This part of the WAVE programme tried to understand the complex airflow patterns that can occur in roof spaces and how these can be controlled in such a way that they manage moisture effectively.
Projects in the interstitial moisture stream
We built an outdoor test facility to continuously monitor full-scale commercial and residential roof specimens to investigate the complex issues related to the formation and removal of interstitial moisture in roof spaces.
A main focus was the role of ventilation on the dynamics of interstitial moisture in roof spaces:
- How much roof ventilation is required to prevent moisture problems?
- If extra ventilation is required, what are the best ways to provide it?
This experimental work was supplemented by field ventilation surveys in residential and commercial environments. These gave a snapshot of the level of ventilation currently present and provided essential information for the test facility and the subsequent modelling effort.
In roof spaces - air cavities and the building elements surrounding them - heat transfer, air movements and moisture transport are strongly linked and affect the formation and the removal of condensation.
We aimed to build a comprehensive numerical model of the transport of heat, air and mass in roof spaces to interpret the data collected in the test building and to generalise this to a variety of roof designs and climatic zones. Such a model would allow us to study the performance of different roof designs and ventilation strategies and would be a fundamental tool for generating Verification Methods and design guidelines.
Explore the range of web and print resources related to this stream of the WAVE programme.