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FROM ��T/S/C ENGRS <br />� PHONE N0. : 425 267 3393 <br />Towner\Schuld\Canfield, LLC <br />CONSULTING ENGINEERS <br />December B, 2000 <br />Ga{{nQy Co�nstruction <br />10511-19 Ave. SE Suiie C <br />Everett, WA 98208 <br />Subjeet Project No. C99055 <br />7404 Evergreen Way <br />Letter No. 2 <br />Meehanfcal Unit SuppoAs <br />Attachmeots: Detai14/52 <br />pttantion: �dr. Pete Gaffney <br />Dec. 08 2909 12:01PM P2 <br />� <br />a Limited LiablOty Company <br />in Structurat Analysis and <br />Gentlemen: <br />Purs�ent to the request of Mr. Pete Gaffney, we h�a�tre� ew d ne are as folfodws: ns and proposed <br />rooftop mechanical tnstaltations for the subjed p j 9 <br />�. F�cisGng rooftop units weigh approximately 600 pounds each, and each is supported by two <br />trusses. This amounts to approximately 3 pounds per square foo� <br />2, Based on approximations using existing dimensions and lumber observed in buitding, ihe <br />existing trusses are designed for approximately the current dEsign snow and dead loads. <br />3. New rooftop units wi�l atso weigh approximately 600 pounds, and should Ge installed tn a manner <br />that does not exceed a net 3 psf load on the supporting trusses. <br />We re,commend placing each unit on a 4x10x15' spreader beam. This beam should be in tum supported <br />by at least seven of the existing roof trusses. Non9 of the exisBng Uusses should be supporting more <br />than one unit, f.e., two spreadar beams. The center of gmvity of the rooftop unit should be Ixated within <br />stx ir.ches of the middle ot the beams, and within six fnche.. �f the m(d-point behveen the beams. <br />Spr�ders may be toe-naiied to each iruss to fasten in place. Curbs nortnally used for the rooftoP uads <br />may be placed directiy on tfie sprEader beams. Please see attaohed detaD 4/S2 for clarification. <br />Should you have any questions or desire addiGonal informaUon, plesse do not hesitate to contact us. We <br />trust this fulfilis your request for engineerin9 for support of the new units, and in that regard, it Is <br />Respectfully Submttted, <br />�� G� <br />Clayton M. Canfield <br />Page 1 of 1 �, <br />� � iZ <br />