Buy 804 stone online | Available nationwide including Dublin, Cork, Galway, Waterford, Sligo and Limerick

Clause 804 Stone – Premium Sub-Base Material for Irish Construction                                                                                       

What is Clause 804?

UGM (Unbound Granular Material) previously known as Cl 804 stone, is a high-quality crushed  aggregate that meets the TII Specification for Roadworks and IS EN (Irish Standard 13242 &SR21) for unbound granular fill. It is widely used across Ireland as a sub-base material for:

  • Driveways
  • Patios
  • Road construction
  • Paving foundations
  • Hard landscaping projects
Granular Fill Materials
Granular fill materials

Available in a range of sizes and gradings

Why Choose Roadstone UGM?

At Roadstone, we supply NSAI-certified UGM A &UGM Ac that is engineered for durability, drainage, and compaction. Our UGM stone is sourced from sustainably managed Irish quarries, ensuring consistent quality and compliance with TII Specification for Road Works Series 800.

Key Features:

  • Grading: 0–31.5mm
  • Compaction: Excellent load-bearing capacity when compacted
  • Drainage: Allows water to percolate, reducing surface pooling
  • Versatility: Suitable for domestic, commercial, and civil engineering projects

Applications of UGM Hardcore

UGM is the go-to choice for creating a stable and long-lasting base. Whether you're laying a new driveway or preparing a foundation for paving slabs, UGM ensures structural integrity.

Common Uses:

  • Driveways & Paths: Forms a solid base that resists sinking
  • Patios & Paving: Prevents shifting and cracking of surface layers
  • Road Sub-Base: Complies with NRA/TII standards for public works
  • Landscaping: Ideal for synthetic grass, gravel beds, and more

Why Roadstone is Ireland’s Trusted Supplier

Unlike many online retailers, Roadstone offers:

  • Bulk delivery nationwide
  • On-site technical support
  • Guaranteed compliance with Irish construction standards
  • Competitive pricing with trade discounts
  • Quarry Operations and Material Standards
    Preview image for the video "Quarry Operations and Material Standards".
UGM Stone FAQs

Q: What is the difference between UGM and regular stone?

A: UGM is a graded crushed stone ensures excellent aggregate interlock allowing it to compact tightly. Regular crushed rock lacks this fine material and is less stable under load.

Q: How much UGM do I need?

A: One tonne of UGM covers approximately 10–12m² at 50mm depth. 

Q: Can I use UGM for drainage?

A: Yes, while it compacts well, UGM still allows for moderate drainage, making it ideal as a sub-base for driveways and patios.

Order Clause UGM Online or In-Store

Get your project started with Roadstone’s premium UGM stone. Available in:

  • 1 Tonne Bulk Bags
  • Loose Loads
  • Collection or Delivery

Order Now or contact us for a free quote.