FIELD-MEASUREMENTS OF VENTILATION RATES IN ATTICS

Field tests were carried out in residential attics at a dedicated test site over a two year period. The scope of this paper is to present me asurements of ventilation rates, indoor-attic exchange rates, temperat ures and wood moisture contents at various locations in the attics. At tic ventilation rates are correlated with wind speed, wind direction, and attic-outdoor temperature difference. Wind speed is shown to be th e dominant driving force for ventilation; however, wind direction is i mportant particularly when the attic is sheltered.