HomeMy WebLinkAboutFile Documents.1411 Crystal Lake Rd.0062.2018 (6).ARBK DEW POINT CALCULATION � RADER0
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JOB NAME: Smallwood House ® l/I ENGINEERING •COMFORT SYSTEMSINE
JOB NUMBER: 17082.00
DATE: 2/21/18
CALCS BY: JSW
DP @ DP @ DP @ DP @ DP @
20% RH 25% RH 30% RH 35% RH 45% RH
30 33 37 41 48
Outdoor design temperature (ODT) 0
Indoor design temperature (IDT) 70
Delta T = IDT- ODT 70
Thermal Resistance of Proposed Roof Assembly
Layer R-value
Outside air layer 0.17
Roofing 0.00
Roof Underlayment 0.00
3/4" plywood 0.94
3"tapered rigid insulation (R-5/in) 15.00
Spray polyurethane foam insulation 21.00
A: point of condensation analysis
Vapor barrier 0.00
Fiber batt insulation 13.00
5/8" gypboard 0.56
Inside air layer 0.61
R-Total 51.28
R-value at A 14.17
TA=Temperature at point A -0,00 LJCF���
TA= IDT- (R-value at A)/(R-Total) * (Delta T) 51 V � PN J'HO•tiAo TO
DPA = Dew point at point A(35% RH) 41 m 8�c 2/21/1 ; /t�
Is TA warmer than the DPA? YES I i 39,�;
14,
•
Note: To minimize the potential for condensation problems, •. .....
humidity levels within the home must be properly controlled 4%`ONAL.04
and adjusted based on outdoor temperatures.
RECEIVED
3/29/2018
ASPEN
BUILDING DEPARTMENT