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Mattson <br />Macdonald <br />Young <br />structural <br />engineers <br />Bassett Creek Business Center <br />901 North 3rd Street, #100 <br />Minneapolis , MN 55401 <br />612-827-7825 voice <br />612-827-0805 fax <br />Council <br />Exhibit F <br />Date: March 10 , 2011 <br />Brickhouse Architects <br />818 w. 46 th St. #204 <br />Minneapolis , MN 55419 <br />Denny Claridge <br />To: <br />Attn: <br />From: <br />Project: <br />Proj. No: <br />Subject: <br />Eric Bunkers <br />Kozlak Residence <br />1635 Bohns Pt. Rd. <br />Orono, MN 55391 <br />11101 <br />Proposed Remodeling & Addition <br />Dear Denny: <br />As requested , we met you at the above referenced project to visually review the existing structure for a <br />proposed addition and remodel. We have analyzed existing structural members using a roof and floor dead <br />load of 15 psf , a roof snow load 35 psf, and a 40 psf floor live load in accordance with the Minnesota State <br />Building Code. Our work only includes analyzing the existing members as shown at the above reference <br />project and is based on drawings provided by you and our site visit on March 10, 2011. <br />It is our understanding the existing 2 story structure was built in the 1940's and was added onto several <br />times . The existing structure is constructed using wood beams, round steel columns , wood stud bearing <br />walls, and 8" and 12" load bearing masonry foundation walls. The existing footings have been analyzed as <br />typical 16" wide x 8" deep spread footings based on a presumptive load-bearing value of 2000 psf in <br />accordance with Table R401.4 .1 of the IRC. The existing footings have been assumed to be typical spread <br />footings on good soils that appear to be performing adequately with the current loads. <br />After reviewing the proposed drawings for the remodel and addition , we recommend having the existing <br />foundation walls and footings removed to support new loads at the remodeled structure for the following <br />reasons: <br />1. The calculated footing loads on the existing footings are above the typical presumptive load-bearing <br />value of 2000 psf in Table R401.4.1 of the IRC . <br />2. Many existing interior 4" masonry load bearing walls will be overstressed with additional loads from <br />the remodel. <br />3. Cantilevered 12" exterior masonry foundation walls that retain soil are unreinforced and have <br />inadequate footing sizes to support cantilevered soil pressures. <br />4. Intersecting masonry foundation walls are not toothed together , many have large gaps at the addition <br />locations. <br />5. The existing older masonry walls do not typically meet the compressive strength shown in IBC Table <br />2105 .2.2 .1.2 , which is often needed for supporting high point loads . <br />6. Existing foundation water proofing is likely inadequate. <br />7. Bringing the proposed lower floor elevation up requires the existing basement slab to be removed , <br />thus the potential for damaging the existing hollow masonry foundation walls is very high . <br />Compacting soil on top of an existing concrete slab is typically not recommended by soils engineers .