Ventilation with outdoor air has been the accepted method for controlling moisture and overheating in residential attics. This is recognized in the Building Code which requires that the total vent area must be l/300th of the attic floor area. However, how much ventilation is provided and how this ventilation affects moisture accumulation in an attic are not well understood. The present study attempts to provide some answers to these questions. The study consists of two parts. First, detailed measurements were carried out in two separate attics located at a field test site.
The ventilation heat loss has been assesed for twelve factory/warehouse buildings covering a range of construction types. This has been achieved by the design and development of a new mobile test facility which can pressurise buildings up to and beyond 20,000 m3, depending on their air leakage characteristics. The results of the measured air leakage characteristics have been translated into predicted air change rates for mean wind speeds and average internal/external temperature differences, from which the average ventilation heat loss has been calculated.
Air Infiltration in Norwegian buildings has been an unknown parameter. This paper is based on results from measurements in nine different buildings in Norway.
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