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Alliance Residence October 18,2016 J.N.: 2530.00 Page 14 a greater slab thickness and reinforcement based on proposed use and loading conditions and such recommendations should govern i f greater than the recommendations presented herein. Concrete floor slabs in areas to receive moisture sensitive coverings should be underlain with a minimum of 10-mil moisture vapor retarder con forming to ASTM E 1745, Class A. The membrane should be properly lapped, sealed, and underlain with at least 4 inches of sand having a sand equivalent (SE) no less than 30. One inch of this sand may be placed over the vapor barrier to aid in the curing of the concrete. This vapor retarder system is anticipated to be suitable for most flooring finishes that can accommodate some vapor emissions. However, this system may emit more than 4 pounds of water per 1000 sq. ft. and therefore, may not be suitable for all flooring finishes. Additional steps should be taken if such vapor emission levels are too high for anticipated flooring finishes. Special consideration should be given to slabs in areas to receive ceramic tile or other rigid, crack- sensitive floor coverings. Design and construction should mitigate hairline cracking through the use of additional reinforcing and careful control of concrete slump. Block-outs should be provided around interior columns to permit relative movement and mitigate distress to the floor slabs due to differential settlement that will occur between column footings and adjacent floor subgrade soils as loads are applied. A 12-inch-wide grade beam, founded at the same depth as adjacent footings, should be provided across garage entrances or other large door openings. The grade beam should be reinforced with a minimum of four No. 4 bars, two top and two bottom. Prior to placing concrete, subgrade soils below slab-on-grade areas should be thoroughly moistened to provide moisture contents that are at least 120 percent of optimum to a depth of 12 inches. Design of the proposed slabs in accordance with "Design of Slab-on-Ground Foundations" by Wire Rein forcement Institute (1981 and updated 1996) may be based on an Effective Plasticity Index of 32 (includes factors for sloping ground and overconsolidation). 6.3.8 Post-Tension Slab-on-Grade The thickness of the floor slabs should be determined by the project structural engineer. However, we recommend a minimum slab thickness of4.5 inches. Perimeter edge beams should be founded at a minimum depth of 15 inches below the lowest adjacent final ground surface. Interior beams may be founded at a minimum depth of 12 inches below the tops of the finish floor slabs. Concrete floor slabs in areas to receive moisture sensitive coverings should be underlain with a minimum o f 10-mil moisture vapor retarder conforming to ASTM E 1745, Class A. The membrane should be properly lapped, sealed, and underlain with at least 4 inches of sand having a sand equivalent (SE) no less than 30. One inch of this sand may be placed over the vapor barrier to aid in the curing of the concrete. Where a mat slab is used and is at least 8 inches in thickness, the sand may be reduced to one inch in thickness. This vapor retarder system is anticipated to be suitable for ALBUS-KEEFE & ASSOCIATES, INC.