Description
Davco K10 Plus is a 1-part, ready-to-use, water-based polyurethane waterproofing membrane rated AS/NZS 4858 Class III — the standard wet-area classification for showers, bathrooms, balconies, terraces and roof walkways prior to tiling with Davco cement-based adhesives. Because it’s water-based and solvent-free with a low VOC rating of 40g/L, it’s suitable for confined interior areas where a solvent-based membrane’s fumes would be a real site problem.
The two-coat system is central to how it performs: the minimum dry film thickness is 0.6mm for walls and 0.8mm for floors, achieved by two coats at 0.9L/m² for walls and 1.25L/m² for floors. A single coat won’t reliably reach that thickness, and balconies or patios finished with a hard floor covering need two heavier coats to reach the higher 0.8mm floor requirement everywhere, not just on average.
Technical Specifications
| Classification | AS/NZS 4858 Class III membrane |
|---|---|
| VOC content | Low VOC — 40g/L (SCAQMD method 304-91) |
| Coverage (wet areas, 2 coats) | 20L pail ≈ 22m² walls or 16m² floors |
| Coverage (balconies/patios, 2 heavy coats) | 20L pail ≈ 16m² floors |
| Curing time (single coat, 22°C) | 6-8 hours |
| Elongation | >500% |
| Tensile strength | 2.1MPa |
| Adhesion to concrete | 1.1MPa |
| Packaging | 4L or 20L pail (green), 20L pail (grey) |
Where to Use
- Showers, bathrooms, terraces, balconies, roofs and walkways prior to tiling
- Interior and exterior commercial and domestic walls and floors
- Concrete, cement renders, screeds, lightweight blocks, prepared metal and wet-area building boards
- Confined areas, as it’s water-based and solvent-free
How to Apply
- Prepare the surface — ensure it’s structurally sound, dry, clean and free from oil, grease, wax and loose material; prime concrete with Davco Ultraprime or PrimeX first.
- Apply the first coat — using a thick brush or short-nap roller, apply directly from the pail without mixing or thinning.
- Apply the second coat — after 1-2 hours drying time, apply at 90° to the first coat, checking for pinholes or air bubbles.
- Apply a third coat if required — only where needed for extra protection.
- Allow to cure — a minimum of 6 hours drying for the final coat before tiling, giving a total 6-8 hour cure depending on temperature.
Important Notes
- Do not apply above 35°C or below 5°C, and do not allow the product to freeze.
- Not suitable for areas of permanent water immersion such as swimming pools or spas.
- Not suitable where negative hydrostatic pressure (rising damp) is present — a different waterproofing product is needed in these conditions.
- All cracks and joints subject to movement must be treated with Davco K5 Bond Breaker and reinforcing tape before the membrane is applied.
