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���� <br />E f1 G I!1 E E R 5 <br />� 3el!ewe <br />� Everett <br />; Spokare <br />' °cnlartl <br />=' San Dizgo <br />' Austin <br />%� <br />� <br />� <br />Febn+azy 10, 2011 <br />Getine[ ?.lewab <br />I'EC Mechanical <br />Redmond, WA <br />Subject: iIVAClnsralladon: 909SEEveren.t1c11 R'a� <br />Evereiy iYA 98208 <br />Mr. Alewab, <br />(vl 1 I Gz- ol �-f � <br />� <br />a <br />We were asked to review the ezisting roef swcture For the rzplacement o£ 1 existing units with an HP-1 ="+OS <br />Ibs. Th� original units weighed 53E lbs. We reviewed and analyzed the condition for lateral and graviry i�pacts <br />and determined wliat zetrofits (iCany) that wnuld be mquired. Additionally we detem:ined the curb/sleepe: <br />attachment reqnirencnts bazed on thc lateral design forces. <br />Resuft: <br />The rxsting sm�cnu�� is adequa�e to supper� thz loads ojthe netv �ni:s, Thc ranjt-usses tlmt primariiy are <br />supportirsg the ne�v unit ?xperiences a nct gam oj3316s per truss with thz cunent s(eepers that distribute d�e <br />weight over multiple trusses. Furthermare the impact on �he trusses tlrat typically are designed with jull foad <br />design laad ar weI! as jar �he additional paint toads (unit) are acceplable as the c.�rrently are due to the <br />marginal increase in Iaad oj(ess thars 590. �ldditiona7ly, wi�l: the assumption that rhe joorprint oj the unitr <br />vould not experience a snow laading (LL) due to the hecryou rould disregard �he live (oad :vhich jar the <br />surjace Jrea ojthe HP-1 is ut least 500 lbs. By doing t/iis you elvninated SOO lbs aJjthe supporting member: jar <br />d�e HP-1. Ay reasoning the additianal laading is less that the live foad xould have been over the area as thc <br />raojis structurally saund unless signs ojdefeciencies in the roojstructure are presenl. <br />The new =mies will be insral(ed in the same (acations as .he origina! units and wil! be insralled an the etisring <br />curb/s7eepers cannecled �o rhe raojstructure. In �ernu ojlhe altachmer.t requiremenu; use a minimum ojjQ) <br />sheet metal screws or wood scr�us (k10J ro each curb attachmenr/sleeper, minvnum (Z} oj�he sides ojthe unit. . <br />Sze attaci�ed calculation package with graviry and /atera! calcufa�ions including sketcFes and key-plans. <br />Please call me if you havc any fiuthe: questicn;. <br />Sincerely, <br />:1'� ans R Thi�" -f ell, P <br />Project Mana;r.r <br />DCI Engineers, S=�rle <br />1C9G0 NE 4;h Stret. Suite 12C9 Bdiewe, Wrshineten.98004 Phone (4251627-22°2 <br />_---- =-- ----- -,---__. __._._ <br />S e r v i c e I n n o v 2� i o n V a I u e <br />