Thermalite Trenchblock Tongue and Groove is an alternative to the construction of cavity walls with concrete infill, engineering bricks or heavy aggregate blocks for foundations. It is available as Hi-Strength Trenchblock (with compressive strength of 7.3N/mm2) and with tongue and groove joints and handholds for easy handling.



Improves thermal performance

Available in standard or with tongue and groove joints and handholds

Can be used in thin joint masonry, saving time and money

Removes the need to mortar perp ends

Moisture resistance


Applications: Foundations

Thermalite T&G Trenchblock 3.6N Block 300mm

SKU: 12851304

Specification Key Data:


Compressive Strength: 3.6 N/mm2

Design above dpc: 0.15 W/m.K  Below ground: 0.24 W/m.K

Dry Density: 600 kg/m2

 Working Dimensions  215mm x 440mm x 300mm

Dry Weight 17.5kg