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L <br />- 15 - <br />buildup of hydrostatic pressure in addition to the active pressure <br />should be considered. Surcharge loading should also be added. <br />INTERIOR FLOOR SLABS <br />The natural soils and claystone at the site possess erratic swell <br />potential and are capable of damaging slab-on-grade construction by <br />shrinking and heaving should they be subjected to change in moisture <br />content. The only positive method of preventing floor movement is the <br />construction of a structural floor with a void space beneath. The <br />following construction details are suggested to minimize potential <br />damage in the event of movement: <br />(1) All slabs should be separated from bearing members with a positive <br />• expansion Joint. i <br />(2) All slab bearing partitions should be provided with a positive <br />slip )olnt at the bottom of the partition to allow vertical move- <br />ment of the slab without affecting the upper structure. <br />(3) A minimum 4-Inch free draining gravel layer should be provided <br />beneath lightly loaded office or change house slabs to distribute <br />floor loadings. Greater thickness may be required in heavier <br />loaded nonstructural slab areas. <br />(4) Slabs should be adequately reinforced for the proposed use. <br />(5) Pos(tlve drainage conditions should be established to minimize <br />moisture infiltration adjacent to structures. <br /> <br /> <br />