What is MOT Type 1?

MOT Type 1 refers to a graded crushed aggregate material that forms the sub-base layer in paving and ground construction projects. The material comprises a blend of crushed stone, dust, fines, and recycled aggregates that compact together to create a dense, load-bearing foundation.

The composition of MOT Type 1 meets British Standard specifications for particle size gradation, typically ranging from large stones down to dust particles. This varied grain structure allows the material to compact firmly under traffic loading or machinery, reducing settlement and movement over time. The material achieves its strength through mechanical interlocking of particles rather than binding agents, making it suitable for applications where drainage and stability are priorities.

In paving builds, MOT Type 1 sits beneath the wearing course (asphalt or tarmac) and any binder course, distributing loads from above and protecting the subgrade soil from water infiltration and deformation. It is often specified in driveway, carpark, and road construction where a code of practice or design standard calls for a sub-base layer. Contractors across Cheltenham regularly specify MOT Type 1 because it offers predictable compaction, cost efficiency, and regulatory compliance. The depth and compaction requirements vary depending on the expected traffic and ground conditions, typically ranging from 100mm to 200mm when properly rolled.

Find specialist paving contractors in your area who can advise on MOT Type 1 specification for your project.