300MM THERMALITE T&G TRENCH BLOCK 3.6N (20 blocks)

The Thermalite Aircrete Trenchblock Tongue & Groove – 300mm is a purpose-designed foundation block engineered to simplify below-ground construction while delivering strong thermal performance and reliable strength. Manufactured from lightweight Thermalite aircrete, this trench block offers excellent insulation properties alongside easy handling on site.

Integrated tongue & groove ends allow blocks to interlock securely without mortaring perp joints, while built-in handholds help speed up installation and reduce manual strain.

Key Features

• Designed for foundation and below-ground construction

• 300mm wide trench block suitable for narrower foundation walls

• Tongue & groove ends remove the need for mortared perp joints

• Lightweight aircrete construction for easier handling

• Integrated handholds improve on-site productivity

• Good thermal performance compared to traditional dense trench blocks

Typical Applications

• Trench wall foundations

• Sub-DPC blockwork

• Retaining and foundation walls

• Projects requiring improved thermal efficiency below ground

Technical Specification

• Block Type: Aircrete Trench Block

• Material: Aircrete (cellular concrete)

• Face Size (L × H): 440 × 215 mm

• Thickness: 300 mm

• Compressive Strength: 3.6 N/mm²

• Thermal Conductivity: Approx. 0.24 W/m·K (below ground)

• Configuration: Tongue & Groove with handholds

• Pack Size: 20 blocks

• Standards: Manufactured to BS EN 771-4

Why Buy From Us

We supply site-ready foundation blocks selected for ease of installation and dependable performance. The Thermalite 300mm tongue & groove trench block helps reduce build time, improve thermal efficiency, and deliver consistent results below ground.