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Exterior Wall Moisture and Heat Transfer Analysis Tool
(for Residential Buildings)

Current Version: MOIST 4.03

MOIST 4.03 predicts heat and moisture performance for a single exterior wall of any construction. It is an updated version of MOIST 3.0 that was developed at the National Institute of Standards and Technology (NIST) and is based on one-dimensional heat and moisture transfer. The user can specify a wall construction and orientation, a location, and an indoor condition. The program uses hourly weather data for ambient temperature, humidity, wind speed and direction, and solar radiation to estimate time and spatial variations in wall material temperature and moisture content. In particular, the program is useful in identifying situations that can lead to mold problems.

Download MOIST 4.03