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<br /> <br />however, by site conditions such as large trees <br />preventing or limiting access by the excavat- <br />ing and earth moving equipment, the need for <br />dewatering, the presence of rock, etc. <br /> <br />2. Construction of the new foundation, and <br />attaching the elevated structure - <br />Foundations for elevated residential <br />structures can be constructed by a variety of <br />methods, and with a variety of materials, The <br />costs would be dependent on site conditions, <br />materials used, and labor costs; and will differ <br />for different regions of the country. Research <br />conducted for the Coastal Construction Man- <br />ual (1986) sampled cost data from a number <br />of sources. Concerning those data, the manual <br />states as follows. <br /> <br />"The cost information presented here <br />serves only to give the reader a general idea of <br />the cost of coastal storm-resistant construc- <br />tion. These data cannot be directly applied to <br />estimating costs of a structure in a specific <br />community." .. <br /> <br />According to the manual, the cost of <br />reinforced concrete grade beams ranging in <br />size from 8x 16 to 24x24 inches cost from <br />$7.70 to $27.50 per linear foot. Reinforced <br />concrete masonry unit (concrete block) piers, <br />typically 8x 16 or 12x 12 inches, could cost <br />from $2 to $14 per linear foot including the <br />footing. Reinforced concrete piers (l2x24 <br />inch) could cost from $14 to $48 per linear <br />foot of elevation. ' <br /> <br />3. New or raised utilities, and raised air-con- <br />ditioning equipment - <br /> <br />Again according to the Coastal Con- <br />struction Manual, raising the water utility <br />costs from $4 to $8.80 per foot; the sewer <br />utility costs $6 to $16.50 per foot; the gas <br /> <br />utility costs $4 per foot; and the electrical <br />utility costs $3 per foot.' <br />Varying permit requirements, protec- <br />tion against freezing, etc. may influence costs <br />for these items in various regions of the U.S. <br /> <br />4. Architectural modifications _ <br />These include enclosing the area <br />beneath the raised floor slab (with breakaway <br />walls if required); new entrance ways, stairs, <br />landings, porches, and patios; new sidewalks <br />and driveways; etc. Breakaway walls would <br />cost about $.75 per square foot for lattice <br />work, $1,50 to $2.00 per square foot for stud <br />wall and plywood sheathing, and $2.70 to <br />$3.10 per square foot for block walls.' <br /> <br /> <br />5. Landscaping and site restoration- <br />These costs are highly variable. <br /> <br />COST ESTIMA TES <br /> <br />Detailed cost estimates for elevating a <br />hypothetical residential structure in place two <br />feet and ten feet above grade are shown in <br />Tables I and 2. <br />The estimates assume the structure to <br />be 36x36 feet, single story (1,296 square feet), <br />with a detached garage. The foundation is as- <br />sumed to be typical slab-on-grade with a <br />perimeter grade beam and interior beams <br />beneath bearing walls poured monolithic ally. <br />The new foundation consists of 14- <br />inch square reinforced concrete piers with 2- <br />foot square by 8-inch deep footings set 3'-10" <br />below grade. The piers are 9 feet on centers <br />both ways, for a total of 25 piers. <br />The project site is assumed to have no <br />unusual or difficult soil conditions, and to <br />have adequate clearances for equipment and <br />operations. <br />The equipment required for elevating <br />structures is highly specialized and expensive. <br /> <br />7 <br />