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743 Cheshire Ct - Re: Holmsten Residence RemodelingMarch 24, 2010 Attn: Steve Zawadski (Zawadski Homes) From: Bernie Stroh, P.E. (Stroh Engineering) Re: Holmsten Residence Remodeling — 6x6 Post Support Memo: As requested, I have reviewed the support of the 6x6 post on the basement concrete floor slab. It is my understanding that the maximum design load is approximately 3600 lbs. Due to the difficulty of constructing a concrete footing at this location, it is my understanding that the 6x6 wood post is supported on three treated 2x12's laid flat on the concrete floor to distribute the load. I have reviewed the built —up wood base detail and according to my calculations, this would provide adequate support for the load— bearing post and would not result in any signficant stress in the concrete slab and the net soil bearing pressure would be less than 2000 psf which is acceptable for most normal soil conditions. To be conservative, I have assumed 2500 psi concrete and a 3" basement floor slab. SUMMARY OF STRESSES: (BASED ON SERVICE LOADS) EFFECTIVE CONCRETE BEARING STRESS: 17.8 PSI (ALLOWABLE BEARING STRESS: 1300 PSI) CONCRETE PUNCHING SHEAR STRESS: 16.6 PSI (ALLOWABLE SHEAR STRESS: 63 PSI) EFFECTIVE 2X12 BENDING STRESS: 850 PSI (ALLOWABLE BENDING STRESS #2: 975 PSI) MAXIMUM SOIL BEARING: 1800 PSF (ALLOWABLE SOIL BEARING: 2000 PSF) I hereby certify that this plan, specification or report was prepared by me or under my direct supervision and that I am a duly registered engineer under the laws of the state of Minnesota. CO 3/24/10 Bernie Stroh, P.E. REG. NO. 14269 Date PROJECT. 6X6 ST SUPPORT AT STROH 1t28 Sibley hts. l Highwayy Mendota Hei MN 551 i 6 Phone 6 ENGINEERING stroheng 454 -5086 mcast.net N RESIDENCE REMODELING 743 CHESHIRE COURT EAGAN, MN r: s, • PEuTIOAS DIVISION SK1