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18249.10 Everett Housing rity October 5, 2018 <br /> Comment Response (1age 4 of 8 <br /> 12. Continuing with the previous comment,Sheet A-1 shows one of the roof posts being supported by a <br /> new 4x8 beam on (2)2x posts. The posts do not continue to the foundation per Sheets A-2 and A-4, <br /> and one or both of the posts appear to bear on the floor joists. The load path should be reviewed. <br /> Calculations substantiating all framing in the load path should be submitted for review. The <br /> drawings should clarify that posts are required at both ends of the new beam and specify support <br /> connections. See IBC Sections 107.2.1, 1604.1,and 1604.4. <br /> The framing has been updated and checked to show a load path down to the foundation for the <br /> posts supporting the roof framing. <br /> 13. The roof framing plan on Sheet A-7 appears to indicate trusses east of the existing wall line and 2x <br /> framing west of the existing wall line. However,Section B-B/A-6 indicates the roof construction <br /> consists of only roof trusses. The required construction should be reviewed and revised. See IBC <br /> Section 1603.1. <br /> Please see the updated roof framing plan showing the updated truss layout. <br /> 14. The overframing design on Sheet A-7 is incomplete. The framing appears to require ridge members <br /> and a vertical load-bearing element at the intersection of the ridge members. Connections shall be <br /> specified between the framing. The west end of the west-most ridge member may bear directly on <br /> the sheathing; blocking shall be provided at the load point as needed. The structural design shall be <br /> reviewed and revised as needed. Calculations substantiating the design of the overframing <br /> members shall be submitted for review. Note that the 2x8 joists have spans up to 16 feet that <br /> appear to be overstressed. See IBC Sections 107.2.1, 1603.1, 1604.1, 1613.1,and 2306.1,ASCE 7-10 <br /> Chapter 30,and AWC SDPWS-15 Section 3.4.1. <br /> The overframing will be truss overframing,and the existing roof members have been checked to <br /> support the additional dead load from the overframing. See the attached structural calculations. <br /> 15. The roof plan on Sheet A-7 specifies roof trusses spanning 41.5 feet.The trusses ae non--uniform <br /> and have interrupted top chords due to the roof geometry. It is not clear that the roof construction <br /> can performed as specified for the required span. Note that the first two trusses will be <br /> approximately 24-inches deep or less. Preliminary design documentation including manufacturer's <br /> literature substantiating the feasibility of the design shall be submitted for review.See IBC Sections <br /> 104.11 and 1604.1. <br /> Please see the updated roof framing plan showing the updated truss layout. <br /> 16. Continuing with the previous comment,holdowns shall be specified for the roof trusses to resist <br /> uplift loading due to wind. Calculations substantiating the holdowns shall be submitted for review. <br /> See IBC Sections 107.2.1, 1604.1, 1613.1,and 2306.1,ASCE 7-10 Chapter 30,and AWC SDPWS-15 <br /> Section 3.4.1. <br /> Please refer to detail 1/S5.1.Trusses shall be attached to exterior walls with Simpson H2.5A <br /> hurricane ties. <br /> 250 4th Avenue South,Suite 200 <br /> Edmonds,WA 98020 <br /> O ph.425.778.8500 I f.425.778.5536 <br /> ENGINEERING <br /> www.cgengineering.com <br />