Initial WUFI analyses on these walls indicate that wall systems really do need to be designed for the specific application and location.
The potential for moisture collection and high relative humidity leading to mold growth when a vapor retarder (poly) is placed behind the interior dry-wall is the perfect example of how the WUFI program could have been used to predict a moisture problem.
Nickson delivered a presentation on WUFI technology at the 2005 NAA Capitol Conference in March.
It is also uncertain whether these files even contain all the necessary solar radiation and precipitation data required by WUFI, since those data were not needed by ASHRAE.
1 (METEOTEST 2005) is a software tool that consists of a set of meteorological databases and a series of conversion utilities that prepare and format weather data for use with major modeling software packages including WUFI.
The resulting weather data files are produced in a variety of formats, including the IBP-formatted Test Reference Year (TRY) format that can be directly read by the WUFI program.
Literature published from the ORNL MOISTURE-EXPERT research to date (Karagiozis 2001a, 2001b, 2002, 2003; Karagiozis et al 2001) provides insight into the effect of varying magnitudes of water penetration and drainage, as well as air movement, in stucco-clad wall systems similar to those studied in this paper's WUFI analysis.
Based only on this current WUFI analysis, which was limited to one-dimensional water vapor diffusion between wall components and liquid water transport inside the building materials, and the 10 different wall system simulations in a single target CZ location of Mount Shasta (CZ 16), the greater stucco thickness and its larger water uptake lead to the largest increases in the resulting moisture content and surface relative humidity levels of the OSB.