Sika Ronacrete Monoprufe RTU 801
Sika Ronacrete Monoprufe RTU 801
Monoprufe RTU 801 is a single-component, water-based modified polyurethane waterproofing membrane by Sika Ronacrete. UV resistant, no discolouration or yellowing. Elongation >300%, tensile strength >2.5 MPa. For flat roofs, external walls, metal roofs, decks, and canopies. 20 kg drum, 12-month shelf life.
Monoprufe RTU 801 — UV Resistant High Elasticity Polyurethane Waterproofing Membrane
Monoprufe RTU 801 is a highly versatile single-component water-based modified polyurethane waterproofing membrane with excellent elasticity and high technical performance. Suitable for application onto damp or dry concrete, stone, metal, asphalt, and wood. UV resistant, solvent-free, with no discolouration or yellowing over time. Supplied pre-blended and ready to use, with a long pot life ideal for large areas and surfaces with complicated details such as behind curtain walls and cladding systems.
Key Features
- Single-component water-based modified polyurethane, pre-blended and ready to use
- Elongation >300%, tensile strength >2.5 MPa — excellent elasticity
- Tear strength >20 kN/m
- UV stable — no discolouration or yellowing
- Solvent free, low VOC (21 g/L)
- Solid content >60% by weight
- Strong adhesion to concrete, metal, asphalt, stone, and wood
- Long pot life suitable for large and complex areas
- Available in grey and white, with other colours on request
Typical Applications
- Flat roofs and metal roofs
- External walls and curtain wall systems
- Decks and canopies
- Areas with complex architectural details
Why Choose Monoprufe RTU 801?
- Ultra-high elasticity: >300% elongation effectively bridges cracks and accommodates structural movement
- UV resistant: Maintains appearance and performance under prolonged sun exposure without a topcoat
- Low VOC: Water-based formula at 21 g/L VOC, safe for indoor and outdoor use
- Ready to use: Pre-blended, just stir lightly and apply
- Multi-substrate: Suitable for concrete, metal, asphalt, stone, and wood
Packaging & Consumption
| Item | Specification |
|---|---|
| Packaging | 20 kg drum |
| Colour | Grey and White (other colours available on request) |
| Shelf Life | 12 months from date of production |
| Storage | Unopened original sealed packaging, 5°C to 35°C, protect from sunlight and frost |
Consumption Guide
| Application | Rate per Coat | Recommended Coats | Total |
|---|---|---|---|
| Roof waterproofing | ~1 kg/m²/coat | 2-3 coats | ~2 kg/m² |
| Wall waterproofing | ~0.75 kg/m²/coat | 2-3 coats | ~1.5 kg/m² |
| Primer (porous substrates) | ~0.3 kg/m² | 1 coat | — |
Actual consumption varies with surface porosity and texture.
Technical Specifications
| Property | Value | Test Standard |
|---|---|---|
| Chemical Base | Polyurethane acrylic copolymer | — |
| Density | 1.2 +/- 0.1 kg/L | — |
| Solid Content | >60% by weight | — |
| Tensile Strength | >2.5 MPa | ASTM D412 |
| Elongation at Break | >300% | ASTM D412 |
| Tear Strength | >20 kN/m | ASTM D624 |
| VOC | 21 g/L | USEPA Method 24 |
| Ambient Temperature | >5°C | — |
Important Notes
- Substrate must be sound, dry, clean, free of oil and removable contaminants
- Open-textured mortar or concrete should be primed with diluted Monoprufe RTU 801 (1 part product to 3 parts water) or Sikalastic-500 Acrylic Primer HK at ~0.3 kg/m²
- New concrete must cure for 28 days before application
- After rain, allow substrate to dry for 3 days before application
- Use fibre-reinforced detailing coat over open joints, corners, and stress points
- Product is pre-blended; slight separation after storage is normal and can be corrected by gentle re-mixing
- Clean tools with water immediately after use
FAQ
How does Monoprufe RTU 801 compare to standard acrylic waterproofing paint?
Monoprufe RTU 801 is a polyurethane acrylic copolymer with >300% elongation, far exceeding standard acrylic waterproofing paints (~100% elongation). This high elasticity effectively bridges cracks and accommodates structural movement. It is also UV stable without yellowing, making it ideal for exposed roofs and external walls.
Is a primer coat required?
Porous or open-textured concrete and mortar substrates should receive a primer coat (Monoprufe RTU 801 diluted 1:3 with water, or Sikalastic-500 Acrylic Primer HK) at approximately 0.3 kg/m². Smooth or non-porous substrates can be coated directly.
What is the consumption rate per square metre?
For roof waterproofing, approximately 2 kg/m² (2 coats at 1 kg/m² each). For wall waterproofing, approximately 1.5 kg/m² (2 coats at 0.75 kg/m² each). Actual consumption depends on substrate porosity and roughness.
