Thermalite 3.6N T&G Trench Block – 440 x 215 x 355mm

About this item:
The Thermalite 3.6N Tongue & Groove (T&G) Trench Block is a robust, high-performance foundation block designed to replace traditional cavity wall construction below ground level. Ideal for housing developments, extensions, and commercial builds, this lightweight yet structurally sound block eliminates the need for multiple layers of blocks and bricks at foundation level, significantly speeding up the build process while reducing labour and material costs.

The integrated tongue and groove profile ensures a snug interlocking fit, enhancing wall stability and reducing cold bridging. With excellent load-bearing capacity and outstanding thermal insulation properties, the Thermalite 3.6N T&G Trench Block is an all-in-one solution for thermally efficient, cost-effective foundation construction. Available from DISCOUNT BUILDING SUPPLIES Ltd., it’s a reliable choice for builders seeking both performance and productivity.

Key Features:
• 3.6N/mm² compressive strength suitable for load-bearing foundations
• Lightweight aerated concrete for easier handling and quicker installation
• Tongue and groove joint for improved stability and alignment
• High thermal insulation, reducing the risk of cold bridging
• Replaces traditional cavity wall construction below DPC
• Complies with Part L of the Building Regulations
• Fire- and frost-resistant for added durability
• BBA certified and manufactured to BS EN 771-4 standards

Common Questions:
Q: What are T&G trench blocks used for?
A: T&G trench blocks are used to build the foundation walls up to damp-proof course (DPC) level in place of cavity construction. They simplify and speed up the groundwork phase.
Q: Why choose tongue and groove blocks over plain trench blocks?
A: The T&G design provides better alignment, added stability, and reduces air leakage, making your foundations more thermally efficient and structurally sound.
Q: Can these blocks be used in all soil types?
A: Yes, when paired with appropriate footings, they are suitable for most soil conditions. Always consult a structural engineer for site-specific requirements.
Q: Do these blocks meet building regulations?
A: Yes, they meet or exceed UK Building Regulations and are BBA certified for use in load-bearing foundation walls.
Q: Are these blocks suitable for manual handling?
A: Although large in size, they are significantly lighter than dense concrete blocks, making them more manageable for on-site handling and installation.