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ISSP" v� <br /> �n �' INNOVATIVE STRUCTURAL SOLUTIONS, P.A. <br /> � vas 7� 111 Thomas Park Drive • Monticello, MN 55362 • Phone:763.295.5003• Fax:763.295.5004•www.isseng.com <br /> August 3, 2004 <br /> Mr. Ron Potas <br /> 2190 Shady Wood Road <br /> Orono, MN 55391 <br /> Re: review of foundation and first floor exterior walls for proposed remodeling <br /> D�ar Ron, <br /> This letter summarizes our review of the footings and foundations, as well as the first floor exterior <br /> walls for the single-family residence at the above address. It is our understanding that the existing flat <br /> roof structure will be removed and replaced with an additional floor and a new pitched roof structure. <br /> It is also desired to construct the new second floor framing 12" higher than the present roof framing <br /> elevation. The existing first floor wall framing consists of 2x4 wood studs, spaced 16" on center. <br /> There are no construction plans or information for the existing residence, but we understand that the <br /> existing foundation is constructed with 12" concrete block. There is no information available to <br /> determine footing widths used under the foundation walls, but typical footing sizes used for <br /> residential construction are 20" wide x 8" deep. The foundation wall heights are currently seven feet <br /> tall or less. This review is based on information and new remodeling plans from you, as well as our <br /> site visits on July 27, and August 3,2004. <br /> Our review is as follows: <br /> The change in load from the existing construction to the new proposed remodeling will increase <br /> foundation wall loads in the range of 150%to 170%. For a typical wall footing width of 20",this <br /> changes the soil bearing pressure from 800 pounds per square foot (PSF) to 1500 PSF. For the <br /> sandy-gravel type soils generally found in your area, the code allowed soil bearing pressure is <br /> ���0 ;'Sr. If �::, eY:s*i::b fc��•ti:.g •i:�?t?�� :s s* tP�r ,�„ ��t thP �Ppth ;� �r teast. R" rhi.c..k_, the <br /> existing footings are acceptable. <br /> There will be no change in grade elevation (retained soil height) around the existing basement <br /> foundation walls, so an increase in horizontal soil thrust load is not anticipated. The foundation <br /> walls are able to support the additional vertical dead loads and live loads due to the new <br /> construction. The current residential building code (2000 IRC) indicates a minimum foundation <br /> wall thickness for sandy-gravel type soils to be 10"thick. <br /> The existing first floor exterior walls constructed of 2x4 studs spaced at 16" on center are able to <br /> support the additional vertical dead loads and live loads due to the new construction. However, <br /> reinforcing of the stud walls will be required due to the increase in height. It is desired to place a <br /> 12" high knee wall above the existing 8' exterior wall construction. The interior and exterior <br />