The 300mm T&G Thermalite Trenchblock Hi-Strength (7N) is a robust and efficient alternative to traditional foundation construction, allowing builders to lay the inner leaf of cavity walls quickly and with fewer components. Designed with interlocking tongue and groove edges, these blocks ensure alignment, reduce mortar use, and improve stability.

With a high compressive strength of 7.0N/mm², these Thermalite trench blocks 300mm are suitable for loadbearing applications and can be used below ground level, making them ideal for foundation walls, basements, and retaining structures. Their aerated composition provides excellent thermal insulation and helps reduce cold bridging, supporting compliance with building regulations.

Lightweight for their size, these blocks are easy to handle and install, making them a popular choice for time-sensitive builds. Available now at Mitcham Builders Merchants, Thermalite trench blocks 300mm offer strength, speed, and energy efficiency for modern foundation construction.