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ENGEO <br /> INCORPORATED <br /> <br /> <br />5150.100.101 <br />May 2, 2008 Page 21 <br />8. SLABS-ON-GRADE <br /> <br />8.1 EXTERIOR FLATWORK <br /> <br />Exterior flatwork includes items such as concrete sidewalks, steps, and outdoor courtyards <br />exposed to foot traffic only. Provide a minimum concrete flatwork thickness of 4 inches. <br /> <br />Construct control and construction joints in accordance with current Portland Cement <br />Association Guidelines. <br /> <br />8.2 INTERIOR CONCRETE FLOOR SLABS <br /> <br />8.2.1 Minimum Design Section <br /> <br />We recommend the following minimum design: <br /> <br />1. Place No. 3 rebar on 18-inch centers within the middle third of the slab to help control the <br />width of shrinkage crack, which inherently occur as concrete cures. <br /> <br />2. Provide a minimum concrete thickness of 5 inches. <br /> <br />The structural engineer should provide final design thickness and additional reinforcement for <br />any structural loads, including traffic or rack loads. <br /> <br />8.2.2 Slab Moisture Vapor Reduction <br /> <br />When buildings are constructed with concrete slab-on-grade, water vapor from beneath the slab <br />will migrate through the slab and into the building. This water vapor can be reduced but not <br />stopped. Vapor transmission can negatively affect floor coverings and lead to increased moisture