3/4" Class II Road Base Regional Quarry Production In All Service Locations - ASTM data available upon request. For general engineering or large purchases go to our commercial section. This is used in landscaping and hardscaping when installing very solid foundations for flagstone, paving stones, pavers, interlocking pavers and decomposed granite pathways. Easy to get heavy compaction with, the Class II Road base is excellent for base applications in landscape construction projects. Made from a mixture of different sizes of crushed hard rock from 3/4" all the way down concrete sand.