6F2 vs MOT Type 1: Which Aggregate Does Your Project Need?

When starting any groundworks project – whether building a commercial haul road, prepping a driveway or laying foundations for a garden building – selecting the right sub-base or capping material is critical.

Two of the most popular heavy-duty materials in UK construction are 6F2 and MOT Type 1. Whilst they might look somewhat similar in a bulk pile, they serve distinct structural roles on-site. Using the wrong one can lead to uneven settling, poor compaction or unnecessary expenditure.

Here is a clear guide comparing 6F2 vs MOT Type 1, their key differences, and how to choose the right aggregate for your project.

What is 6F2? 6F2 is a coarse recycled aggregate containing a blend of crushed brick, concrete, mortar and stone. As it is produced from recycled materials, its precise composition and grading can vary depending on the source and batch. Grading :A variable mixture of coarse material and fines. Exact particle sizes depend on the source and batch, and occasional oversized or elongated pieces may be present. Primary Role: Capping layer and bulk fill. Key Characteristics: Large, chunky stone fragments combined with fine material. Highly economical for raising ground levels or firming up soft, boggy earth. Creates an exceptionally tough, temporary surface for heavy plant vehicles.

What is MOT Type 1 Aggregate?

MOT Type 1 is a high-specification sub-base material. It is available as both a Primary (e.g. quarried limestone or gritstone) and Recycled (e.g. crushed concrete and brick) aggregate.

• Size: Graded approximately from 40mm down to dust.
• Primary Role: Final load-bearing sub-base layer.
• Key Characteristics:
  • Blended to achieve maximum density and compaction.
  • Locks tightly together under roller or whacker plate compaction to form a rigid, flat platform.
  • Designed to support heavy vehicle loads without shifting.

 

6F2 vs MOT Type 1: A Quick Comparison

Feature	6F2 Crusher Run / Capping	MOT Type 1 Sub-Base
Grading Size	Variable coarse grading with fines; exact sizes vary by source and batch	Controlled grading, commonly approximately 40mm down to dust
Material Origin	Recycled crushed concrete & brick	Quarried stone or Recycled brick and concrete
Main Function	Ground stabilization & deep fill	Final sub-base under paving, tarmac or concrete
Compaction Finish	Rough, sturdy base layer	Dense, tight, flat surface finish
Cost Comparison	Lower cost (ideal for large volumes)	Higher cost

 

When Should You Use 6F2?

Choose 6F2 when you need bulk strength over large volumes or when working on soft, unstable ground.

When Should You Use MOT Type 1?

Choose MOT Type 1 when preparing the direct foundation layer immediately beneath your final surface.

Best Approach: Combining 6F2 and MOT Type 1

On larger groundworks projects, professional contractors rarely choose one over the other – they use both together in layers.

1. Bottom Layer (Capping): Lay a layer of 6F2 to firm up soft sub-soil, fill depth and create a solid working surface.
2. Top Layer (Sub-Base): Top with an least 100mm layer of MOT Type 1. Compact thoroughly to ensure that the top layer has no rough gaps, creating a smooth, flat, load-bearing surface.

This two-layer approach delivers maximum structural integrity whilst significantly reducing overall material costs.

Bulk Aggregate Delivery

At VWJ Earthmoving, we supply and deliver high-grade recycled 6F2, MOT Type 1 (Primary & Recycled) and crushed aggregates straight to your site. Our modern fleet of 8-wheel tippers and grab lorries ensures prompt delivery throughout Cheshire, Staffordshire, Deeside and the surrounding areas.

 

Contact our team today on 01270 251 522 for expert advice or to request a competitive delivery quote!