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. , <br /> � y ^ <br /> , . <br /> � ,� i _ � ;� : _�4` <br /> EXTERIOR ENVELOPE AVERAGE "U" COMPUTATION <br /> OWNER Jim & Judy Brass <br /> SITE ADDRESS 1495 Green Trees Road, Orono, MN 55391 <br /> CONTRACTOR Boyer Building Corp. PHONE 952-475-2097 <br /> 3435 County Road 101, Minnetonka, MN 55345 <br /> Existing and New Building <br /> Compiled Alternate Building Envelope Design <br /> To utilize the total envelope system method, the values established by the sum of <br /> items #3 and #4 shall not be greater than the sum of items#1 and #2. <br /> Working minimum rerquired "U" values <br /> Existing house <br /> #1 + #2 = 649.65 <br /> Addition <br /> #1 + #2 = 135.71 <br /> Total "U"#1 & #2 = 785.36 <br /> Calculated actual "U" values <br /> Existing house <br /> #3 + #4 = 609.26 <br /> Addition <br /> #3 + �#4 = 175.45 <br /> Total "U"#3 &#4 = 784.71 <br />