In response to improved standards of energy efficiency, new Durox Foundation aircrete blocks have been added to the range to support wider cavity walls, which are increasingly being used above ground. They measure 350mm x 310mm x 215mm. They can be used to support cavity, solid or frame construction.
Durox Foundation 350 x 310 working dimensions
Dimensions are 350mm x 310mm x 215mm high.
Foundation blocks can be laid to a wall width of 350mm x 310mm depending on the requirements of the project.
Unit and Laid Weights
| 310mm wall | 350mm wall | |
| Foundation 3.6N/mm² | ||
| Unit weights (kg) | 11.1 | 11.1 |
| Laid weights (kg/m²) | 177 | 200 |
| Foundation 7.3N/mm² | ||
| Unit weights (kg) | 16.4 | 16.4 |
| Laid weights (kg/m²) | 242 | 273 |
Unit and laid weights are given for design purposes and are approximate and calculated based on the specified dry density with a 3% moisture content of 3% added to provide equilibrium weights. Delivered block weights will be approximately 22% higher.
Durox Foundation 350 x 310 installation
Durox Foundation blocks should be installed in accordance with BS 5628-3. The manufacturing process may result in some partial bonding of blocks in the pack. Where this occurs blocks can be separated using, for example, a rubber mallet.
For below ground constructions (excluding work in retaining or basement walls) Foundation blocks can be used with unfilled vertical joints, provided the blocks are built with their ends closely butted together to hinder the passage of vermin. This guidance is consistent with the advice given in BRE Information Paper IP7/05.
Durox Foundation 350 x 310 quantities
Product is sold in packs of 80 blocks. The following number of blocks is required per m² of wall.
| 310mm wall | 350mm wall | |
| Number of blocks required | 12.3 | 13.9 |
The number of blocks has been calculated assuming 10mm width bed and mortar joints
Durox Foundation 350 x 310 packaging and delivery
Product is supplied in shrink-wrapped site packs containing 80 blocks in the pack. Each pack measures 1400 (L) x 1075 (W) x 620 (H). Packs should be off loaded and stored on firm level ground.
Durox Foundation 350 x 310 benefits
- Save time and money - no wall ties or concrete cavity fill, speedy construction, no risk of collapsed cavities
- Support of wider cavity walls above ground - up to 350mm width - in response to improved standards of energy efficiency
- Strengths of 3.6N/mm² and 7.3N/mm² can satisfy low and high rise building requirements
- Meets manual handling guidelines for the repetitive lifting of masonry units
- Coursing height of 215mm aids work in stepped foundations
Durox Foundation 350 x 310 specification
Foundation 3.6N/mm²
- Mean compressive strength: 3.6N/mm²
- Thermal conductivity: 0.11W/mK
- Gross dry density: 460kg/m³
Foundation 7.3N/mm²
- Mean compressive strength: 7.3N/mm²
- Thermal conductivity: 0.19W/mK
- Gross dry density: 680kg/m³
Durox Foundation is manufactured to comply with EN 771-4 and conforms to Category 1 manufacturing control as specified in BS 5628-1.
Durox Foundation 350 x 310 environmental performance
Durox Foundation blocks are manufactured under an ISO 14001 compliant Environmental Management System that is independently certified by BSI. Summary green guide ratings applicable to aircrete blocks can be found in the BRE Green Guide to Specification www.thegreenguide.org.uk.
