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Kraus-Anderson Realty Company <br /> Project BL-11-01014 <br /> March 18,2011 <br /> Page 11 <br /> to exert a maximum allowable soil bearing pressure of 3,000 pounds per square foot(PSF). This value <br /> includes a safety factor of at least 3.0 with regard to bearing capacity failure. <br /> D.3.b. Embedment Depth <br /> For frost protection,we recommend embedding perimeter footings a minimum depth of 42 inches below <br /> the lowest exterior grade. Interior footings may be placed directly below floor slabs. We recommend <br /> embedding building footings not heated during winter construction, and other unheated footings <br /> associated with canopies,stoops or sidewalks a minimum depth of 60 inches below the lowest exterior <br /> grade. <br /> D.3.c. Settlement <br /> We estimate that following the recommendations provided in this report, total and differential <br /> settlements of the proposed structure will result in less than 1 inch and 1/2 inch, respectively. <br /> D.4. Floor Slabs <br /> D.4.a. Subgrade <br /> After building pad preparation has been completed,we anticipate that floor slab subgrades will consist of <br /> native glacial soils and/or new engineered fill.We recommend using a modulus of subgrade reaction(k) <br /> of 100 pounds per square inch per inch of deflection to design the slabs upon these materials. <br /> D.4.b. Moisture Vapor Protection <br /> If floor coverings or coatings less permeable than the concrete slab will be used, we recommend that a <br /> vapor retarder or vapor barrier be placed immediately beneath the slab.Some contractors prefer to bury <br /> the vapor retarder or barrier beneath a layer of sand to reduce curling and shrinkage, but this practice <br /> risks trapping water between the slab and vapor retarder or barrier. <br /> Regardless of where the vapor retarder or barrier is placed, we recommend consulting with floor <br /> covering manufacturers regarding the appropriate type, use and installation of the vapor retarder or <br /> barrier to preserve warranty assurances. <br /> We recommend that the vapor retarder or barrier be observed prior to concrete or sand placement so <br /> that holes,tears or gaps in the vapor retarder or barrier can be identified and patched or realigned as <br /> needed. We further recommend performing moisture vapor transmission tests after the concrete slabs <br /> have cured, but prior to the flooring installation. Flooring manufacturers typically recommend upper <br /> BRAUN <br /> INTERTEC <br />