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Fosroc Renderoc GP is a general purpose medium density concrete reinstatement mortar specifically engineered for vertical repair work and can also be used as a render coat, and suitable for repair methods 3.1, 3.3, 4.4, 7.1, 7.2 as defined by BS EN 1504-3.
Ideal for the reinstatement of concrete where low permeability characteristics are required but where high compressive strength is not the most important consideration.
Where higher compressive strengths and low permeability characteristics are required, Renderoc HB45 should be used.
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Features & Benefits
- Supplied as a ready to use blend of dry powders requiring only the site addition of clean water to produce a highly consistent, lightweight repair mortar
- Based on Portland cements, graded aggregates and chemical additives which provide a mortar with good handling characteristics while minimising water demand
- Low water requirement ensures good strength gain and long-term durability
- Compatibility with concrete of compressive strength 20 - 35 N/mm²
- Frequently obviates the need for formwork
- Extremely low permeability to water, carbon dioxide and chlorides
- Exceptional system of shrinkage compensation provides long-term dimensional stability
- Can be applied quickly and efficiently by wet spraying
- One component, pre-bagged to overcome site-batched variations
- Contains no chloride admixtures
Uses
- Specifically engineered for vertical repair work
- Can be applied in sections up to 70 mm thickness in vertical locations and up to 60 mm thickness in overhead locations in a single application and without the use of formwork
- Thicker sections can be achieved by the use of formwork or can be built up in layers
- Deep pockets can sometimes be filled in a single application dependent on the configuration of the pocket and the volume of exposed reinforcing steel
- Can be quickly and efficiently applied by the wet spray technique
Application Notes
- Reinforcing steel can be primed with one full coat of Nitoprime Zincrich Plus prior to application
- Concrete can be primed by scrubbing Nitobond HAR into the surface
- In exceptional circumstances, e.g. where a substrate/repair barrier is required or where the substrate is wet or likely to remain permanently damp, Nitobond EP bonding aid should be used
- A forced-action mixer is essential. Mixing in a suitably sized drum using an approved Renderoc Mixing Paddle (MR4) with a slow speed (400/500 rpm) heavy-duty drill is acceptable for the occasional one-bag mix
- Apply by gloved hand or trowel
- Additional build-up can be achieved by application of multiple layers. The surface of the intermediate layers should be comb scratchkeyed and cured with Nitobond AR
- Renderoc GP can be quickly and efficiently applied by the wet spray technique. In circumstances where large areas of repair are required, the rapid placement and higher build attainable by this method offer economic advantages over hand-trowelling. The resultant repair also offers a generally more dense compound with enhanced mortar/substrate bond characteristics
- In cold conditions down to 3°C, the use of warm mixing water (up to 30°C) is advisable to accelerate strength development. At ambient temperatures above 35°C, the material should be stored in the shade and cool water used for mixing
- The use of Nitobond AR, sprayed on to the surface of the finished mortar in a continuous film, is recommended. A low pressure atomising sprayer is essential for applying the Nitobond AR
- Large areas should be cured as trowelling progresses (0.5 m2 at a time) without waiting for completion of the entire area
- Dekguard products may be applied over the repair area without prior removal of the Nitobond AR curing membrane
- Should be removed from tools, equipment and mixers with clean water immediately after use. Cured material can only be removed mechanically
- Yield: Approximately 16 litres / 25 kg bag (approx. 1.6 m² at 10 mm thickness)
- The material should not be applied at less than 10 mm thickness
Note: the actual yield per bag will depend on the consistency used. The yield will be reduced if the material is applied by a spray technique.
Limitations
- Should not be used when the temperature is below 3°C and falling
- Free-fall mixers must not be used. Mixing of part bags should never be attempted
- Due to the nature of Renderoc GP, the product should not be used in areas subjected to traffic (in these circumstances, Renderoc S should be considered)
- Should not be exposed to moving water during application
- Exposure to heavy rainfall prior to the final set may result in surface scour
- Renderoc GP is non-flammable
- As with other ‘one pack’ repair mortars, Renderoc GP may exhibit satisfactory handling characteristics even though inadequately mixed. This will result in a significantly lower level of performance or possible failure. It is therefore essential that mixing instructions are strictly adhered to with particular emphasis on the quantity of water used and the time of the mixing operation
Data sheet
- Manufacturer
- Fosroc
- For Use By
- Professional Use
- For Use On
- Concrete
- Application Method
- Gloved hand or trowel
- Single, Two or Three Pack
- Single
- Pack Size
- 25KG
- Minimum Applied Thickness
- 10mm
- Maximum Applied Thickness
- 60mm (Overhead)
70mm (Vertical) - Coverage
- Approximately 16 litres / 25 kg bag (approx. 1.6 m² at 10 mm thickness)
- Recommended Thinner/Cleaner
- Water
- Flexural Strength (at 20°C)
- 7.1 MPa@ 28 days
- Shelf Life (from date of manufacture)
- 12 months
- Resistance to chemicals
- The low permeability of Renderoc GP severely retards chemical attack in aggressive environments. The cured mortar is impermeable to acid gases, waterborne chloride ions and oxygen.
- Drying time
- Initial set: 3 1/2 hours
Final set: 4 hours - Compressive Strength
- Class R3: ≥ 25 MPa
- Suitable For Use On
- Concrete
- Application Method
- Trowel
- Application Method
- Hand
- Manufacturer
- Fosroc
- Usages
- Cementitious Repair Systems
- Product Usage Type
- Mortar
- Product Range
- Renderoc
Questions
Question about the product
David Tomlinson on 2022-05-24 09:28:45 | Question:
We cut a new roof hatch opening through 180mm reinforced concrete which has left with a clean cut. (800 x 1.500) Would you recommend any early preparation before applying Renderoc GP |
Answer from Rawlins’ Technical Team:
For application of this product to concrete the area should be square edged and not feathered, the minimum depth must be 10mm. Clean the surface and remove any dust, unsound or contaminated material, plaster, oil, paint, grease, corrosion deposits or algae. Where breaking out is not required, roughen the surface and remove any laitance by light scabbling or abrasive-blasting. Oil and grease deposits should be removed by steam cleaning, detergent scrubbing or the use of a proprietary degreaser. The effectiveness of decontamination should then be assessed by a pull-off test. The concrete substrate should be saturated surface dry immediately before the application of the primer i.e. it should be thoroughly saturated with clean water and any residual surface water removed prior to applying Fosroc Nitobond HAR. Under severe drying conditions repeated soaking may be necessary to ensure the substrate is still saturated at the time of application of the primer. Scrub Fosroc Nitobond HAR into the surface. Renderoc GP can be applied as soon as the primer becomes tackey. If the Fosroc Nitobond HAR is too wet, overhead and vertical build up of the Renderoc GP may be difficult. In exceptional circumstances, e.g. where a substrate/repair barrier is required or where the substrate is wet or likely to remain permanently damp, Fosroc Nitobond EP should be used. | |
IMPORTANT SHIPPING & DELIVERY INFORMATION
Fosroc Renderoc GP is only available with the shipping and delivery timescales listed below - please do not contact our Customer Support Team with enquiries about alternative or earlier shipping and delivery times.
Saturdays and Sundays, as well as Bank Holidays, are not classed as working days.
Orders placed after the cut-off for this product will not be processed for earliest dispatch until 9am the next working day.
All delivery costs below are excluding VAT
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