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1197 Spoonbill Cir - 2009-12-30 Joist AnalysisMCCONKEY JOHN INC. CONSULTING ENGINEERS 241 CLEVELAND AVE. S., SUITE B2 ST. PAUL, MN 5 5 1 0 5 - 1 2 6 0 651.698.5626 FAX:651.698.5628 4 Integrity Home Services 803 Central Avenue South New Prague, MN 56071 Attn: Duane Larson Re: law Spoonbill Circle -Joist MN Ihvaject 9 Mr. Larson, sis December 30, 2009 At your request we performed a structural analysis of the existing floor joists at the referenced residence. You have asked our opinion regarding the capacity of the joists to support live and dead loads per the Minnesota State Building Code (MSBC) in light of the existing holes in the joists that were made for running wiring. Our analysis was based on the following information provided by your group regarding the existing conditions: • Joists are 2x10's at 16" o/c • Joists span 15 feet • Joists have 1" diameter holes for wiring that are approximately 6 feet from one end condition. The center of the hole is approximately 1 -1/2" from the bottom of the joist. Also, our analysis was based on the following assumptions (Please contact our office if we have made any incorrect assumptions): • There are no extraordinary loads on the floor above (thick -set tiling, heavy appliances, etc.) • The floor joists carry no additional loads from other floor levels • The joists were properly sized to support live and dead loads per the MSBC (the correct species of wood was chosen to span the 15 feet between supports) Results of analysis and recommendations The results of our analysis showed that the existing joists are not capable of supporting live and dead loads per the MSBC with the penetrations for the wiring. We recommend adding 2x8 joists xl 1' -0" long to the original 2x10's (center on the 15 foot span). The new joists shall be spruce- pine -fir #2 material or better and may be ripped to 6 -3/4" depth if it makes installation simpler. The new joists shall be flush with the top of the existing 2x10's. Attach the new joists to the original members with (2) 16d common nails at 12" on center (2" from the top and bottom). Space the first 3 pairs of nails at 4" on center at each end of the 24$'s. Please contact our office with any further questions or comments regarding this topic. Respectfully Submitted, 4 1( 0( Richard W. Johnson, P.E., Principal //// Minnesota Registration #23406 / Q