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3�3� �s�o <br /> Mattson Macdonald Young ,�- <br /> structural engineers ;��i: <br /> Basset Creek Business Center <br /> 901 North 3rd Street,Suite 100 <br /> Minneapolis, MN 55401 <br /> 612-827-7825 voice <br /> 612-827-0805 fax <br /> memorandum <br /> Date: December 5, 2007 <br /> To: Doug Dzurik <br /> From: David Macdonald <br /> Project: Thompson Residence <br /> Proj No: 07299 <br /> Subject: Header under the East wall of the Living Room <br /> Doug: <br /> I received a phone message from Bruce with the City of Orono. He asked that I review the double 11 7/8" <br /> Lvl beam placed within the deck framing under the new east wall of the living room. He noted that this Lvl <br /> beam is the one indicated on the drawing that I provided S2c. He further indicated that this Lvl will be <br /> supporting loads from six roof trusses, each imposing a load of 1600 Ibs on the wall above that is supported <br /> by these Lvl's. <br /> I have reviewed my calculations and find that the Lvl's, spanning 13'and supporting the weight of the roof <br /> trusses as well as the dead weight of the wall above will be acceptable. My calculations indicate that the <br /> Lvl's will be loaded to within 98% of the maximum allowable load. The total load deflection will be 4%over <br /> the maximum deflection recommended however, since the live load deflection will be within the L/360 <br /> criteria, I judged the total load deflection to be acceptable. <br /> I will attempt to cali Bruce to explain the results and make sure he is satisfied with this answer. <br /> If you have any questions concerning the above, please do not hesitate to contact me. <br /> Sincerely, <br /> Mattson Macdonald Young, Inc. <br /> .�.y,% /'7 i (�+a.��.�. <br /> � <br /> David H. Macdonald <br /> mm12-05�.doc Page 1 of 1 <br />