Sustainability Report

Carbon & Environmental Performance

Primary embodied carbon source: Cement stabiliser

Elimination of mortar:

• Avoids additional cement consumption typically used in conventional masonry

Indicative embodied carbon values:

• Cement contribution: ≈ 95–100 kg CO₂ / m³
• Pressing, curing & limited transport: ≈ 10–35 kg CO₂ / m³
• Total estimated CO₂: ≈ 105–135 kg CO₂ / m³

Additional carbon savings:

• No kiln firing
• No mortar production, transport, or wastage

Sustainability Outcomes

• Material circularity: Earth excavated from site becomes the building fabric
• Zero mortar masonry: Reduced cement, water, and labour
• Low embodied energy: Sun-dried, unfired construction
• High thermal mass walls: Enhanced passive comfort
• Near-zero waste: Precise interlocking eliminates cut-waste
• Low-VOC environment: Natural materials with breathable finishes

Summary Statement

“Castle Earth employs on-site manufactured interlocking CSEB blocks that are dry-stacked without mortar, allowing the architecture to rise directly from its own soil. This system eliminates kiln firing and conventional masonry mortar, achieving structural efficiency, reduced embodied carbon, and a deeply contextual form of sustainable construction.”