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Mr. Gary Gleason, P.E. 12 January 17, 2001 <br /> GME Project No. 9256 <br /> we also recommend that you contact the manufacturers of the specified <br /> floor coverings to determine how they wish to have the vapor barrier <br /> installed, since their preferred method may vary from the ACI . <br /> The floor slab have construction joints and control joints at spacings <br /> recommend by the Portland Cement Association and the American Concrete <br /> Institute, to reduce the potential for excessive curling and cracking. <br /> The slab should be cast independent of the foundation walls and footings <br /> of the building, to allow for relative movement between the structural <br /> members . <br /> Exterior Slabs and Patios <br /> In a previous section of this report, we presented our <br /> recommendations for constructing a subgrade of NFS sand for exterior <br /> patios and slabs . We recommend that these slabs be designed using a <br /> modulus of subgrade reaction of 150 pounds per cubic inch. The slabs <br /> should not be �attached to the building by mechanical connections or <br /> reinforcing steel . <br /> Pavement Subgrade <br /> The borings in the areas that will be paved indicate variable soil <br /> conditions, including silty sand, sandy silt, and clayey silt below the <br /> . OME CONSULTANTs,INC. <br />