Sub Base Aggregates

Sub Base Aggregates for Construction & Landscaping
Sub base aggregate materials are an essential part of most construction and landscaping projects, providing a stable and durable foundation for roads, driveways, pathways, car parks, building works and drainage applications.

At TW Aggregates, we supply a wide range of high-quality sub base products including Granite Dust, MOT Type 1, Recycled 6F2/6F5 and Road Planings — each selected for strength, reliability and cost-effectiveness. Whether you’re working on a domestic garden project or a large-scale commercial development, we can provide the right aggregate for the job.

All of our sub base aggregates are available in bulk bags for easy handling and storage.

With fast, reliable delivery across the Midlands and beyond, TW Aggregates is your trusted local supplier for all construction and building materials.

FAQ’s

What is MOT Type 1?
MOT Type 1 is a crushed granular sub-base material made from limestone or granite. It is graded from fine dust up to 40mm pieces, which compact together to form a strong, stable and level foundation. The “MOT” refers to the Ministry of Transport, as this type of aggregate meets their specifications for highway construction.

What is MOT Type 1 primarily used for?
MOT Type 1 is mainly used as a sub-base for roads, driveways, car parks, patios, and paths. Its excellent compaction qualities make it ideal for creating a firm foundation before laying tarmac, paving, or concrete.

Is MOT Type 1 suitable for a driveway sub base?
Yes — MOT Type 1 is one of the most popular choices for driveway sub-bases. Once compacted, it provides a durable and stable layer that can withstand vehicle traffic and prevents sinking or shifting over time.

How to install MOT Type 1.

• Excavate the area to the required depth.
• Lay MOT Type 1 evenly across the area.
• Spread and level using a rake.
• Compact thoroughly using a wacker plate or roller until firm and level.
• Check levels and add more material if required before compacting again.

Is MOT Type 1 Free Draining?

No — MOT Type 1 is not free draining. Because it contains fine particles (dust), water does not easily pass through once compacted. For drainage layers, alternatives such as MOT Type 3 or clean stone (e.g. 20mm gravel) are better suited.