MOT TYPE 4 SUB-BASE – FREE DRAINING AGGREGATE

MOT Type 4 Sub-Base is an open-graded, free-draining aggregate specifically designed for projects where effective water management is essential. Unlike traditional MOT Type 1, Type 4 contains little to no fines, allowing water to pass freely through the material while still providing a strong and stable foundation.

Manufactured from crushed stone or recycled aggregates, Type 4 is commonly used beneath permeable paving systems and other applications where drainage performance is a priority. Its open structure helps reduce standing water and supports Sustainable Drainage Systems (SuDS), making it an increasingly popular choice for both domestic and commercial projects.

Ideal For

✔ Permeable Driveways
✔ Permeable Block Paving Systems
✔ Car Parks
✔ Drainage Layers
✔ SuDS Compliant Projects
✔ Areas With Poor Ground Drainage
✔ Commercial & Domestic Groundworks

Typical Coverage

One tonne of MOT Type 4 Sub-Base will typically cover approximately:

• 10–12m² at 50mm depth
• 6–7m² at 75mm depth
• 5–6m² at 100mm depth
• 3–4m² at 150mm depth

Coverage is approximate and will vary depending on compaction, ground conditions, and the exact grading of the material.

For driveways and permeable paving systems, a compacted depth of 100–150mm is typically recommended, depending on the expected loading and ground conditions.