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Home My WebLink AboutB13-0358-Dew Point Calcs DEW POINT CALCULATION 5S� R��r JOB NAME: 1896 West Gore Creek (i� ENGINEERING • COIIRFORT SY5TEMSM JOB NUMBER: 13070.00 DATE: 8/27/13 CALCS BY: JAH DP @ DP @ DP @ DP @ DP @ 20% RH 25% RH 30% RH 35% RH 45% RH 30 33 37 41 48 Outdoor design temperature (ODT) -20 Indoor design temperature (IDT) 70 Delta T = IDT- ODT 90 Thermal Resistance of Proposed Roof Assembly Layer R-value Outside air layer 0.17 Roofing 0.00 3" rigid insulation (R-5/in) 15.00 3/4" plywood 0.94 6" spray foam insulation (R-7/in) 42.00 A: point of condensation analysis 5/8" gypboard 0.56 Inside air layer 0.61 R-Total 59.28 R-value at A 1.17 TA= Temperature at point A TA = IDT- (R-value at A)/(R-Total) * (Delta T) 6g.2 DPA= Dew point at point A(35% RH) 41.0 Is TA warmer than the DPA? YES ��c�+�"�? � �C. . �' .�iM�y��. "-.�� . �-y-.. • ^y� ..�. �/��a� �. s� � �`f '�..�� Note: To minimize the potential for condensation problems, ;=� 8/27/13 '`'�, humidity levels within the home must be properly controlled ; �� : k and adjusted based on outdoor temperatures. � :, ��,;, i��•, �'` �,•��' • _�. �k�l •�Yw��`�ry y +��V7\�-� .