Tips - Optimum Standards and Specifications

Optimum Standards and Specifications

Based upon various cities, counties and MDOT specs,and on average loads and soils

Sub-base	6 inches	21-AA limestone
Base	2.5"	20-A asphalt
-	2.5"	20-AA asphalt
-	2.5"	20-A recycled asphalt
Top	1.5"	36-A asphalt

For maximum life (approximately 15-20 years) and reduced repairs. "Reduced thickness usually means reduced life."