Description
Davco K10 Plus is a premixed, ready-to-use, water-based polyurethane waterproofing membrane for tradies and builders, supplied here as a 20L pail in grey. It is a Class III membrane designed to sit under tile, stone and other resilient finishes on both walls and floors, in domestic and commercial jobs.
About the formula
A one-part, water-based polyurethane that goes on straight from the pail with no mixing. It is rated Class III under AS/NZS 4858 and is highly flexible, with elongation above 500%. The manufacturer also lists it as non-toxic, UV stable and suitable as an anti-fracture membrane. Because it is water-based and solvent-free, it suits confined areas. Published technical figures include a Shore A hardness of 72 and a tensile strength of 2.1MPa.
Where to use it
Indoors: walls and floors in showers, bathrooms and other wet areas, ahead of tiling.
Outdoors: terraces, balconies, roofs and walkways that will be covered with a hard finish such as tile.
Suitable substrates include concrete, cement render and screeds, lightweight blocks, building boards approved for wet areas (such as compressed fibre cement sheet) and prepared metal surfaces. Metal needs an etching primer. All substrates should be primed with a suitable Sika primer before the membrane goes on.
How to use it
Prepare the substrate so it is sound, clean and primed. New render or screed needs a wood float finish and should cure before you start. Where falls are not already in place, form them with a sand and cement screed first. Apply the membrane by brush or roller in a minimum of two coats to reach a 1mm dry film. Each coat should go on at a wet film thickness of at least 0.75mm. Let the first coat dry for about 1 to 2 hours, then apply the second coat at 90 degrees to the first. Add further coats if needed to reach the minimum dry film thickness. Tools can be cleaned with water while the product is still wet. Tile over the cured membrane using a Sika polymer-modified cement-based tile adhesive.
Important notes
Allow about 6 to 8 hours before tiling or applying other finishes. Allow 3 days before flood testing and 5 days before the area returns to service. Drying times vary with temperature, humidity and film thickness. The membrane is not designed to be left exposed, so it must be covered with a finish. Follow the current Sika data sheet for primer selection, bond breakers, corners and joints, and for any movement joints. Wet area waterproofing must be done to the relevant Australian Standards and building code requirements, so use a licensed applicator where required. Shelf life is 12 months from manufacture. Store in a cool, dry place out of direct sunlight and do not let it freeze.
Specifications
| Brand |
Davco (Sika) |
| Product |
K10 Plus Waterproofing Membrane |
| Pack |
20L pail |
| Colour |
Grey |
| Base |
Water-based polyurethane, one part, premixed |
| Classification |
Class III (AS/NZS 4858) |
| Application |
Brush or roller |
| Elongation |
Greater than 500% |
| Coverage |
Approx. 13.3m² per 20L pail at two coats (1mm dry film) |
| Recoat time |
1 to 2 hours |
| Ready for tiling |
6 to 8 hours |
| Flood test |
After 3 days |
| Return to service |
5 days |
| VOC content |
62g/L |
| Shelf life |
12 months from manufacture |
| Use |
Interior and exterior, under tile, stone and other resilient finishes |
Safety
Even so, wear gloves and eye protection during application and keep the area ventilated, especially in enclosed spaces. Keep out of reach of children, avoid contact with eyes and skin, and do not let uncured product enter drains or waterways. Store the pail sealed, cool and out of frost. Refer to the Safety Data Sheet (SDS) for full details.
