2012-00728 - addn/remodel/repair

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� � �� {p Bunkers & Associates LLC structura engineers 6687 Forest Street Farmington, MN 55024 651.366.2853 Date: May 30, 2012 To: Kuhl Design Build 1515 5`" St. S. Suite K Hopkins, MN 55343 Attn: Ashley Mitlyng From: Eric Bunkers Project: Myhran Residence 2280 Fox St. Orono, MN 55356 Proj. No: 12044 Subject: Proposed Remodeling Dear Ashley: As requested, we designed new structural members for the above referenced project. We have designed the new members using a roof and floor dead load of 15 psf, a roof snow load 35 psf, and a 40 psf floor live load in accordance with the Minnesota State Building Code. Our work only includes designing the new members as shown at the above reference project and is based on drawings provided by you. Attached are 6 framing sheets with annotated framing notes and 1 detail sheet showing the new members and connections. All framing shall be shored and temporarily braced as required by the contractor and all minimum nailing shall be in accordance with IRC Table R602.3(1). Lumber shall be minimum #2 SPF with treated lumber to be #2 S. Pine and engineered lumber to have Fb = 2600 psi with E = 1.9. Our calculations assume all lumber is of good quality and does not have large splits and checks and shall be visually inspected by the contractor at the time of construction. All fasteners in contact with treated lumber shall be G185 hot dipped galvanized or equal. Steel wide flange beams shall meet ASTM A992 and rebar shall be grade 60. Concrete used for footings (4"slump) and masonry core grout (8" slump) shall have a 28 day compressive strength of 3000 psi. The new footings have been designed as a typical spread footing based on a presumptive load-bearing value of 2000 psf in accordance with Table R401.4.1 of the IRC. The existing footings have been assumed to be typical spread footings on good soils that are assumed to be performing adequately. The contractor shall also verify the condition of structural members and foundations affected by the remodeling. Exterior grade shall slope away from the building and gutters with long downspouts should be used whenever possible. Foundation backfill shall be granular and the foundation system is assumed to have drain tile.