Type 1 aggregate is a high-quality, approved granular sub-base material widely used in the UK construction and landscaping industries . It is typically manufactured from recycled crushed concrete, rubble, and other inert materials, making it a sustainable option . The composition of Type 1 aggregate includes a range of particle sizes, from larger pieces up to 40mm down to fine dust. This grading allows the material to compact exceptionally well when laid, forming a very dense, strong, and stable sub-base layer . Due to its excellent compaction properties and load-bearing capacity, Type 1 is the preferred material for creating foundations.

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