2101 LEXINGTON AVE 2021-09-24 - Laserfiche WebLink

• • MULHERN KULP RESIDENTIAL STRUCTURAL ENG'NEERING 300 Brookside Avenue,Building 4,Ambler,PA 19002►p 215-646-8001 ►mulhernkulp.com July 28,2020 Alex Scofield YEN DESIGN INC. 17191 Bothwell Way NE.#B104 Lake Forest Park,WA 98155 2101 Lexington Ave Everett,WA PLAN REVIEW COMMENTS M+K Project#: 251-20006 Reference Structural Plans,designed by Mu/here&Ku/p Plan Review Comments,dated 7/02/2020 Alex: Pursuant to your request,we are providing this letter to address the structural items resulting from the above referenced plan review comments for the above referenced townhomes in the City of Everett,WA.Below,please find the review comment,followed by our response. PLAN REVIEW COMMENTS ■ Comment 1:The General Structural Notes on sheets 1.0 states that the design was performed to the IRC However,it appears the structural design has been performed to the IBC and the AWCNDS-15, The 2015 IBC should be referenced in the notes. See IRC Section 30113. Response: This is a residential structure designed under the IRC.The lateral design is a component of the design that was engineered,as permitted by section 301.1.3.Please see the updated notes for clarification. ■ Comment 3:The vertical load path for the proposed roof includes supportbythe existing structure on the west side, Details for the proposed connections,including modifications to the interior wall covering to instal/blocking,should be included in the construction drawings Calculations substantiating the connections should be submitted for review, See IRC Section 106.11 and IBC Section 10721. Response: Modifications to the interior wall covering to instal blocking shal be made under the discretion of the builder or architect.The worst case vertical loading of a post that is fastened back to the existing structure is approximately 2.2 kips.As speared by the structural plans,the covered porch posts adjacent to the existing structure are to be fastened to the existing structure with(1)Y4"x6"SDS screw @ 12"o.c.Assuming an 8 foot plate height,a minimum of 9 screws shall be utilized in the connection,which has a capacity of 2.5 kips.This translates to approximately 275 lb per screw.A note has been added to the plan to clarify that the 2x blocking shall be fastened to adjacent studs w/(3).131"x3"long toenais at each side,which has the capacity to transfer the load back into the wall studs,as required.Therefore,the connections are sufficient in transferring any vertical load from the covered patio addition to the existing wall and into the existing foundation below.