Material Recipes & Design Mixes
PU (Polyurethane) Liquid Waterproofing System
Liquid-applied polyurethane membrane for exposed roofs and terraces. PU is a factory product — follow the manufacturer's data sheet; this is the typical application build-up and consumption.
Reference standards: ASTM C836, ETAG 005
| Layer | Consumption | Notes |
|---|---|---|
| PU / epoxy primer | 0.15–0.20 kg/m² | Moisture < 5% |
| PU membrane coat 1 | 0.8–1.0 kg/m² | |
| Reinforcing fabric | At joints, drains, corners | Polyester fleece |
| PU membrane coat 2 | 0.8–1.0 kg/m² | Total DFT ≥ 1.5 mm |
| Aliphatic UV top coat | 0.15–0.20 kg/m² | For exposed roofs |
Mixing & application
- Grind or sweep the slab; repair cracks and holes; check moisture content.
- Apply primer by roller and allow to tack (2–4 hours).
- Detail drains, upstands (150 mm minimum) and corners with membrane + fleece.
- Apply coat 1 by roller/squeegee; apply coat 2 at right angles after 12–24 hours.
- Apply UV top coat if exposed; protect from traffic for 72 hours.
- Do a 48-hour flood test before handover.
Acceptance criteria
- Continuous film, no blisters; DFT ≥ 1.5 mm.
- No leakage after 48-hour flood test.
Health & safety
- Wear PPE: helmet, safety shoes, gloves and eye protection.
- Solvents are flammable — ventilate, no naked flames.
FAQs
What is the PU (Polyurethane) Liquid Waterproofing System used for?
Liquid-applied polyurethane membrane for exposed roofs and terraces. PU is a factory product — follow the manufacturer's data sheet; this is the typical application build-up and consumption.
Which standard does it follow?
It is based on ASTM C836, ETAG 005. Always follow your project specification where it differs.
Can I print or submit this?
Yes. Use Print / PDF, add your project details and submit it through your normal approval process. Get it reviewed by your engineer or consultant first.
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General guidance only, not engineering advice. Project specifications, approved drawings, manufacturer data sheets and your consultant's instructions take priority. See our Policy. This document was generated using CM PRO. Powered by CM PRO.