Laserfiche WebLink
l ; <br /> -L„:„s„ <br /> civil structural <br /> MEMORANDUM <br /> y0¢�0E WAS,j,1 C'r <br /> TO: Marty Houghton P -.. coo <br /> 4: !►i. signed. Jot'. <br /> FROM: Kelsey Miner,PE w *; iaki;PE, <br /> 019.03.2- <br /> Jordan <br /> 19.03.2-Jordan M.Janicki, PE,SE v 07'00' <br /> p 46132 F� <br /> DATE: March 25,2019 �O� GCrtiRAL C\�\14v <br /> �SS"ONAL ENENG <br /> RE: Houghton Addition at 332 Madison St, Everett,WA 98203 <br /> DCG was provided with architectural plans(Sheets A1.0 to A4.0) dated 2/26/19 from Marty Houghton and created <br /> by Architecture Studio of Everett for a project located at 332 Madison Street in Everett,WA 98203.This project <br /> involves renovating the existing garage and connecting the existing garage and house with a new garage space. <br /> DCG has been asked to determine if the existing walls and their foundations(with the added loading from the new <br /> roof)are adequate. Additionally,DCG was tasked with determining if lateral improvements are required in the <br /> existing structures due to this addition. <br /> Gravity Analysis: <br /> To determine if the existing bearing walls are adequate,DCG calculated the load on these walls due to dead load <br /> and snow(25psf)and then analyzed them in StruCalc 10.0.In all cases,the walls are acceptable provided that they <br /> have at least 2x4 studs at 16" on center. For the foundations,an allowable soil pressure of 1500 psf was assumed <br /> (per the Table R401.4.1 from the 2015 IRC).The existing walls require footings that are at least 8"wide,while the <br /> new footing requires a footing that is 6"thick and 14"wide(which exceeds the minimum requirements of Table <br /> R403.1(1)from the 2015 IRC).The contractor must verify that these walls have at these minimum stud spacings <br /> and foundation sizes and should immediately notify the owner and DCG if these minimums are not met. <br /> Lateral Analysis: <br /> Wind: <br /> The area of this structure exposed to wind will not increase with this addition.This addition is located internally on <br /> the structure,so the wind loads will be reacted by the existing structures and no wind analysis is required. <br /> Seismic: <br /> To determine if seismic analysis is required the total area(and so the weight)of the structure is compared before <br /> and the addition. If this increase is less than 10%,then no seismic analysis is required per section 1103.3 exception <br /> 2 of the 2015 International Building Code.The following calculations show that the increase in building area is only <br /> 8.87%,so no seismic analysis or upgrades are required. <br /> Seattle Whidbey Island Mount Vernon Federal Way <br /> 9706 4th Ave NE Suite 300 PO Box 1132 2210 Riverside Drive,Suite 110 31620 23rd Ave S,Suite 307 <br /> Seattle,WA 98115 Freeland,WA 98249 Mount Vernon,WA 98273 Federal Way,WA 98003 <br /> Tel 206.523.0024 Tel 360.331.4131 Tel 360.899.1110 Tel 206.523.0024 <br />