Waterproofing
Polyurethane (PU) waterproofing for roofs, balconies and bathrooms
Liquid polyurethane cures into a seamless, highly elastic membrane that follows any surface shape — the familiar solution for roof slabs, balconies and bathrooms.
Polyurethane (PU) products
KeshunKeshun Aquacoat KS-929CSingle-component liquid-applied polyurethane membrane TDS · 35 pages
KeshunKeshun Aquacoat 680Weathering-grade polyurethane membrane for exposed use TDS · 7 pages
KeshunKeshun Aquaseal HW-307Water-based aliphatic polyurethane, UV-resistant TDS · 7 pages
KeshunKeshun FL1101Two-component solvent-free epoxy primer TDS · 7 pages
BuildmixBuildmix Flexseal PU S868Water-based single-component polyurethane TDS · 3 pages
BuildmixBuildmix Polyurethane PU-2KTwo-component polyurethane waterproof coating TDS · 6 pages
BuildmixBuildmix Epoxy Primer EP-2KTwo-component epoxy primer TDS · 5 pagesSummary table
| Product | Material type | Consumption | Packaging | Documents |
|---|---|---|---|---|
| Keshun Aquacoat KS-929C | Single-component liquid-applied polyurethane membrane | 1.6–1.8 kg/m² per 1 mm film (actual consumption depends on the substrate) | 25 kg pail | TDS · 35 pages |
| Keshun Aquacoat 680 | Weathering-grade polyurethane membrane for exposed use | — | 20 kg pail | TDS · 7 pages |
| Keshun Aquaseal HW-307 | Water-based aliphatic polyurethane, UV-resistant | Protective top coat: 0.8 kg/m² per coat (about 0.3–0.5 mm) | 20 kg pail, grey | TDS · 7 pages |
| Keshun FL1101 | Two-component solvent-free epoxy primer | 0.25–0.35 kg/m² | 25 kg set: component A 20 kg + component B 5 kg | TDS · 7 pages |
| Buildmix Flexseal PU S868 | Water-based single-component polyurethane | 0.2 kg/m² per coat | — | TDS · 3 pages |
| Buildmix Polyurethane PU-2K | Two-component polyurethane waterproof coating | 1.40–1.50 kg/m² per 1 mm film; apply 2–3 coats | Component A: 18 kg/pail (various colours); component B: 5 kg/pail | TDS · 6 pages |
| Buildmix Epoxy Primer EP-2K | Two-component epoxy primer | Theoretical 120 g/m² | 4 L set: A 3.5 kg + B 0.7 kg | TDS · 5 pages |
Polyurethane (PU) waterproofing is a liquid material that cures into a seamless elastic membrane with no joints. Single-component grades are moisture-curing and ready to use out of the pail, applied by notched trowel, squeegee or roller.
A complete PU system typically comprises an epoxy primer for adhesion, two PU coats applied at right angles to each other, and a UV-resistant top coat where the membrane stays exposed. VNA supplies all these layers from Keshun, with Buildmix alternatives.
Frequently asked questions
What is the consumption of PU waterproofing in kg/m²?
It depends on the product and the required film thickness. For Keshun Aquacoat KS-929C the technical data sheet states 1.6–1.8 kg/m² per 1 mm film; actual consumption depends on the substrate.
Can a PU membrane be left exposed?
Standard PU membranes need a UV-resistant top coat or a protection layer when exposed. Keshun Aquacoat 680 is a weathering-grade PU used directly on exposed surfaces such as concrete roofs, metal roofs and terraces.
Need polyurethane (pu) advice for your project?
VNA helps select materials, prepares submittal dossiers and guides application on site.