Thermalite Aircrete Tongue & Groove Trenchblock – 440 x 215 x 355 mm

Lightweight Strength Meets Efficient Installation

Elevate your construction with the 3.6N Thermalite Aircrete Tongue & Groove Trenchblock — a smart choice for builders seeking a combination of strength, thermal performance, and ease of use. Engineered with a tongue and groove system, these blocks ensure quick, secure installation while providing excellent compressive strength and fire resistance.

Designed for concealed applications, these trenchblocks are ideal for replacing traditional cavity walls that use heavy concrete brick or block infill. Thanks to their closed micro-cellular structure filled with trapped air pockets, they offer outstanding thermal and sound insulation, helping you meet stringent U-value targets more easily. Plus, they’re lightweight, reducing handling effort and speeding up the build process.

Features & Benefits

• Closed micro-cellular structure with air pockets for superior insulation
• Excellent thermal and sound insulation properties
• Lightweight and easy to handle
• High compressive strength with fire resistance
• Tongue and groove design enables swift, secure installation
• Ideal for concealed applications and cavity wall replacement
• Manufactured to British Standards for quality assurance
• Supports lower CO2 emissions for environmentally friendly builds

Specification

• Brand: Forterra

• Range: Thermalite

• Dimensions: 440mm (H) x 215mm (L) x 355mm (W)

• Weight: 20.80 kg

• Manufacturer Code: SGAA355A

Perfect For

• Concealed structural applications

• Replacing cavity walls with heavy concrete infill

• Projects requiring high thermal and fire resistance performance

• Builders focused on quality, efficiency, and sustainability

Why Choose Thermalite Aircrete Tongue & Groove Trenchblocks?

These blocks combine innovative design and trusted British Standards compliance, delivering a lightweight yet strong solution that accelerates installation and enhances energy efficiency—making them the smart choice for modern construction projects.