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F51j <br /> Becklin & Whitney J r ,rJ 0titi <br /> Consulting Engineers,Inc. <br /> 139 1ST AVE.E,SUITE 100 <br /> P.O.Box 471 <br /> CAMBRIDGE,MN 55008 <br /> PHONE(763)689-5631 FAx(763)552-5631 <br /> January 9, 2018 <br /> Craig Schaper, P.E. <br /> Schaper Engineering LLC <br /> P.O. Box 26 Revi^C,isd for Code <br /> Mound, MN 55364f eco <br /> no <br /> City ®n ics�r"" <br /> 0 <br /> RE: Todd and Laura Gerhard Date / <br /> 3955 Cherry Avenue .19F <br /> Orono, MN Reviewer" AL <br /> To Whom It May Concern: <br /> Introduction <br /> We were asked to issue repairs for damaged floor trusses at 3955 Cherry Avenue, Orono, MN. <br /> We visited the home on Wednesday, January 3 and viewed the inside of the home. <br /> Observations <br /> Eight truss plates on the top chords of the trusses that support the kitchen are buckled and top <br /> chords are offset. One of the floor trusses has been field repaired by the addition of a 2x6" scab <br /> nailed to the bottom chord. A supporting post has also buckled and a structural support is <br /> missing. The wood flooring in the kitchen is not within acceptable flatness tolerance and has <br /> visible inconsistencies. <br /> Discussion <br /> The floor trusses supporting the kitchen are comprised of(3) different truss types- F9, F10 and <br /> F 11 as indicated in attached P&M 1st Floor Truss Layout. Granite countertops were installed <br /> on the center island of the kitchen. The granite tops add a surcharge to the dead load which was <br /> designed for in the F10 and F 11 trusses but not the F9 truss. Analysis of the F9 truss indicates <br /> that it is over stressed with existing loading. Additionally, one of the F10 trusses has a <br /> damaged bottom chord connection. The design of the main level calls for trusses of varying <br /> span with a fixed point near the pantry as indicated in attached marked up floor plan. The <br /> trusses adjacent to the fixed point span a greater distance. Code allows for deflection of L/360 <br /> in these trusses. This deflection occurs in the hall between the center island and the fixed point <br /> in the pantry. This condition results in loading that wood flooring is not intended to support. <br /> The combination of the damaged trusses, overstressed F9 trusses and the fixed point adjacent to <br /> deflecting trusses has resulted in a loading condition that the hardwood flooring is not designed <br /> to carry. The repair of the trusses will not restrict deflection in the trusses. The fixed point near <br /> the pantry and adjacent deflection in the trusses will remain but to a lesser degree. <br />