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When it comes to securing heavy machinery or equipment, ensuring a strong and durable foundation is crucial. This is where epoxy grouts, such as the Conbextra Epoxy Grouts by Fosroc®, play a pivotal role. In this guide, we will delve into the application, installation, and key considerations for using epoxy grouts effectively.

What is Epoxy Grout and What is It Used For?

Epoxy grout stands as a high-performance, specialized grouting material formulated with epoxy resin as its key component. What sets it apart is its exceptional strength and durability, making it a cornerstone in industrial settings. Its primary purpose lies in securing heavy machinery and equipment. Unlike conventional cement-based grouts, epoxy grout forms an unyielding bond, ensuring a stable and secure foundation. This robust connection minimizes the risk of shifts or structural issues, especially under the weight and movement of heavy machinery. Industries ranging from manufacturing to construction rely on epoxy grout to provide an unshakable base for critical machinery, thereby enhancing safety, longevity, and operational efficiency.

Application of Conbextra Epoxy Grouts

Epoxy grouts are specifically designed to provide exceptional bond strength and tensile strength, making them ideal for anchoring bolts in heavy machinery installations. Unlike typical cement-based grouts, epoxy resin-based grouts offer superior performance, ensuring a secure foundation.

Installing Conbextra Grouts

Preparation of the Foundation

Before applying the epoxy grout, thorough preparation of the concrete foundation is essential. This involves removing the laitance layer, a weak surface layer, without causing damage to the underlying concrete. The result should be a surface with approximately 50% clean aggregate, free from dust or loose material.

Effective methods for preparation include scabblers and chipping guns, which remove the cement matrix without disrupting the aggregate. For larger areas, captive blast machines offer an efficient solution.

Machine/Baseplate Installation

Proper installation of the baseplate is crucial. It should be positioned and leveled to the required height, leaving a gap for grouting. Various methods, such as threaded bolts with two nuts or leveling screws (bolts), can be employed. The latter method allows for post-tensioning, ensuring a secure fit.

Anchor Bolts

When grouting anchor bolts, epoxy resin-based grouts or specialized anchoring products are recommended for their superior bond strength. It’s important to fill anchor pockets separately from the general grout application to prevent air entrapment.


Pre-soaking the Substrate

For cement-based grouts, pre-soaking the substrate is crucial. This process involves saturating the anchor pockets with water for a minimum of 2 hours (preferably 24 hours) and vacuuming out the excess water before grouting. Additionally, the anchor holes should be undercut or rough-sided for enhanced mechanical resistance.


Proper mixing of the grout components is essential for a successful application. This involves using suitable equipment and ensuring that the mix ratio is maintained. Temperature considerations are also important, with an ideal range between 10°C and 30°C.


When grouting baseplates, it’s essential to flow the grout in a single pass from one side to the other, ideally across the smaller dimension. Formwork should be used to direct the flow and maintain pressure. Care should be taken during the removal of formwork to avoid damaging the freshly grouted surface.

Curing and Protection

After application, both the baseplate and grout should be protected from extreme weather conditions, as large-volume epoxy grout pours can generate significant heat. Proper insulation should be considered to prevent sudden temperature fluctuations.

Epoxy grouts, such as Conbextra Epoxy Grouts by Fosroc®, offer a reliable and robust solution for securing heavy machinery and equipment. Through careful preparation, precise installation, and diligent application, these grouts ensure a strong and durable foundation, contributing to the longevity and stability of industrial installations. Always refer to the manufacturer’s guidelines and consult with relevant parties for specific applications.