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Moisture Control in Low-Slope Roofing:
A New Design Requirement

A.O. Desjarlais and J.E. Christian, Oak Ridge National Laboratory
N. A. Byars, University of North Carolina Charlotte
This calculator performs the calculations described in Moisture Control in Low-Slope Roofing: A New Design Requirement. This calculator allows the roofing practitioner to determine if a roofing system design requires a vapor retarder or if the system can be modified to enhance its tolerance for small leaks. To use the calculator, simply supply the following information and click on the "Check Roof" button at the bottom of the form.
Insulation Type and Thickness (in inches):
Layer 1
Layer 2
Layer 3

Membrane Solar Reflectance:

Deck Type:

Indoor Temperature (F) and
Relative Humidity (%):

First Three Digits of ZIP Code for Location:

Revised: May 26, 2004 by Juanita Denton