MOT Type 1 – What Is It?
Certified crushed limestone sub-base material for construction projects
MOT Type 1 Sub-Base Material
What It's Used For
MOT Type 1 is the go-to sub-base material for structural foundations requiring proper load distribution and minimal settlement.
- Road construction sub-base
- Car parks and driveways
- Paving and patio bases
- Structural floor slabs
- Temporary haul roads
Material Composition
Crushed limestone or granite, carefully graded from 40mm down to dust. The fines are essential for proper compaction.
- 40mm maximum size aggregate
- Includes binding fines
- Compacts to 95% density
- Low water absorption rate
- Frost resistant material
Where It Comes From
Sourced from certified quarries meeting Highways Agency standards.
- UK limestone quarries
- Granite quarries (Scotland/Wales)
- Recycled concrete (where permitted)
- All sources fully certified
Load Sizes Available
Flexible delivery options to suit your project size and site access.
- 20-tonne loads (standard)
- 10-tonne loads (restricted access)
- Grab lorry delivery available
- Multi-drop deliveries possible
Technical Specifications
| Property | Specification |
|---|---|
| Certification | Highways Agency Clause 803 (SHW 803) |
| Maximum Size | 40mm nominal |
| Grading | Type 1 grading envelope |
| Fines Content | 0-10% passing 0.075mm sieve |
| Compaction Density | 95% modified Proctor density |
| CBR Value | >30% at 95% compaction |
| Documentation | Full certification and testing certificates provided |
Frequently Asked Questions
What's the difference between MOT Type 1 and Type 2?
Type 1 contains fines (dust) that bind the material when compacted, creating an almost impermeable layer. Type 2 has no fines, making it more free-draining but less stable. Use Type 1 for structural bases, Type 2 for drainage layers.
How much MOT Type 1 do I need?
For a 100mm compacted depth, you'll need approximately 2.2 tonnes per 10m². Standard driveways need 100-150mm depth, while commercial applications typically require 150-225mm.
Can I use recycled MOT Type 1?
Yes, recycled crushed concrete meeting Clause 803 specifications performs identically to virgin limestone. However, it's not suitable where sulfate-resistant concrete is specified.
How should MOT Type 1 be compacted?
Lay in maximum 150mm layers and compact using a vibrating roller or plate compactor. Material should be slightly moist (not wet) for optimal compaction. Expect 20-30% reduction in depth after compaction.
Does MOT Type 1 drain water?
When properly compacted, Type 1 becomes nearly impermeable, which is why it's ideal under slabs and paving. For drainage applications, use Type 2 or clean stone instead.
What documentation comes with delivery?
Every load includes weighbridge tickets, material certification to Clause 803, test certificates, and source quarry information – everything needed for compliance and inspections.
Need MOT Type 1 Delivered?
Certified material, full documentation, reliable delivery across London.
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