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NOTCH <br /> ENGINEERING =� <br /> CO1250 Morningview Drive � <br /> ■ Mound. Minnesota 55364 . ' <br /> (612)472-5566 ��i_� .:....� <br /> December 7 , 1992 v <br /> D E C 9 `s�9? <br /> Mr. Lvle Oman, Building Official <br /> City of Orono <br /> 1335 South Brown Road <br /> Crystal Bay, Minnesota 55323 <br /> Re : Mr . Tro�- ?.nderson' s Residence <br /> 1490 Long Lake Boulevard <br /> Orono , Minnesota <br /> Mr. Oman, <br /> Notch Engineering Co . made a field observation at the above <br /> referenced residence on December 3 , 1992 in order to determine <br /> if the existing foundation was capable of supporting a second <br /> floor addition. From the cellar of the residence I was able to <br /> view the continuous wall footing and masonry foundation wall . <br /> In one location on the wall behind the furnace the soil had <br /> been excavated vertically from the bottom of the wall footing <br /> to the slab on grade below. This condition is not acceptable <br /> and should be corrected by pouring a six inch thick poured wall <br /> adjacent to the exposed vertical face of soil . The new wall <br /> should be reinforced with #3 rebars at 10" o . c . each way. The <br /> rebars should be centered in the wall thickness and should be <br /> drilled and epoxy �routed into the side of the existing wall <br /> footing above and doweled into the slab on grade below. <br /> It was noted that the existing footing does not meet the <br /> current building code frost depth requirement of 42 inches <br /> below grade to the bottom of the footing , however , this house <br /> was built in 1951 and no frost induced foundation problems have <br /> occurred to date. as long as the grades are not altered in any <br /> way that would affect surface drainage and the underside of the <br /> first floor is not insulated, I see no reason to underpin the <br /> existing foundation to meet the 42" depth requirement . <br /> In conclusion, the existing foundation system will be capable <br /> of supporting the proposed second floor addition. I was told <br /> that the second floor trusses and roof trusses will clear span <br /> the entire residence and I prepared my calculations in <br /> accordance with this information. <br /> If vou have anv questions or comments on this correction please <br /> feel free to contact me . <br /> Sincerel�- �roiirs , <br /> ���i�'mQQ�G. i���o� <br /> "lhvrnas E . �;otch , I'. E . <br /> Structural Engineer <br /> cc : file STRUCTURALDESIGNSERV/CES <br />