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A1 non-combustible, BBA certified fibre cement building board

RCM Y-wall is a high-quality flexible calcium silicate based fibre cement building board with additives, offering excellent fire properties as well as high levels of dimensional stability.

Y-wall is used primarily as a fire rated external sheathing or building board. Used extensively on both steel frame and timber frame structures, Y-wall is used behind all types of facade solutions, as well in ceilings offering a non-combustible classification.

Y-wall is ideal for modular construction methods.


  • Fire rated to EN 13501-1 class A1
  • BBA approved
  • Flexible and strong
  • Excellent water resistance
  • Easy to use
  • High levels of dimensional stability
  • Integrates with other RCM products

Standard Board Size

2400 x 1200mm (6mm, 9mm, 12mm and 15mm)

Other board sizes are available.


RCM Y-wall can be cut, drilled and nailed using conventional hand tools; offering many of the properties of timber.

For cutting the product in any volume, we recommend the use of an RCM poly crystalline diamond Dart Blade to avoid excessive wear on other blades. Alternatively, RCM offer a complete fabrication service, please contact our technical department for details.

Key applications

  • Sheathing board
  • Ceilings
  • Partition walling
  • OEM applications for improved strength and density
  • Recommended for buildings above 18m

Suitable for the following construction types

  • Steel Frame
  • Timber Frame
  • Modular / Offsite

Technical Data

  • Contact us for more information - 0800 612 4662


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