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Type 1 Primary
Description
A limestone/granite/ragstone sub-base produced from quarried crushed rock containing a well graded mixture of particles ranging from 0mm to 32mm
Typical Uses
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Used to create an easily compacted load bearing non-permeable sub-base and back fill i.e. roads, paths, driveways, car parks and structural bases
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Typical use is as a finished surface prior to a top coating of asphalt, concrete, shingle and block paving
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Useful Information
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Interlocks when compacted to ensure minimal voids and provide excellent load bearing qualities
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Should be non-frost susceptible when used within 450mm of the finished surface, and has a maximum permitted top size of 63mm, graded down to dust
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Not to be confused with other materials such as Road Planings, Scalpings and Type 2 which do not comply with the clause 803 grading specification (all have higher fines content)
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If not conditioned with water the material will not compact properly