Ventilated wooden roofs: Influence of local weather conditions-measurements

Abstract

This study investigates the influence of temperature and air velocity conditions on ventilation and condensation in spring, summer and autumn periods inside a ventilated cavity in a full-scale wooden roof construction. The roof has 81 thermocouples, four air velocity measurement devices, and a weather station to record temperature and wind velocity. The temperature measurements show large periods of below-ambient temperature, especially during the spring and autumn. A strong correlation exists between the wind speed and air velocity inside the air cavity. Eave-to-eave ventilation was found to be effective, even with a roof angle of 40°.