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oftglid ii,;,,,i io,.- <br /> \S <br /> SERENA BUILDING COMPANY • 4605 WATERTOWN ROAD • MAPLE PLAIN, MINNESOTA 55359-9681 <br /> PROJECT MANAGEMENT • CONSULTING • 612-449-8952 • FAX 612-449-9215 • E-MAIL: DOC@SBC-MN.COM <br /> 6/25/1998 <br /> Mr. Lyle Oman <br /> City of Orono <br /> 2730 Kelley Parkway <br /> Orono, MN 55356 <br /> RE: Land Use Application#2364 <br /> Dear Lyle: <br /> Pursuant to our discussion of 06.26.98, I am in ongoing discussion with local engineers and hope <br /> to deliver a report to the city regarding Bruce's design concerns as soon as possible. <br /> With regard to the untreated sills installed in the screen porch; I have been unable to locate any <br /> treated 2x6 materials on the jobsite despite having purchase records. I can only assume there was <br /> a problem with delivery. The sills rest on an average 10"depth 4000#floor mix, and are secured <br /> with 1/2"anchor bolts and liberal quantities of PL-400 construction adhesive. <br /> According to the 1988 UBC General Construction Requirements §2516, ¶7,Wood and earth <br /> separation(unrevised): <br /> "... Where located on concrete slabs placed on earth,wood shall be treated wood or <br /> wood of natural resistance to decay.Where not subject to water splash or exterior <br /> moisture and located on concrete having a minimum thickness of 3 inches with an <br /> impervious membrane installed between concrete and earth,the wood may be untreated <br /> and of any species" <br /> As indicated in the attached drawing SK-3,the sill will be protected from contact with splash and <br /> exterior moisture. In a conversation with technical representatives from ChemRex Inc., <br /> manufacturers of PL adhesives and sealants, I was informed"PL-400 is a solvent based, synthetic <br /> rubber compound which, upon curing,passes or exceeds moisture penetration requirements"(see <br /> attached white paper). <br />