Concrete slabs-onground shall be provided with control and contraction joints in accordance with ACI 360 or other approved industry standards. Control and contraction joints shall be designed by an architect or engineer.
Exception: One- and two-family dwellings and townhouses shall comply with the Florida Building Code, Residential Section R506.2.4.
In addition to control and contraction joints, concrete slabs-on-ground shall be provided with crack containment complying with one of the following:
- Concrete slabs-on-ground shall contain micro- or macro-synthetic fiber reinforcement. Fiber length shall be 1/2 inch to 2.25 inches (13 to 56 mm) in length. Dosage amounts shall be from 0.75 to 3.0 pounds per cubic yard (0.45 to 1.78 kg/m3) in accordance with the manufacturer’s recommendations. Synthetic fibers shall comply with ASTM C1116. The manufacturer or supplier shall provide certification of compliance with ASTM C1116 when requested by the building official; or,
Concrete slabs-on-ground containing 6 × 6 W1.4 × W1.4 welded wire reinforcement fabric located in the middle to the upper one-third of the slab. Welded wire reinforcement fabric shall be supported with approved materials or supports at spacing of 3 feet (914 mm) or less. Welded plain wire reinforcement fabric for concrete shall conform to ASTM A1064/A1064M CarbonSteel Wire and Welded Wire Reinforcement, Plain and Deformed, for Concrete.
Exception: Where random cracking is acceptable to the building owner, contraction joints are not required where crack containment complying with one of the above methods is provided.