WUFI

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Bio-hygrothermal Modeling
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Contents Microbial Growth in Building
Practice Microbial Growth Conditions Steady State
and Dynamic Model Practical Application Conclusion
s
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Mold on a thermal bridge (concrete header joist)
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Mold at corners and edges
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Mold behind interior insulation slabs (EPS)
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Microbial growth on a stucco facade
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Microbial growth on a retrofitted (insulated)
external wall
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Temperature range and optimum for the growth of
different mold species
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Growth Rate µm/h
Relative Humidity
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Aspergillus restrictus (Smith)
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Aspergillus restrictus and other species
Lowest Isopleth for MouldDifferent Species
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Relative Humidity
Temperature C
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IBP mold growth test set-up Observation of the
growth of a typical mold cocktail on different
building materials
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IBP mold growth test set-up Results
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Substrate GroupsII non biodegradable building
materialsI biodegradable building
materials 0 optimum substrate
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Comparison of LIM with published data
IEA-Annex 14 German Standard DIN 4108 80
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Substrate Group I
Substrate Group II
Germination time d
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Fungal Growth mm
Relative Humidity
Validity of steady state model questionable for
transient conditions
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Dynamic model for transient conditions spore
behaves like dead organic mate-rial before fungal
metabolism starts
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Water retention curve
Spore wall permeance
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Determination of critical spore water content for
germination
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Implicit assumptions of dynamic growth
(bio-hygrothermal) model
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Experimental verification of dynamic model
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Mold growth due to summer condensation
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No fungal growth detectable on polyamide-film
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Readings from field test
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WUFI simulation
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WUFI simulation results at the monitor position
behind the vapour retarder
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WUFI simulation results at the monitor position
behind the vapour retarder
Kraft paper Polyamide-film
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Critical water content
non biodegradable substrate
biodegradable substrate
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Fungal growth on ETICS applied to a concrete wall
Mold formation several months after
construction At window heads At joints of
insulation slabs
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Monitor positions for WUFI simulations ? Window
head (MW insulation) ? Joints of
insulation slabs (EPS) ? Undisturbed wall
section (EPS)
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First Year
Water content vol-
- critical water content vol-
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Second Year
Water content vol-
critical water content undist. wall
section insulation slab joint window head (MW)
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8th Year
Water content vol-
critical water content undist. wall
section insulation slab joint window head (MW)
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For more information www.building-physics.com
Diss Sedlbauer
Biohygrothermal model WUFI-Bio (only in German)