Soils and Stone sub-base are produced by crushing either limestone or granite rock.
Whether a road or a pavement, the sub base is designed to evenly spread the load of traffic bearing areas such as pavements and roads. Made up of a load bearing layer of aggregate the sub base is laid on the sub-grade layer below.
Why is primary aggregate aggregate used as a sub base ?
A sub base layer works by distributing weight over an area. The interlocking capability of certain types of aggregates means that, even with a relatively thin sub base layer, the ability to carry heavy loads can be improved.
Soils and Stones supply high-quality sub-base limestone and granite aggregate including Type 1 SHW Clause 803 (formerly MOT Type 1) and Type 3 Open Graded SHW Clause 805. Read on to see our full product range.
Soils and Stone supply Type 1 quarried primary aggregate to the Highway Agency’s Specification. Type 1 is a granular, well-graded material sized from 63mm to dust, but with most of the material sized at 31.5mm to dust.
Available both as a limestone or a granite, Type 1 SHW Clause 803 (formerly MOT Type 1) is widely used as a sub-base in the construction of roads, car parks and pathways. The mixture of stone and fines compacts to ensure minimal voids and provides a strong and durable sub-base.
All materials are delivered in the loose or via industry standard bulk bags. Our delivery options include grab, tipper, hiab off load or artics (site constraints permitting).
Minimum order of 10 Bulk Bags or 10 m3
020 8546 3860
Type 3 Open Graded SHW Clause 805 is a pure crushed stone, ranging in size from 40mm down to dust, but with a reduced (not zero) fines content.
Available both as a granite or limestone, Type 3 is widely used as a sub-base material for projects where a lower fine content is required for improved drainage. These include sports pitches, equestrian centres, driveway/hard standings and roads.
Soils and Stone supply Type 3 Open Graded SHW Clause 805 quarried primary aggregate to comply with Highways Agency Clause 805 (SHW Clause 805).
Available as either granite or limestone, this is a crushed stone with no fines that ranges in size from 40mm–75mm. When compacted, it provides a hard-wearing and well-drained sub-base for use in roads, paths, drainage ditches, sport pitches, etc.
Available as either a granite or limestone, our 50mmm clean stone is screened to remove the fine content. When compacted it provides a hard-wearing and well-drained sub-base for use in roads, paths, drainage ditches, sport pitches, etc.
Scalpings are typically used as a medium-quality backfill to structures or as a sub-base material for access paths, car parks and driveways. The can be used as an alternative to Type 1 SHW Clause 803 (formerly MOT Type 1) for light-use applications or where a lower load bearing capacity is acceptable.