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Global HSE Group are Manufacturer-Approved Installers of Render Carrier Board Systems

What are ROCKWOOL Render Carrier Board Systems?

Rockwool render carrier board systems are external wall insulation (EWI) systems that use rigid mineral wool boards made by ROCKWOOL as the base layer for a rendered exterior finish.

They are commonly used to insulate and upgrade the external walls of buildings while providing a surface that can be directly rendered.

When are Render Carrier Board Systems Used?

Render carrier board systems are typically used where:

  • Insulation is already built into the wall structure
  • A slim external façade is required
  • Non-combustible materials are needed for compliance
  • The building is high-rise or higher risk

They provide a compliant external finish without adding unnecessary build-up.

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How Does the System Work?

A typical ROCKWOOL render carrier board system consists of several layers:

  1. Substrate/existing wall
  2. Rockwool render carrier board
  3. Base coat with reinforcing mesh
  4. Primer
  5. Decorative render finish

These boards act as thermal insulation, fire protection and acoustic insulation and can typically be found on residential blocks, commercial buildings and high-rise facades where non-combustible insulation is required.

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Types of Steel Frame Render Carrier Board Systems

RCB Silicone Render

Designed for steel frame buildings where insulation is already incorporated within the wall. A1 non-combustible carrier boards create a ventilated cavity and provide a durable substrate for silicone render finishes. The system is under 40 mm thick and achieves an A2-s1, d0 fire rating.

A1 RCB Brick Slip

A slim brick slip façade solution for steel frame buildings with insulation already provided within the wall structure. A1 non-combustible carrier boards are fixed to cavity rails or battens, creating a durable system under 50 mm thick with an A1 fire rating.

RCB Acrylic Brick Slip

Developed for steel frame construction, this system uses A1 non-combustible carrier boards to support acrylic brick slip finishes. It provides a durable façade solution with a depth of under 40 mm and an A2-s1, d0 fire rating.

Types of Timber Frame Render Carrier Board Systems

RCB Silicone Render

For timber frame construction, this system provides a secure substrate for silicone render finishes. A1 non-combustible carrier boards are fixed over a cavity to enhance durability and weather protection. The system is under 40 mm thick and achieves an A2-s1, d0 fire rating.

A1 RCB Brick Slip

A lightweight brick slip solution for timber frame buildings. A1 non-combustible carrier boards are installed onto cavity rails or battens to create a durable, low-profile façade system. The build-up is under 40 mm thick and achieves an A1 fire rating.

RCB Acrylic Brick Slip

Designed to deliver the appearance of traditional brickwork on timber frame structures, this system uses A1 non-combustible carrier boards fixed over a cavity. The slim façade build-up is under 40 mm thick, providing a durable finish with an A2-s1, d0 fire rating.

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Frequently Asked Questions

Why is insulation choice critical in high-rise buildings?

High-rise buildings (typically over 18m in the UK) face greater risk of fire spread via façades. They have limited fire escape options, therefore, choosing non-combustible insulation materials, such as stone wool, is vital for safety and to meet strict building regulations. Insulation is a holistic decision impacting the safety and long-term sustainability of the building. 

What makes ROCKWOOL suitable for high-rise fire safety applications?

ROCKWOOL insulation is made from stone wool, which is non-combustible. This means it does not ignite, does not contribute to the spread of fire, and can with stand temaratures above 1000°C.

In a façade system, this helps prevent fire from spreading externally and supports the building’s overall fire strategy.

What is the difference between stone wool and other types of insulation?

ROCKWOOL stone wool is made from volcanic rock and achieves an European Reaction to Fire Classification of A1 – non combustible. Stone wool is also a durable choice; its properties and benefits don’t reduce or change over time and the product will effectively perform for 50 or more years.

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If you want to discuss ROCKWOOL render carrier board systems, speak to a member of our team today.