MOIST: A PC Program for Predicting Heat and Moisture Transfer in Building Envelopes. Version 3.0.
MOIST: A PC Program for Predicting Heat and Moisture
Transfer in Building Envelopes. Version 3.0.
Burch, D. M.; Chi, J.
NIST SP 917; 47 p. September 1997.
building technology; computer programs; heat transfer;
moisture control; moisture transfer; moisture analysis;
wall performance; windows
This report is a User's Manual for a computer program
called MOIST (Release 3.0). MOIST is a user-friendly
personal computer program that predicts the
one-dimensional transfer of heat and moisture in
building envelopes. With MOIST, you will be able to
easily define a wall, cathedral ceiling, or low-sloped
roof construction. You will subsequently be able to
predict the temperature and moisture content (or
relative humidity) of the individual construction layers
as a function of time of year. In addition, you will be
able to investigate the effects of various parameters on
the moisture accumulation within layers of the
construction. For example, you will be able to conduct
computer runs for different U.S. and Canadian cities,
thereby investigating the effect of climate on moisture
accumulation. You will be able to determine if a vapor
retarder is needed, and if needed, where it should be
placed relative to the other materials. MOIST allows
the user to vary the building materials and their
relative placement and analyze the effect of the
water-vapor resistance offered by paint layers,
wallpapers, and vapor retarders.