Primo Floor Screed Waterproof 303 – High Performance Cement-Based Floor Screed with Waterproofing
A high performance cement-based floor screed specially formulated with waterproofing polymers and additives. Ideal for wet and exterior areas requiring moisture resistance, durability, and crack protection. Excellent waterproofing properties.
Features
- Strong adhesion to concrete and masonry surfaces
- Smooth workability and easy application
- Crack resistant and long-lasting durability
- Suitable for bathrooms, balconies, rooftops, kitchens, parking garage, basement, and more
- Waterproof barrier with excellent bond strength
Advantages
- 2-in-1 Function: levelling screed + waterproof barrier
- Pre-mixed formulation: consistent quality, easy to apply, only add water
- Reduces risk of water leakage and efflorescence
- High durability and good weather resistance
- Suitable for interior and exterior use
- Can be applied from 10 mm up to 75 mm thickness in one layer
Technical Data
| Appearance | Grey premixed powder |
| Binder | Graded sand and cementitious with polymer modification |
| Mixing Ratio | Approx. 5.5 – 6.5 L water / 40 kg bag |
| Density (Wet Mix) | ~ 2.0 g/cm³ |
| Compressive Strength | ≥ 25 N/mm² at 28 days |
| Flexural Strength | ≥ 6 N/mm² |
| Bond Strength | ≥ 1.0 N/mm² |
| Waterproofing | Impermeable to water under 1 bar pressure |
| Thickness Range | 10 mm – 75 mm |
| Pot Life | Approx. 60 minutes at 25°C |
| Coverage | ~2.5 m² per 40 kg bag at 10 mm thickness |
| Curing Time | Light foot traffic: 24 hrs / Full cure: 7 days |
Application & Usage
- Surface Preparation: Substrate must be sound, clean, and free of dust, grease, or loose particles. Dampen substrate with clean water, but avoid standing water. Apply a bonding slurry coat for maximum adhesion.
- Mixing: Place 5.5–6.5 L clean water into a mixing container. Slowly add 40 kg of Floor Screed Waterproof 303 while mixing. Mix 3–5 minutes until homogeneous. Use mechanical mixer for best results.
- Application: Apply mixed mortar evenly. Compact and level using trowel/straight edge. For sloped screeds, ensure proper gradient. Protect from rain and rapid drying during curing.
- Packaging: 40kg moisture-resistant bags.
- Storage & Shelf Life: Store in a cool, dry place away from direct sunlight. Shelf life: 12 months in unopened packaging.
- Safety & Health: Keep out of reach of children. Use gloves, mask, and eye protection. In case of eye contact, rinse with water and seek medical attention if irritation persists. Refer to SDS before use.
* All technical data are based on laboratory tests. Actual data may vary due to circumstances beyond our control.
Frequently Asked Questions (FAQ)
It is ideal for wet and exterior areas such as bathrooms, balconies, rooftops, kitchens, parking garages, basements, and other spaces needing strong moisture resistance.
It offers strong adhesion to concrete and masonry, smooth workability, crack resistance, long-lasting durability, and forms a waterproof barrier with excellent bond strength.
It provides a 2-in-1 solution (levelling screed + waterproofing), comes pre-mixed for consistent quality, helps reduce leakage and efflorescence risks, is durable with weather resistance, suitable for interior/exterior use, and can be applied in one layer from 10–75mm.
Mix 40kg with about 5.5–6.5L of clean water for 3–5 minutes until homogeneous. Apply evenly, compact and level with a trowel/straight edge, and protect from rain or rapid drying during curing. Pot life is about 60 minutes at 25°C.
