SR180 Air flow rates field measurements (2007)

Ventilation plays a key role in the process of moisture formation and removal in roof envelopes. In order to investigate patterns and magnitude of air flows affecting the behaviour of roofs (with a special focus on building underlays), a field device has been designed and developed. This apparatus provides all the data needed to estimate air flow rates, and it is based on an implementation of the constant concentration multi-tracer gas method.

The apparatus was used for a campaign of field measurements in private residential dwellings. Several typologies of measurements are presented:

• Measurements of air flow rates between roof space and living space.
• Measurements of air flows between roof space and cavity underlay-cladding.
• Measurements of air flow direction inside the cavity underlay-cladding.