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Sub Base

At Willis & Ainsworth we pride ourselves in supplying all types of Sub Base and Hardcore materials for any job. We have access to both primary Limestone based materials and Recycled materials. 

Primary vs. Recycled

There is always the question of Primary Sub Base vs. Recycled Hardcore.

Some differences should be mentioned in the product description but the main point for most products is the price. This has the most impact on larger 20 tonne loads or big jobs that need 100s-1000s of tonnes. We would suggest sticking to primary materials or the material specified by the surveyor, unless you or your groundworker / builder really know what to expect with Recycled products. Every producer has different standards when producing recycled materials and only products that are tested comply to a certain standard.

Sustainable Urban Drainage Systems (SUDS)

Materials that comply to "SUDS" are a more recent product within the aggregate industry. These are the materials that conform to Marshalls ® Formpave ® AquaPave ® and AquaSlab ® paving solutions laying guidleines. There is also MOT Type 3 (DOT or MOT type 1 X) this material is what is the suggested base material to all new drives.

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  • Willis & Ainsworth

    0-4mm Limestone Dust

    A 0-4mm Limestone dust. This is an excellent binding dust and is often used to help bind scalpings or MOT Type 1 together if they are slightly stonier than required or have been down for a long time and the dust washed away.  It is sometimes used...

  • Willis & Ainsworth

    10mm Recycled Shingle

      10mm Recycled Shingle is made from crushed concrete, brick and reclaimed gravel. Unlike 10mm Primary Gravel, Recycled Gravel is not a decorative material and we do not suggest laying on driveways and paths as a decorative shingle or stone. It...

  • Willis & Ainsworth

    2-6mm Limestone Chippings

    2-6mm Limestone chippings are used in SUD's (sustainable urban drainage system). This is used as substitute for sharp sand due to its free draining ability. It is also known as priora and aquaflow chippings and is one of the suggested laying...

  • Willis & Ainsworth

    20mm Recycled Shingle

      20mm Recycled Shingle is made from crushed concrete, brick and reclaimed gravel. Unlike 20mm Primary Gravel(s), Recycled Gravel is not a decorative material and we do not suggest laying it on a driveway as a decorative shingle or stone. It is...

  • Willis & Ainsworth

    4-20mm Limestone Chippings

    20mm limestone Chippings used in SuD's. This can be used as a crunch layer underneath the 2-6mm Limestone Chippings when laying a permeable paving or needing to conform to a Sustainable Urban Drainage Solutions (SUDS). Also known as Priora...

  • Willis & Ainsworth

    40mm Recycled Shingle

      40mm Recycled Shingle is made from crushed concrete, brick and reclaimed gravel. The material is usually angular due do it being crushed and screened during the recycling process. Like "rejects" it very good for drainage and is ideal for use in...

  • Willis & Ainsworth

    40mm Scalpings

    Scalpings is a 40mm down to dust limestone or granite material. It can often be confused with MOT Type 1 however it doesnt have to conform to any testing and therfor scalpings tend to be stonier or "dustier" than type 1. It is generally used under...

  • Willis & Ainsworth

    63-10mm Limestone Chippings

      63-10mm Limestone angular chippings are used in SuDS (sustainable urban drainage system). This is used as a base product due to its free draining ability, it is put down before the 2-6mm chippings. It is also known as priora or aquaflow base stone...

  • Willis & Ainsworth

    6F5 Recycled Crushed Concrete

      6F5 is usually around an 80mm-0mm crush and run recycled material consisting on bricks, concrete and occasionally asphalt. 6F5 recycled is used for sub bases, temporary haul roads or building up levels. It can sometimes be referred to as 6F2...

  • Willis & Ainsworth

    80-40mm Crushed No Fines

      80-40mm Crushed no fines is an alternative to 40mm, rejects or oversized drainage materials. It is commonly used for drainage but can be used as free draining sub base. Due to its shape and sizing it drains water very well but it also knits...

  • Willis & Ainsworth

    MOT Type 1

    MOT TYPE 1 sub base is a crushed limestone or granite. It is usually graded as a 0/32mm or 0/40mm. It is often called different names such as D.O.T. Department of Transport or M.O.T. Ministry of Tranport "Type 1". For the material to be called "Type 1"...

  • Willis & Ainsworth

    MOT Type 3

    Type 3 is a crushed Granite or Limestone sub-base similar to Type 1 but with reduced fines to allow water to free drain as a permeable sub base. This material is screened as a blended 0/50mm. This material is used with SUDS (sustainable urban drainage...

  • Willis & Ainsworth

    Priora Chippings

    Priora chippings are a Limestone or Granite material used for permeable paving and SuDs (Sustainable Urban Drainage Systems) this material is available in a range of sizes; 2-6mm, 4-20mm, 10-63mm. They are also sometimes referred to as Aquaflow...

  • Willis & Ainsworth

    Type 1 Recycled Hardcore

      Type 1 Recycled is a mixture of 40mm crushed concrete including; concrete brick and tarmac. Type 1 recycled sub base is one of the few tested recycled materials. It it tested in compliance for the Ministry of Transport specification clause...

  • Willis & Ainsworth

    Type 2

    Type 2 (SHW 804)  is a blended sub-base. It is basically, a mixture of Type 1 and Scalpings and used for path ways and driveways. It conforms to BS EN 13285 Categories for unbound mixture properties. Type 2 is used less and less as it is not...

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