Description
RIW Cementfill HB High Build Waterproof Repair Mortar
RIW Cementfill HB is a high-performance, polymer-modified cementitious repair mortar designed for structural concrete repairs, profiling and waterproof rendering. Its thixotropic, rapid-hardening formulation allows high-build applications from 5mm to 80mm in a single layer on horizontal, vertical and overhead surfaces, whilst providing outstanding waterproof protection against both positive and negative water pressure.
Formulated with advanced microsilica, polymer and fibre technology, RIW Cementfill HB delivers exceptional bond strength, low shrinkage and excellent workability. Suitable for both concrete and masonry substrates, it is ideal for repairing damaged concrete, forming waterproof fillets and preparing surfaces before the application of waterproofing membranes. Once cured, it provides a durable waterproof barrier designed to last for the lifetime of the structure under normal service conditions.
Key Features & Benefits
- Polymer-modified waterproof repair mortar
- High-build application from 5–80mm per layer
- Waterproof against positive and negative water pressure
- Rapid hardening formulation
- Excellent bond strength
- Low sag for vertical and overhead applications
- Shrinkage compensated
- Suitable for damp substrates
- High compressive strength
- Easy trowel application
- Suitable for structural concrete repairs
- Ideal for forming waterproof fillets
- Single-component mix – just add water
- CE Marked to EN 1504-3
Applications
- Structural concrete repairs
- Masonry repairs
- Concrete rendering
- Surface profiling
- Basement waterproofing preparation
- Waterproof fillets
- Internal corners
- Vertical concrete repairs
- Overhead concrete repairs
- Concrete refurbishment
- Waterproof repair work
- Preparation before waterproof membranes
Technical Information
- Product Type: Polymer-modified cementitious repair mortar
- Colour: Concrete Grey
- Pack Size: 20kg
- Build Thickness: 5–80mm per layer
- Yield: 13.2 litres per 20kg
- Coverage: 2.64m² at 5mm thickness
- Working Time: Approx. 60 minutes at 20°C
- Application Temperature: +5°C to +35°C
- Compressive Strength:
- 1 Day: 23.5 N/mm²
- 7 Days: 41 N/mm²
- 28 Days: 48 N/mm²
- Flexural Strength (28 Days): 8 N/mm²
- Shelf Life: 12 months
- Suitable Substrates: Concrete and masonry
Frequently Asked Questions
What is RIW Cementfill HB used for?
It is used for structural concrete repairs, waterproof rendering, profiling surfaces and forming waterproof fillets before applying waterproof membranes.
Can it be applied to damp surfaces?
Yes. RIW Cementfill HB is designed to be applied to damp, saturated substrates without standing water.
How thick can it be applied?
It can be applied from 5mm up to 80mm in a single layer depending on the application.
Does it require a primer?
Concrete generally does not require priming. Highly porous substrates should be primed with a suitable primer before application.
Is it suitable for overhead repairs?
Yes. Its thixotropic, low-sag formulation makes it suitable for horizontal, vertical and overhead applications.
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