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4' <br /> by one-third for short duration wind or seismic .loads. Con- <br /> tinuous perimeter footings -should -be -founded at least -18 inches <br /> .;below finished.-exterior grade_. :All,-continuous concrete ..footings <br /> r <br /> .should be doubly reinforced with one No. 4 -bar at both top and <br /> .bottom. Interior -spread footings should be founded a minimum <br /> of 18 inches below rough -pad grade. 'The footing width should <br /> .not be less than 15 inches. <br /> Any soft areas found while excavating footings should be <br /> r <br /> ,-removed and the excavations backflled .as ­engneered fill. <br /> "The recommendations contained in this :section are based on <br /> f . water not accumulating below the structures.. g <br /> It is desirable to place all concrete and engineered fill <br /> immediately after any excavation. The intent is to mimimize <br /> the time the excavation is exposed to the aix to prevent the k <br /> -native material -from drying out. <br /> i <br /> Slabs-on-Grade: All fills required to bring the .building <br /> { <br /> pad to ,final grade should be engineered fills. i <br /> :Interior slabs-on-grade should have at least one .inch of <br /> j <br /> :well-graded free-draining .concrete .sand placed .below the floor <br /> r <br /> ,slab. . An impervious .membrane should .be placed .beiow the sand. <br /> To aid .in concrete curing -and -finishing, the sand should be <br /> thoroughly wetted prior to pouring concrete. <br /> . -The exterior slabs should be poured separately in order to <br /> -act independently of the .wall and .foundation.. <br /> =5- <br /> r <br /> p - � <br />