moisture risk assessment using wufi in retrofit and new build · bs en 13788 3. dynamic heat and...
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#UKPHC19
Moisture Risk Assessment using Wufi in Retrofit and New Build
Toby Cambray, Greengauge
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• Mould
• Timber Decay
• Corrosion
• Efflorescence
• Spalling
• …
Why Do We assess moisture risk?
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1. Standard Details and Principles-based design
BS 5250
2. The Glaser Method
BS EN 13788
3. Dynamic Heat and Moisture Transport
BS EN 15026
How Do We assess moisture risk?
Can moisture get out faster than it gets in?
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The Glaser method and its limitations
• Moisture ingress (rain, rising damp)
• Airflow from the interior (i.e. imperfect airtightness)
• Variation of material properties with moisture content
• Liquid moisture transport by capillary suction
• Hygroscopic adsorption and storage
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Storage and Transport of Moisture
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Example: Retrofit IWI
Vapour Diffusion
Air Leaks
Interstitial Condensation?
EvaporationRain Ingress
Capillary Suction
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Setting up the simulation
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Moisture Flux into and out of a piece of insulation at the ‘critical interface’
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Results and Analysis
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Example: New Build
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Outputs
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Refinement and conclusions
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Thank you…
#UKPHC19