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A �� <br /> � , �s '� � � <br /> � ����� � <br /> En ineerrn Partners Internati ��� <br /> g g onal LLC <br /> Engineers Consuitants t�lanager� <br /> June 2, 2004 <br /> Mr. Curtis Levang <br /> 4010 Bayside Road <br /> Maple Plain, MN 55359 <br /> Re: Roof Addition <br /> Levang Residence <br /> Dear Mr. Levang: <br /> It is my understanding that your plan to remodel your house by constructing a gable and <br /> dormer roof system thus replacing the existing flat roof and clerestories, has been <br /> suspended by the local building official until a resolution on the adequacy of the existing <br /> foundation wall has been rea.ched. <br /> On May 26, 2004, I inspected the house and the existing 8 in. thick concrete masonry unit <br /> (cmu) foundation wall. I have also had the opportunity to review the proposed plans, <br /> prepared by Scott Schneider dated May 4, 2004, for the proposed roof remodeling. <br /> Based upon that inspection and subsequent review of the drawings, it is my professional <br /> opinion that the existing 8 in. cmu wall is more than adequate to carry the proposed loads. <br /> The 8 in. cmu wall has an approximate allowable Fa compressive stress of 168 psi based <br /> upon an assumed value of�m =1500 psi prism strength. Assuming the new roof live and <br /> dead loads, attic live and dead loads from the old flat roof areas and the existing floor <br /> loads, the wall will experience approximately 50 psi compressive stress loads. This will <br /> yield a safety factor of more than 3.0. This analysis was done on the north foundation <br /> wall east of the fireplace, which by inspection would receive the greatest contributing <br /> additional loads. <br /> Therefore in my opinion, the new code requirements of a 12 in. cmu wall can be waived <br /> in lieu of the existing 8 in. cmu wall based upon my specific analysis of the actual <br /> proposed loading cond' - <br /> Very ly �i' ��� <br /> . <br /> / . !�i / <br /> - �� //�' _ ------_._.___ <br /> eei'ing P�rt rs International, LLC � <br /> Richard M. Greenlee, P.E. <br /> MN Registration No. 9952 <br /> 9724 Rich Curve phone 952.831.2471 <br /> Bloomington,Minnesota 55437 fax 952.897.1 152 <br />