Thermalite 300mm 3.6N Trench Blocks – Tongue and Groove | SB Building Supplies

The Thermalite 300mm 3.6N Trench Blocks are a highly effective solution for foundation construction, replacing the need for cavity walls with concrete infill, engineering bricks, or heavy aggregate blocks. Featuring tongue and groove joints with built-in handholds, these trench blocks are easier to handle and install, making them ideal for achieving superior thermal performance. Available in both standard and Hi-Strength (7.3N/mm²) variants, they are moisture-resistant and suitable for use in thin joint masonry, reducing both time and costs. The design eliminates the need for mortar on perp ends, simplifying installation. Key Benefits: Improves thermal performance for energy-efficient building Available with tongue and groove joints and handholds for easy handling Ideal for thin joint masonry, saving installation time and money Removes the need for mortar on perp ends Moisture resistant for long-lasting durability Specification: Compressive Strength: 3.6 N/mm² Thermal Conductivity (λ): Above DPC: 0.15 W/m.K | Below Ground: 0.24 W/m.K Dry Density: 600 kg/m³ Face Dimensions: 440 x 215 mm