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The weight of the new RTU is 204 pounds, the weight is spreading to 4 <br />joists as indicated on page 1 of the calc. See the revised calculation for the <br />existing roof joist to include the weight of RTU and the kitchen hood (with <br />double the loading conservatively), and the roof dead load and snow load <br />have been adjusted to the correct joist spacing of 16" ilo 24" as shown <br />previously. The result of joist is only 0.1 % overstressed. <br />3. The heater weight in the calculations is not clear. Note that if the actual weight is <br />closer to 200 lb, and the weight is distributed to only three joists, these joists may <br />be similarly overstressed. The calculation does not appear to consider other unit <br />weights loading the same joists as the heater. <br />Note that the suspended heater was eliminated by the owner on this <br />project. <br />4. Continuing with Comments 2 and 3, supplemental framing may be required. A <br />minor modification to the joists, such as adding sistered framing to the <br />overstressed joists, may be acceptable in the mechanical permit. More <br />substantial modifications and additions to the roof framing will require either a <br />separate building permit, or a revision to the previously issued Building permit <br />under File No. B2002-033. <br />With overstress is only 0.1% for the roof joist, supplemental framing is not <br />needed for the current condition. <br />RESPONSES IN RED FONT BY: <br />NT Engineers <br />Khoa K. Nguyen, PE <br />17614 NE 29th st <br />Redmond WA 98052 <br />