Description
Lightweight Concrete Reinstatement Mortar
Fosroc Renderoc HB is a high-performance lightweight concrete repair mortar designed for vertical and overhead concrete reinstatement where low permeability and high build characteristics are required. Supplied as a one-component pre-blended powder, it requires only the addition of clean water to produce a durable repair mortar with excellent handling and long-term performance.
Developed specifically for non-structural concrete repairs, Renderoc HB combines lightweight fillers, graded aggregates and polymer modification to provide exceptional resistance to water, carbon dioxide and chloride ingress. Its lightweight formulation allows repairs up to 100mm vertically and 60mm overhead in a single application without formwork.
Key Features & Benefits
- Lightweight concrete repair mortar
- BS EN 1504-3 Class R2 compliant
- Suitable for vertical and overhead repairs
- High build application capability
- Low permeability to water and chlorides
- Excellent resistance to carbonation
- Polymer modified formulation
- Shrinkage compensated
- Frequently eliminates need for formwork
- One component pre-bagged system
- Suitable for wet spray application
- Excellent bond strength
- Non-combustible Class A2 s1 d0
- Chloride free formulation
- Long-term durability
- Easy mixing and application
Suitable Applications
- Concrete repair projects
- Vertical concrete repairs
- Overhead concrete repairs
- Concrete reinstatement
- Balcony repairs
- Soffit repairs
- Bridge repairs
- Car park repairs
- Concrete patch repairs
- Structural refurbishment projects
- Civil engineering repairs
- Marine and coastal concrete repairs
- Concrete repair methods 3.1, 3.3, 7.1 and 7.2
Technical Information
- Product Type: Lightweight concrete reinstatement mortar
- Classification: EN 1504-3 Class R2
- Colour: Concrete Grey
- Bag Size: 18kg
- Compressive Strength: 22 MPa at 28 days
- Bond Strength: 1.9 MPa
- Chloride Ion Content: 0.02%
- Initial Set: 3.5 hours
- Final Set: 5.5 hours
- Fresh Wet Density: 1430 kg/m³
- Minimum Thickness: 10mm
- Vertical Build: Up to 100mm
- Overhead Build: Up to 60mm
- Coverage: Approximately 14.5–15 litres per 18kg bag
- Yield: Approximately 1.5m² at 10mm thickness
- Fire Rating: Class A2 s1 d0 Non-Combustible
Standards & Certifications
- BS EN 1504-3 Class R2
- Repair Methods 3.1, 3.3, 7.1 and 7.2
- EN 13501-1 Class A2 s1 d0
- LU Standard 1-085 Fire Safety Performance of Materials
- CE Marked
- UKCA Marked
Frequently Asked Questions
What is Renderoc HB used for?
Renderoc HB is used for vertical and overhead concrete repairs where low permeability and high build capability are required.
How thick can it be applied?
It can be applied up to 100mm vertically and up to 60mm overhead in a single application.
Is Renderoc HB suitable for structural repairs?
No. It is classified as an EN 1504-3 Class R2 non-structural repair mortar.
Can it be spray applied?
Yes. Renderoc HB is suitable for wet spray application for larger repair projects.
What is the coverage per bag?
An 18kg bag yields approximately 14.5–15 litres of mortar and covers around 1.5m² at 10mm thickness.
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