Can be applied over damp and green concrete or cementitious screeds.
- Water resistant.
- Unique colour changing formulation indicating when product is ready for overcoating.
- Designed to be used with the WPA range of water-based membrane systems on porous surfaces.
WPA 260 Vapour Barrier FAQs
Choosing the correct vapour barrier is essential for successful waterproofing over damp or newly constructed substrates. This FAQ section answers common questions about WPA 260, including when it should be used, suitable substrates, drying times, and how it helps support long term waterproofing membrane performance in commercial and residential applications.
WPA 260 is designed to help manage residual moisture in damp or green concrete and cement based substrates before waterproofing. It forms a vapour barrier that helps reduce the risk of blistering and membrane delamination caused by trapped moisture.
Yes. WPA 260 is specifically formulated for use over damp or green concrete, screeds, render, and masonry blockwork. This allows waterproofing works to continue sooner without needing to wait for the substrate to fully dry.
Green concrete contains residual moisture that can affect the performance of waterproofing membranes if applied too early. Applying a suitable vapour barrier before waterproofing can help manage moisture within the substrate. WPA 260 is specifically designed for use over green concrete, helping reduce the risk of blistering and membrane failure caused by trapped moisture.
Blistering is commonly caused by moisture vapour becoming trapped beneath a waterproofing membrane. As moisture moves through concrete or cement based substrates, pressure can build beneath the membrane and lead to blistering, lifting or delamination over time. Using a vapour barrier such as WPA 260 can help reduce this risk before waterproofing membranes are applied.
Under normal conditions, WPA 260 dries in approximately one hour before waterproofing membranes can be applied. Drying times may vary depending on temperature, humidity, and substrate porosity.
WPA 260 includes colour change technology to make application easier on site. It applies milky white, transitions to a green tinge, and dries clear when it is ready for overcoating with a compatible WPA membrane system.
No. WPA 260 is designed to manage residual moisture within concrete and cementitious substrates only. It is not suitable for rising damp, active moisture, or negative hydrostatic pressure situations. WPA 560 Moisture & Vapour Barrier should be used for those applications.
WPA 260 is suitable for porous mineral substrates including concrete, cement screeds, render, and masonry blockwork. Dense or steel floated concrete surfaces may require mechanical abrasion to improve absorption and adhesion.
No. WPA 260 is supplied ready to use and should be applied neat without dilution. It can be applied by brush or medium nap roller to achieve full coverage.