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1. 0k. <br /> r 0 A O <br /> CITY of ORONO <br /> A 111'- <br /> 'til�r Municipal Offices <br /> 1 6Y <br /> •,� � Street Address: Mailing Address: <br /> 44,631.104' 2750 Kelley Parkway P.O. Box 66 <br /> Orono, MN 55356 Crystal Bay, MN 55323-0066 <br /> October 15, 2007 <br /> Kara O'Brien <br /> 1140 Willow Drive S. <br /> Wayzata MN 55391 <br /> Dear Ms. O'Brien: <br /> I have inspected your existing roof and decking at the request of your contractor. The <br /> part of the roof that had the existing shingles tore off indicated that part of the roof is <br /> plywood sheathing and part dimensional lumber. The 2006 International Residential <br /> Code (IRC, recently adopted July 10, 2007) calls for materials in roof assemblies to be <br /> compatible with each other, Chapter 9 section R904 subpart R904.2. The dimensional <br /> lumber is thicker than the plywood, resulting in a ridged appearance. <br /> The 2006 IRC also states that asphalt shingles must be fastened to a solidly sheathed roof <br /> deck. The part of the roof deck that is already sheathed in plywood can remain as it <br /> meets the required thickness and appears to be in good condition. The decking to be <br /> replaced now does not have to be plywood. It can be OSB if the thickness matches the <br /> existing plywood. <br /> If there are any further questions please feel free to contact me. <br /> Sincerely, <br /> k../.16(./ <br /> Willie Gibbs <br /> Inspections <br /> Telephone(952)249-4600 • Fax(952)249-4616 <br /> www.ci.orono.mn.us <br />