Description
High Performance Fairing & Levelling Mortar
Fosroc Renderoc ST 05 is a high-performance, polymer modified cementitious protective coating, fairing and levelling mortar designed for applications from feather edge to 5mm thickness. Conforming to BS EN 1504-3 Class R4 requirements, it provides exceptional protection against carbonation, chloride ingress, water penetration and aggressive environmental conditions whilst delivering a smooth, durable finish.
Suitable for concrete, masonry, brickwork, blockwork and mild steel, Renderoc ST 05 can be applied to floors, walls and ceilings both internally and externally. It is ideal for reprofiling concrete surfaces, filling blowholes and imperfections, thin-section repairs, basement waterproofing applications and as a protective barrier coating for reinforced concrete structures.
Key Features & Benefits
- BS EN 1504-3 Class R4 compliant
- Polymer modified cementitious mortar
- Application from feather edge to 5mm
- Suitable for walls, floors and ceilings
- Can be applied vertically, horizontally and overhead
- Excellent bond strength without priming
- Carbonation barrier protection
- Chloride barrier protection
- High compressive strength
- Abrasion resistant finish
- Frost resistant
- Water pressure resistant
- Suitable for potable water structures
- Excellent wear resistance
- Can be left as a self-finish or overcoated
- Suitable for concrete and steel protection
Suitable Applications
- Concrete reprofiling
- Fairing and levelling concrete surfaces
- Blowhole filling
- Thin-section concrete repairs
- Basement wall lining
- Swimming pool preparation
- Marine structure protection
- Potable water tank lining
- Construction joint over-banding
- Balcony repairs
- Walkway repairs
- Reinforced concrete protection
- Steel beam protection
- Service penetration sealing
- Concrete cover restoration
Technical Information
- Product Type: Polymer modified fairing and levelling mortar
- Classification: BS EN 1504-3 Class R4
- Application Thickness: Feather Edge to 5mm
- Maximum Layer Build: 15mm (multiple layers)
- Fresh Wet Density: Approx. 1950 kg/m³
- Fire Rating: Class A2 s1 d0 Non-Combustible
- Packaging: 20kg powder + 5L liquid
- Coverage: Approx. 12 litres per pack depending on mix ratio
- WRAS Approved: Yes (after curing 21 days at 7°C)
Performance Data
Compressive Strength
- 1 Day: 13 MPa
- 3 Days: 26 MPa
- 7 Days: 37 MPa
- 28 Days: 50 MPa
Bond Strength
- Pull-Off Adhesion: 2.8 MPa
Flexural Strength
- 11 MPa at 28 Days
Abrasion Resistance
- 2785mg Weight Loss (EN ISO 5470-1)
Carbonation Resistance
- CO₂ Permeability: Sd = 57m
- Carbonation Barrier: <R(b) = 21mm at 2mm thickness
Frequently Asked Questions
What is Fosroc Renderoc ST 05 used for?
Renderoc ST 05 is used as a protective coating, fairing coat, levelling mortar and thin-section repair mortar for concrete, masonry and steel surfaces.
What thickness can it be applied at?
It can be applied from feather edge up to 5mm in a single layer, with a maximum total build-up of 15mm in multiple layers.
Can it be used in potable water tanks?
Yes. Renderoc ST 05 is WRAS approved when cured for 21 days at 7°C.
Is it suitable for trafficable areas?
Yes. It offers excellent abrasion resistance and can be used on balconies and walkways, although it is not recommended for heavily trafficked floors.
Can it be applied directly to steel?
Yes. It can be applied to properly prepared steel surfaces as a protective barrier coating.
Does it require a primer?
In most applications no primer is required, although very porous substrates may require treatment with diluted Nitobond AR.
Downloads
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Security
You may also be interested in
Recently viewed
What Our Customers Say