What Is Hygrothermal Modeling (WUFI)?
WUFI (the hygrothermal — the heat+moisture; the Fraunhofer's) simulates (the assembly's — the transient; the hourly) the moisture (the condensation's — the drying's; the mold's). The modeling: the climate's (the hourly — the TRY's), the materials' (the functions' — the sorption's), and the criteria (the 80% RH — the mold's; the 1% — the moisture's). The wall's — the virtually tested.
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How WUFI works
The transient (the hourly — the year's; the heat's — the moisture's coupled), the materials (the functions' — the sorption's; the vapor's — the liquid's), the boundary (the interior's — the 70/50; the exterior's — the TRY's), and the outputs (the RH's — the moisture's; the mold's — the index).
The criteria
The 80% (the RH's — the mold's; the 30-day's), the 1% (the moisture's — the increase; the ASHRAE 160's), the corrosion (the 60%'s — the metal's; the sheathing's), and the freeze (the 95%'s — the masonry's; the spalling's).
Applications
The retrofits' (the insulated — the risk's; the modeled), the mass (the masonry's — the drying's; the EIFS'), the roofs' (the unvented — the modeled; the 1.0 perm's), and the litigation (the forensics' — the proven; the expert's). ASHRAE 160 — the standard; the WUFI — the tool.
The bottom line
Model assemblies in WUFI per ASHRAE 160 (hourly climate, material sorption functions) — pass criteria: <80% RH sustained (mold), <1% moisture increase; essential for retrofits and mass walls.
Torch Engineering PLLC · (480) 490-0064 · info@torchengineering.com — PE stamping backed by Apex Grid Engineering.