A range of high strength concrete building blocks, robust, load bearing units for use in either internal or external walls in a variety of sizes, strengths and finishes offering total flexibility.


  • Available in solid and hollow format for ultimate versatility with a standard strength of 7.3N/mm²
  • High strength blocks up to 22.5 N/mm² are available subject to order to your specification.
  • Masterdenz blocks are available in standard and paintgrade finishes for various applications.
  • Quality assured manufacture
  • For use internally and externally both above and below dpc



  • Internal or external walls
  • Walls above and below ground level/dpc
  • Use in beam and block flooring Standard – Suitable for locations where the surface will not be seen, ie plastered or rendered.
  • Paintgrade Available – Suitable for locations where a consistent close textured face is required, suitable for direct decoration (note only one face and one end guaranteed)
  • RD block – For use in Robust Details Ltd wall type E-WM-9 (Dense block laid flat)



Thickness: 215mm
Mean Unit Strength: 7.3N/mm²
Density (kg/m³): 960
Weight: 25.1kg
Blocks/M²: 9.88
Sound Insulation: 45Rw dB
Thermal Conductivity: Internal 1.29W/mK – External 1.38W/mK
Water Vapour Diffusion Coefficient: 5/15
Moisture Movement: Less than 0.6mm/m
Reaction to Fire: A1 Classification to EN 13501-1
Bond Strength: 0.15N/mm²
Colour: Natural
Finish: Standard (Paint grade available)

215mm Hollow Block