Klasse C-board® Cement External Sheathing Board

C-board is a high performance Fibre Cement Board for applications that are looking for a robust A1 Non-Combustible product. This is the ultimate board with a high flexural strength, impact strength, durability, and high racking resistance. Rated as a Category A board to BS EN 12467 where the board may be subjected to heat, high moisture and severe frost. It also has good acoustic and thermal properties to meet various end applications.

High Density - High impact resistance

An excellent choice for modular and offsite builds, this high density, high impact resistant board can also be used in all types of façade solutions as well as many floor and roof constructions.

High Racking Strength

C-board has a high level of dimensional stability making it a good choice in multiple applications, but particularly when racking strength is required.


Acoustically tested according to ISO 10140-3. C-board provides an excellent acoustic solution when combined with SFS and stone mineral wool infill.

Robust & Durable

C-board is extremely durable when compared to all other types of boards. It can withstand all weather conditions and is highly suitable for use in places where the climate is extreme.

Boasts impressive pull out strength and high impact resistance.

Render Ready

C-board is considered suitable for use with external wall insulation systems, cement based render and for flexible thin coat renders. 

Product Specification

Length - 2400mm

Width - 1200mm

Thicknesses - 6/9/12/16/18mm

Average Weights - 7.37/11.28/15.20/19.97/22.57 kg/m2

Tolerances - Length/Width - ±5mm. Thickness ±2mm


Reaction to Fire - BS EN 13501-1 - Non-combustible Euroclass A1

Fire Resistance - BS EN 1365-1 - REI 90

Board Type - BS EN 12467 - Category A

Third Party Accreditation: You can have complete peace of mind that our board has been independently determined by the BBA that it complies with the safety, quality and performance standards set.



An approved render carrier board for leading render system manufacturers:

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More about C-board

  • Download Centre  

    Download Centre

    Datasheets, brochures and more! All available from our download centre.

    Download Centre
  • NBS Source Partner  

    NBS Source Partner

    Klasse Group are partners with NBS, who write specification content and manufacturer information.

  • Projects  


    Klasse is always involved in new and exciting sheathing board projects.


It's easy to do business with us

Klasse understands your requirement for excellent service and product reliability. As a trusted supplier we provide fast quotes and rapid delivery from our UK warehouse.

We have friendly and knowledgeable experts who will help you with your external sheathing needs, every step of the way.