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LEHNER � <br /> engtneering <br /> FIRE PROTECTION SPECIALISTS <br /> March 4, 1997 <br /> To: Dennis Carison, Proj. Mgr. <br /> CARLSON CONSTRUCTION <br /> Re: CARLSGN APARTMENTS EXTERIOR WALL RATINGS <br /> Everett, WA <br /> Dear Mr. Carlson: <br /> I have reviewed the construction details given me and compared them to the designated <br /> code requirements for the perimeter wall of your apartment house which is now under <br /> construction. The building is a Type V-1 hr., three stories high, with four apartment units. <br /> Two units comprise the iirst floor, and are separated from the upper level with a 1 hr. rated <br /> floor assembly. Two units comprise the second and third levels with a vertical separation <br /> between them, which is 1-hr. All construction within the building satisfies the code for Type V <br /> - 1 hr., including the inside surface of the perimeter wall. <br /> The exterior surface of the exterior wall did not receive a layer of 5/8" type X gypsum wall <br /> board under the vinyl exterior siding. Although the vinyl siding is U.L. listed with a 1 hour <br /> rating, that rating applies to its resistance to the propagation of flame to the underlying <br /> structure. A technical representative named Carol of the Certainteed Corp., Valley Forge, PA <br /> confirmed this via telephone this moming. <br /> I have examined relative chapters of the Uniform Building Code (UBC), 1994, and can <br /> recommend only one altemative to removing the siding and applying =. layer of 5/8" gypsum <br /> board. That recommendation is to extend fire sprinkler protection into tne attic and oiher <br /> applicable areas of the building so as to satisfy UBC Std. 9-1 requirements for an "automatic <br /> fire ex+.inguishing system° The building attic space is limited, although unheated. The water <br /> suppiy for the existing residential sprinkler system is 2" which should be adequate to protect <br /> the largest attic space. Dry upright sprinklers supplied from the existing wet sprinkler pipes in <br /> the attic (below an insulation blanket) are planned to accomplish this. My code analysis <br /> justifying this conclusion is as follows: <br /> ; <br /> (20G) iiG-7616 (800) 698-0569 FAX: 776-8577 18023 Hwy. 99 Building C Suite N Lynmvood, WA 98037 ' <br /> .'!��o4��F�Gm��vr'a�a�w�...rueon�.r.....��_.f_..uw.�.......�......�..........�.�.�... . �.��._ '� .. _ . � . .. . �_ . <br /> '�Y::�l...G.. ..: .'...-�:-' .. . -'.:' . .. � . .. . . . <br /> .r.♦ -.;. . . .. . � <br />