300mm Thermalite Aircrete 3.6N Trenchblock
3.6N aircrete trench block for below-damp proof course work. 300mm width supports single-leaf foundation walling, reducing labour. Improves thermal and moisture performance.
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Product Overview
3.6N aircrete trench block for below-damp proof course work. 300mm width supports single-leaf foundation walling, reducing labour. Improves thermal and moisture performance.
Delivery & Returns Information
How Our Delivery Works
We work with a nationwide network of trusted suppliers. As a result, items in your basket may be supplied by different suppliers and delivered separately. Where this applies, you'll see multiple delivery charges at checkout. We always aim to group products from the same supplier to keep delivery costs as low as possible.
Delivery Areas & Charges
Delivery charges listed on our website apply to mainland UK, excluding the following postcode areas: AB, CF, DD, DG, FK, KW, IV, LA, LD, LL, NP, PA, PH, SA, SY
If your delivery address falls within one of these postcode areas, we’ll be in touch before processing your order to confirm any additional delivery costs.
Please note: We do not currently offer delivery outside the UK mainland.
Standard (Nationwide) Delivery
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Core Products Core
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|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 ex. VAT | £20 ex. VAT |
| Over £300 ex. VAT | FREE |
Core Delivery charges apply only when all products in an order that have equivalents are accepted as such. If even one product cannot be substituted with an equivalent, the entire order will not qualify for Core Delivery charges.
| Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £100 | £15 ex. VAT |
| Between £100 - £300 ex. VAT | £10 ex. VAT |
| Over £300 ex. VAT | FREE |
| Insulation, Plasterboard and Drylining Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £350 | £35 ex. VAT |
| Over £350 ex. VAT | FREE |
| Screws & Fixings and Adhesives & Sealants | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £50 | £5 ex. VAT |
| Over £50 ex. VAT | FREE |
Express Delivery
| Express Delivery - Insulation and Plasterboard & Drylining | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £400 | £50 ex. VAT |
| Over £400 ex. VAT | £35 ex. VAT |
| Express Delivery - Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 | £50 ex. VAT |
| Over £300 ex. VAT | £35 ex. VAT |
Returns
We offer a 30 day returns policy on any faulty products.
Key Features
- {{check_circle}} Eliminates the need for mortar perpends
- {{thermostat}} Contributes to improved thermal performance
- {{line_style}} Substitute for constructing cavity walls using concrete infill
- {{update}} Accelerates the construction of foundation walls below DPC
Technical Specification
| Thickness: | 300mm |
|---|---|
| Length: | 440mm |
| Height: | 215mm |
| Sales Unit: | Each |
| Brand: | Thermalite |
| Manufacturer's Reference: | STTG3001103GR |
| Weight: | 17.5kg |
| Compressive Strength: | 3.6N |
Technical Downloads
Product Overview
300mm Thermalite aircrete trench block with 3.6N/mm² compressive strength, 440mm x 215mm face size, and 600kg/m³ density.
Designed for below-damp proof course foundation walls, supporting single-leaf construction while improving thermal and moisture performance.
300mm thickness is the typical size for trench block foundations, replacing cavity wall construction.
Features & Benefits
- Compressive strength (3.6N/mm²): Suitable for foundation and load-bearing applications.
- Thermal conductivity λ = 0.15W/m·K: Helps reduce heat loss through groundworks.
- High moisture resistance: Provides durability in damp-prone areas.
- 80% recycled content: Supports sustainable building practice.
- Lightweight compared to concrete trench blocks: Easier handling and quicker build times.
- Standard face dimensions 440mm x 215mm: Consistent sizing for efficient coursing.
- Thickness 300mm: Wide format reduces the need for cavity foundations.
Please Note: Orders large enough to require a pallet will require a £20 ex VAT refundable pallet charge to be paid per pallet. Our customer service team will reach out to you if this applies to your order.
Applications
- Foundation walls: Suitable for single-leaf construction below DPC.
- External walls above foundations: Provides thermal continuity from base to walling.
- Load-bearing foundations: Simplifies construction by replacing cavity wall foundations.
- Separating foundation walls: Provides stability for partitions below ground.
Installation Guidance
- Use thin-joint or traditional mortar: Provides strong bonding, structural stability, and reduced cold bridging.
- Lay below DPC level: Ensures correct application in foundations.
- Maintain level and alignment: Prevents settlement and structural defects.
Compliance & Performance
- Compressive strength (3.6N/mm²): Meets requirements for foundation walling.
- Service class: Suitable for below-ground use in damp-prone applications.
