Thermalite Trenchblock Tongue and Groove

‘Strength 4.0 N/mm²
Thermal conductivity 0.15 W/mK
0.23 W/mK (below ground)
Density 600 kg/m³

Thermalite Trenchblock is a tried and tested, economical alternative to the construction of cavity walls with concrete infill for foundations.
• For use in soils of up to Design Sulfate Class DS 4
• Available with tongue and groove joints and handholds
• Improves thermal performance

Thicknesses: 255 - 355mm

Tongue and Groove

The tongue and groove joints enable blocks to slot easily together in one simple process. By joining the blocks together in this way, the perp-ends do not need to be mortared, providing a much quicker method of construction.’