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North Oaks Company LLC <br />Project B2402335 <br />August 22, 2024 <br />Page 17 <br />C.S. Interior Slabs <br />C.S.a. Moisture Vapor Protection <br />Excess transmission of water vapor could cause floor dampness, certain types of floor bonding agents to <br />separate, or mold to form under floor coverings. If project planning includes using floor coverings or <br />coatings, we recommend placing a vapor retarder or vapor barrier immediately beneath the slab. We <br />also recommend consulting with floor covering manufacturers regarding the appropriate type, use and <br />installation of the vapor retarder or barrier to preserve warranty assurances. <br />C.S.b. Radon <br />We recommend installing a radon mitigation system in accordance with local building code. Our certified <br />and licensed radon mitigation professionals can assist in this design, at your request. <br />C.6. Frost Protection <br />A mixture of clay, silty sand, and sand will underlie exterior slabs (i.e., sidewalks, stoops, etc.). We <br />consider the clay and silty sands to be moderately to highly frost susceptible. Soils of this type can retain <br />moisture and heave upon freezing. In general, this characteristic is not an issue unless these soils become <br />saturated, due to surface runoff or infiltration, or are excessively wet in situ. Once frozen, unfavorable <br />amounts of general and isolated heaving of the soils and the surface structures supported on them could <br />develop. This type of heaving could affect design drainage patterns and the performance of exterior slabs <br />and pavements, as well as any isolated exterior footings and piers. <br />Note that general runoff and infiltration from precipitation are not the only sources of water that can <br />saturate subgrade soils and contribute to frost heave. Roof drainage and irrigation of landscaped areas in <br />close proximity to exterior slabs, pavements, and isolated footings and piers, contribute as well. <br />C.6.a. Frost Heave Mitigation <br />To address most of the heave related issues, we recommend setting general site grades and grades for <br />exterior surface features to direct surface drainage away from buildings, across large, paved areas and <br />away from walkways. Such grading will limit the potential for saturation of the subgrade and subsequent <br />heaving. General grades should also have enough "slope" to tolerate potential larger areas of heave, <br />which may not fully settle after thawing. <br />BRAUN <br />INTERTEC <br />