We have built an outdoor test facility to continuously monitor full-scale commercial and residential roof specimens (for temperature, relative humidity and heat flux) to investigate the complex issues related to the formation and removal of interstitial moisture in roof spaces.
A main focus is the role of ventilation on the dynamics of interstitial moisture in roof spaces:
This experimental work will be supplemented by field ventilation surveys in residential and commercial environments. These will give a snapshot of the level of ventilation currently present and provide essential information for the test facility and the subsequent modelling effort.
Recent results on commercial roof structures - characterised by a large cavity often with steel framing - are summarised in a study report and will be presented at the BABNZ conference in September 2014.
Present work is focusing on moisture and ventilation in skillion-type residential roofs.