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DEF 388 State St itri <br /> Ca�ytitoleenter <br /> & ASSOCIATESFENBpUGH, P( Salem OR 97301 <br /> IAR<errEcrut( • PLARKIRG Client-centred design www.da-erch.com <br /> August 19,2009 <br /> Scott Munger <br /> Marion County Bldg. Inspection <br /> Re: Chemeketa Community College <br /> Building 43 Addition—09-02047 <br /> Mr.Munger, <br /> The purpose of this letter is to request approval of an alternate method in construction of the required 3- <br /> hr rated wall(GA File No.WP-2800,UL No.U435)located adjacent to the existing pre-engineered <br /> metal building wall(PEMB). <br /> The reason for the request is due to the difficulty in constructing the new wall against the existing <br /> PEMB wall,while maintaining the integrity of the wall and the intent of the code. <br /> The above listed rated wall construction file numbers call for(3)layers of 1/2"gypsum wallboard on <br /> each side of a minimum 1.625"metal studs spaced at 24"on center. It is impractical to attach the inner <br /> ` (3)layers of gypsum wallboard to the 1.625"metal studs with the wall being located against the <br /> je existing PEMB wall. <br /> Following is a description of the proposed alternate method of construction of the 3-hr wall(See <br /> attached detail sketch SKI). <br /> The 1.625"metal studs will be positioned up tight against the existing PEMB metal wall panels <br /> (low/flat part of panel) @ 24"on center secured to each existing PEMB wall girt with#10 screws. <br /> (These studs will also act as a stabilizer during the construction of the 3-hr rated wall construction). <br /> Next,the Inner(3)layers of 1/2"type'x'gypsum wallboards get attached to the 1.625"metal studs as <br /> outlined in GA File No. WP 2800/UL No. U435. Next, the 6"metal studs will be installed @ 24"on <br /> center(to align with the 1.625"natl.Studs), The 6"metal studs will be attached to the.(3)layers of <br /> gypsum wallboard and 1.625"metal studs with#8 screws @ 12"on center(Forming a composite stud <br /> section).Finally,the outer(3)layers of type k'gypsum wallboard get attached to the 6"metal studs as <br /> outlined in GA File No.WP 2800/UL No. U43S(The 6"metal studs form the structural supports for <br /> the(3)layers of gypsum wallboard each side). <br /> We feel that the above mentioned alternate construction method of the 3-hr.rated wall framing meets <br /> the intent of the code,while feasibly allowing the wall to be constructed. Please call our office if you <br /> have any questions or concerns, <br /> (0 <br /> DBFFENBUAGH&ASSOCIATES,P.C.ARCHITECTURE <br /> �.: ©y,tj° , \oC\ <br />