Bedding
Aggregate (5, 10, 20, 40...):
Drainage rock used around pipes and behind
retaining walls. Allows moisture to pass through.
Select
Fill:
Compactible gravel used for filling areas and providing
temporary access in all weather.
Bottom
Course:
Used for conforming road bases. When compacted it creates
a solid surface on which to build.
Top
Course:
A
conforming roadbase with high compaction rates used
as a final layer before sealing.
Rocks:
Mattress screened rocks with no fines varying in size
as fillers. 150-300, 300-500, etc.
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