Fosroc Renderoc HB

Non Hazardous
A high performance lightweight concrete reinstatement mortar. Class R2.
Available in 24x 18 Kg bags (1/2 Pallet) and 48x 18 Kg bags (Full pallet)
From £1,046.30 £871.92
In stock
Product Description

Fosroc® Renderoc HB is a high performance lightweight concrete reinstatement mortar conforming to to the requirements of BS EN 1504-3 Class R2.

Best Uses

Fosroc Renderoc HB is used for the reinstatement of concrete where low permeability characteristics are required but where high compressive strength is not the most important consideration. If high compressive strengths and low permeability characteristics are required, Renderoc HB45 should be used.

Renderoc HB has been specifically developed for vertical and overhead repair work where its lightweight nature and high build characteristics makes it ideal.
Renderoc HB is suitable for repair methods 3.1, 3.3, 7.1, 7.2 as defined by BS EN 1504-3.

Renderoc HB is 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. It is based on Portland cements, graded aggregates, lightweight fillers and chemical additives which provide a mortar with good handling characteristics while minimising water demand.


The low water requirement ensures good strength gain and long-term durability. Renderoc HB has been specifically engineered for vertical and overhead repair work. It can be applied in sections up to 100mm 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. Renderoc HB can be quickly and efficiently applied by the wet spray technique. Consult our Technical Team for more information.

The material should not be applied at less than 10 mm thickness.

Technical Details


  • London Underground Approved: LUL APR No. 2183
  • Renderoc HB complies with LU Standard 1-085 ‘Fire Safety Performance of Materials’
  • Renderoc HB complies with the class R2 according to EN1504-3, repair methods 3.1, 3.3, 7.1 and 7.2.

Technical Info

Components: Single Pack
Type: Cementitious overlay
Stock Colours: Grey
Tintable: No
Application Method: Trowel
Theoretical Coverage: Approximately 14.5 - 15.0 Litres per 18kg bag (approximately 1.5 m2 at 10mm thickness)
Water Addition Per Bag: For normal applications, place 3.1 to 3.4 litres of drinking quality water into the mixer.
Compressive Strength:

EN 12190:1999. Class R2 > 15 MPa.

1 Day at 20°C = 10 MPa
28 Days at 20°C = 22 MPa

Minimum Thickness: Minimum Thickness 10mm, Overhead: up to 60mm, Vertical: Up to 100mm
Maximum Thickness: -
Placing: -
Cleaner / Thinner: Renderoc HB should be removed from tools and equipment with clean water immediately after use. Cured material can only be removed mechanically.
Shelf Life: 12 months if kept in a dry store in sealed bags. If stored in high temperature and high humidity locations the shelf life may be reduced to less than 6 months.
Packaging: Available in 24x 18 Kg bags (1/2 Pallet) and 48x 18 Kg bags (Full pallet)

The manufacturers data sheets are available for download from this website. It is your responsibility to read and understand all aspects of the data sheets before you place an order and prior to application. Please pay special attention to the preparation, mixing and application temperatures of the product, cleaning of substrate and environmental factors such as temperature, rain etc. Quoted coverage rates are based on the manufacturers theoretical rates and may vary depending upon substrates absorption, texture and application. We always recommend a test is carried out to ensure suitability.

Customer further agrees that Promain have no liability for any errors or omissions contained within the Product Data Sheets and are not liable for failure due to misapplication or inadequate substrate cleaning and preparation. For more information please refer to our Terms & Conditions.

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