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ROOFCOAT PU 2K is a two-component, cold-applied, self-curing polyurethane-cement hybrid elastomeric waterproof membrane. Compliant with EN 1062-3 and EN 1504-2, it combines chemical bonding (polyurethane) with hydraulic bonding (Portland cement) to deliver 5-bar water resistance, NIL chloride permeability (ASTM C 1202), and 150% elongation. Recommended for under-tile wet areas, water-retaining structures and infrastructure concrete protection.
Figures are controlled laboratory results. Actual site performance varies with substrate, temperature, humidity, application method and workmanship — please confirm the current product datasheet before specification.
ROOFCOAT PU 2K is a PU cement waterproofing membrane in two parts: Part A is liquid polyurethane and Part B is cement. Mixed 1:2 by weight, it becomes a cold-applied, self-curing elastomeric coating. This hybrid waterproofing membrane is applied in two coats by brush, roller or notched trowel on a pre-wetted surface.
Recommended under tiles, with a 3–5 day air cure before tiling.
Two crosswise coats applied on a pre-wetted surface.
Elastomeric membrane with elongation at break above 150%.
NIL water penetration at 5 bar for water-retaining structures.
Air cure a minimum of 3–5 days before water contact.
Protects concrete with a polyurethane and cement hybrid membrane.
Brush, roller or notched trowel application, with optional fibre mesh.
NIL chloride permeability protects reinforcement from chloride-induced corrosion.
For bathroom leakage repair or a new wet area, 1 kg covers 6–8 sq.ft in 2 coats at 1.55 mm DFT. Tensile strength is 5.0–5.5 N/mm² and Shore A hardness is 85 or more. It complies with EN 1062-3 and EN 1504-2, and as a chloride resistant waterproofing it shows NIL chloride permeability to ASTM C 1202. Up to 20% water by weight of Part A may be added. Use the mixed product within 30 minutes at 30°C, and recoat after 2–6 hours.
Armstrong Chemicals supplies ROOFCOAT PU 2K to sites across Telangana, Andhra Pradesh, Karnataka, Kerala and Tamil Nadu, including Hyderabad, Vijayawada, Bengaluru, Kochi and Chennai.
Chemical adhesion from the polyurethane resin combines with hydraulic bonding from Portland cement, giving excellent adhesion to concrete.
The polyurethane gives the cured membrane the elasticity of a PU coating, with elongation at break above 150%.
No chloride ions migrate through the cured membrane, which protects embedded reinforcement in marine, coastal and water-retaining structures.
A two-component, cold-applied, self-curing PU-cement hybrid membrane compliant with EN 1062-3 and EN 1504-2. Chemical bonding from PU chemistry combined with hydraulic bonding from Portland cement — for wet areas, under-tile applications and reservoirs.
Get a QuotePart A (1 kg liquid polyurethane) + Part B (2 kg Portland cement with aggregates) + up to 20% water. Delivers both chemical adhesion (PU) and hydraulic bonding (cement) to the substrate.
The only Armstrong coating with the European EN 1504-2 concrete surface protection standard — combined with EN 1062-3 capillary absorption compliance for infrastructure specifications.
NIL chloride permeability per ASTM C 1202 — protects embedded reinforcement from chloride-induced corrosion. NIL water penetration at 5 bar (BS EN 12390). 0.01 kg/m²·h⁰·⁵ capillary absorption (EN 1062-6).
Recommended by the brochure for use beneath tile beds in kitchens, bathrooms, balconies and terraces — with fibre mesh or GEO fabric for reinforced-system specifications.
⚠️ Use mixed product within 30 minutes at 30°C. Apply the second coat crosswise after the first has hardened (2–6 hours). After application, air-cure for a minimum of 3–5 days to allow full cement hydration. Do not apply in direct sun or strong wind; protect from freezing and rain during cure.
Unlike pure PU or pure cement membranes, ROOFCOAT PU 2K combines both — for wet areas, under-tile applications and water-retaining structures.
The only Armstrong coating carrying the European EN 1504-2 concrete surface protection standard — combined with EN 1062-3 capillary absorption compliance. Infrastructure-grade specification.
NIL water penetration at 5 bar (BS EN 12390). NIL chloride permeability (ASTM C 1202) protects reinforcement from chloride corrosion in marine, coastal and water-retaining applications.
Recommended for wet area under-tile membranes in kitchens, bathrooms, balconies. Can be reinforced with fibre mesh or GEO fabric for high-movement or extended-warranty specifications.
⚠️ 30-minute pot life at 30°C — use fast. Minimum 3–5 days air curing after application is essential for full cement hydration and the stated 5.0–5.5 N/mm² tensile strength.
Prepare substrate — remove all dust, oil, laitance, loose particles; repair cracks and honeycombs
Pre-wet the substrate to saturated surface dry (SSD) condition — no standing water
Add Part A (liquid PU) into a clean container; slowly add Part B (cement) at 1:2 by weight while mixing with a low-speed drill (300–500 rpm)
Add up to 20% water (by weight of Part A) to achieve workable consistency; mix 3–4 minutes until lump-free
⚠️ Use mixed product within 30 minutes at 30°C
Apply the first coat by brush, roller or notched trowel; optional fibre mesh / GEO fabric embedment in first coat
Apply second coat crosswise after first hardens (2–6 hours)
Air cure a minimum of 3–5 days before water contact, tiling or foot traffic
Do not apply in direct sun, strong wind, or when rain is imminent; protect from freezing during cure
Full specifications, application systems, layering guides, and coverage tables.
Request a quote and your nearest Armstrong distributor will contact you directly.
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