What is MOT Type 1?

MOT Type 1 refers to a standardised crushed stone aggregate, typically limestone or granite, used as a foundational sub-base material in paving and road construction. The term comes from the Ministry of Transport specification that governs its composition and performance characteristics.

The material is defined by its grading requirements, which specify the size distribution of stone particles. MOT Type 1 must contain a controlled range of particle sizes, from dust fines to larger stones, creating a well-graded mixture that locks together when compacted. This grading is essential for achieving the required bearing capacity and stability beneath paving surfaces.

Compaction is a critical property of MOT Type 1. The material must compress uniformly to a specified density when rolled or compacted, forming a solid, stable base that resists settlement and movement. Paving contractors use MOT Type 1 as the foundation layer for driveways, car parks, and roads because it provides excellent load distribution and drainage properties.

The material's ability to compact effectively and its cost-effectiveness make it a standard choice for sub-base work across residential and commercial projects. When properly installed and compacted to the correct thickness, MOT Type 1 creates a durable foundation that helps prevent cracking and rutting in the wearing course above. Driveway paving contractors in Cheltenham commonly specify MOT Type 1 for new installations and repairs where a reliable sub-base is required.