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1.IntroductionrnHeat,air and moisture transport across a building envelope are inseparable phenomena.Each influences the others and is influenced by all the mat
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McMaster University, Hamilton, Ontario L8S 4L8, Canada
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1.IntroductionrnHeat,air and moisture transport across a building envelope are inseparable phenomena.Each influences the others and is influenced by all the materials contained within the building envelope.rnOften we simplify the process of architectural design by relating control of each phenomenon to a particular material.The thermal insulation,for example,is perceived to control heat transfer and the air barrier to control air leakage.Likewise,the rain screen and the vapor barrier eliminate ingress of moisture to materials.However,these materials perform many different and interrelated functions,and frequently participate as one of several factors in overall system performance.For instance,while controlling air leakage,the air barrier system may also provide effective moisture control.Similarly,by increasing temperature in the wall cavity,thermal insulating sheathing may also reduce the degree of condensation in the cavity.
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