Fosroc Renderoc GP

Product Overview

Renderoc GP is a ready-to-use blend of dry powders requiring only the site addition of clean water to produce a highly consistent, medium-weight repair mortar for general-purpose concrete and masonry repairs. Based on Portland cement, graded aggregates, special fillers, and chemical additives, modified with anti-desiccation additives for use in all climates. Maintains good handling characteristics while minimising water demand. Exhibits excellent thermal compatibility with concrete, and low water requirement ensures fast strength gain and long-term durability.

Features

• High Build Without Formwork — Achieves significant thickness on vertical and overhead surfaces without shuttering, saving time and cost
• Low Permeability — Effective barrier against carbon dioxide and chloride ingress, protecting concrete structures
• Excellent Bond — Strong adhesion to concrete substrates
• Shrinkage Compensated — Built-in shrinkage compensation reduces cracking risk after curing
• No Chloride Admixtures — Will not contribute to reinforcement corrosion
• Thermal Compatibility — Well-matched coefficient of thermal expansion with concrete
• Hot Climate Suitable — Anti-desiccation modified for good workability in high-temperature environments
• Chemical Resistant — Cured mortar resists acid gases, chloride ions, oxygen, and water
• Single Component — Just add water for quick and simple preparation

Applications

• Concrete Repair — General-purpose concrete patching and maintenance
• Masonry Reinstatement — Masonry structure repair and restoration
• Vertical and Overhead — Columns, beams, walls, and ceilings (without formwork)
• Patch Repair — All types of localised patch repairs
• Corrosion Protection — Areas requiring chloride and carbon dioxide resistance

Application Guide

• Surface Preparation — Saw-cut repair edges to avoid feathering; remove dust, oil, rust, and unsound material
• Steel Priming — Apply Nitoprime Zincrich (WB) anti-corrosion primer to exposed reinforcement
• Substrate Priming — Thoroughly soak substrate, then apply Nitobond SBR / cement slurry bond coat
• Mixing — Use forced-action mixer or suitable paddle with low-speed drill; free-fall mixers must not be used
• Application — Apply by gloved hand or trowel, compacting firmly
• Curing — Cure immediately after finishing with Nitobond AR or Concure WB spray membrane
• Protective Coating — Completed repairs can be overcoated with Dekguard anti-carbonation coatings

Packaging

25KG bag (single-component pre-blended powder, just add water)

Notes

• Not suitable for areas subject to vehicular traffic
• Do not use when the temperature is below 5 degrees and falling
• Do not mix part bags
• Exposure to heavy rainfall before final set may cause surface scour
• For multi-layer application, scratch-key intermediate layers and cure with Nitobond AR before repriming
• Can be finished with steel, plastic, or wood float, or damp sponge technique
• Shelf life of 9 months in original unopened bags stored in dry conditions (per manufacturer)
• Wear protective gloves, eye protection, and dust masks during application
• For detailed application methods, coverage rates, and technical parameters, refer to the official product data sheet

FAQ

How do I choose between Renderoc GP, HB40, LA55, and S?

GP is a general-purpose medium-weight repair mortar suitable for common concrete repairs. HB40 is a high-strength grade for structural repairs. LA55 is lightweight, ideal for large-area overhead ceiling repairs. S is a high-strength spray-grade option for large-area spray application. Select based on repair location and project requirements.

Can Renderoc GP be used on roads or driveways?

No. As a medium-weight formulation, the manufacturer explicitly states Renderoc GP should not be used in areas subject to vehicular traffic. For traffic-bearing repairs, please contact us via WhatsApp for suitable alternatives.

How much does Renderoc GP cost?

Please contact us via WhatsApp for the latest pricing. We offer in-store pickup in Mong Kok and delivery across Hong Kong.