#UKPHC19

Moisture Risk Assessment using Wufi in Retrofit and New Build

Toby Cambray, Greengauge

• Mould

• Timber Decay

• Corrosion

• Efflorescence

• Spalling

• …

Why Do We assess moisture risk?

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?

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

Storage and Transport of Moisture

Example: Retrofit IWI

Vapour Diffusion

Air Leaks

Interstitial Condensation?

EvaporationRain Ingress

Capillary Suction

Setting up the simulation

Moisture Flux into and out of a piece of insulation at the ‘critical interface’

Results and Analysis

Example: New Build

Outputs

Refinement and conclusions

Thank you…

#UKPHC19