What is MOT Type 1?
MOT Type 1 is a graded crushed aggregate material commonly used as a sub-base layer in paving and construction, typically made from recycled asphalt and stone waste.
MOT stands for "Macadam Open Textured," though the designation now refers to a broader category of graded crushed aggregate materials meeting British Standard specifications. Type 1 is the most widely used grade in paving work, consisting of a well-graded mix of crushed stone, brick, and often recycled asphalt, compacted to form a stable foundation layer.
In driveways, patios, and road construction across Cheltenham, MOT Type 1 serves as the sub-base layer sitting directly beneath surfacing materials like tarmac, block paving, or concrete. The material's angular stone particles lock together when compacted, providing load-bearing capacity and drainage. It typically compacts to a density that can support both light domestic traffic and heavier vehicles.
Contractors select MOT Type 1 for its cost-effectiveness compared to virgin stone aggregates and its role in meeting building regulations for foundation depth and bearing strength. The material must meet strict grading requirements: particles range from dust fines up to 40mm, ensuring proper compaction and stability. Quality varies between suppliers, so specifications often reference BS 3882 or local authority standards.
When commissioning paving work in the area, understanding MOT Type 1 helps you assess whether a contractor is planning appropriate foundation preparation. Poor or inadequate sub-base is a common cause of premature driveway failure, making this material specification a marker of thorough workmanship.