Classification of Concrete Floors Based on Intended Use

Class	Anticipated Traffic Type	Use	Special Considerations	Final Finish
1. Single Course	Exposed Surface - foot traffic	Offices, churches, commercial, institutional, multi-family	Uniform finish, non-slip aggregate in specific areas, curing	Normal steel troweled finish, non-slip finish where required
1. Single Course--Decorative	Exposed Surface - foot traffic	Decorative concrete	Colored mineral aggregate, color pigment or exposed aggregate, stamped or inlaid patterns, artistic joint layout, curing	As required
2. Single Course	Covered surface - foot traffic	Offices, churches, commercial, institutional, multi-family with floor covering	Flat and level slabs suitable for applied coverings	Light steel troweled finish
3. Two course	Exposed or covered surface--foot traffic	Unbonded or bonded topping over base slab for commercial or non-industrial buildings where construction type or schedule dictates	Base Slab - gooduniform level surface, curing Unbonded topping– bondbreaker on base slab, min thickness 3 in., reinforced, curing Bonded Topping - properly sized aggregate, ¾ in. min thickness, curing	Base slab - troweled finish under unbonded topping; clean textured surface under bonded topping Topping - for exposed surfaces, normal steel-troweled finish. For covered surface light steel-troweled finish.
4. Single Course	Exposed or covered surface—foot and light vehicular traffic	Institutional or commercial	Level and flat slab suitable for applied coverings, nonslip aggregate for specific areas, curing. Coordinate joints with applied coverings	Normal steel-troweled finish
5. Single Course	Exposed surface—industrial vehicular traffic—pneumatic wheels and moderately soft solid wheels	Industrial floors for manufacturing, processing, and warehousing	Good uniform subgrade, joint layout, abrasion resistance, curing	Hard steel-troweled finish
6. Single Course	Exposed surface—heavy-duty industrial vehicular traffic—hard wheels and heavy wheel loads	Industrial floors subject to heavy traffic; may be subject to impact loads	Good uniform subgrade, joint layout, load transfer, abrasion resistance, curing	Special metallic or mineral aggregate surface hardener; repeated hard steel-troweling
7. Two course	Exposed surface—heavy-duty industrial vehicular traffic—hard wheels and heavy wheel loads	Bonded two-course floors subject to heavy traffic and impact.	Base slab - good uniform subgrade, reinforcement, joint layout, level surface, curing Topping - composed of well-graded all mineral or all-metallic aggregate. Minimum thickness 3/4 in.; mineral or metallic aggregate surface hardener applied to high-strength plain topping to toughen, curing	Clean, textured base slab surface suitable for subsequent bonded topping. Special power floats for topping are optional, hard steel-troweled finish
8. Two course	As in Classes 4, 5, or 6	Unbonded topping—on new or old floors where construction sequence or schedule dictates.	Bondbreaker on base slab, minimum thickness 4 in., abrasion resistance, curing	As in Classes 4, 5 or 6