28 March 2005 Thermal patterns on solid masonry and cavity walls as a result of positive and negative building pressures
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Abstract
Air leakage occurs in a variety of different ways through all types of exterior walls. In cold or warm climates, air leakage is accompanied with moisture transport. This moisture transport when migrating through dew point temperatures, leads to moisture accumulation within wall assemblies. This moisture accumulation may result in premature deterioration and mould formation given appropriate prolonged environmental conditions. Commissioning of air barrier assemblies using infrared thermography is an effective means of locating areas of air leakage defects. Since the environmental conditions that commissioning or building condition inspections are carried out vary considerably, the resultant air leakage thermal patterns on wall surfaces vary accordingly. This paper will outline the various types of thermal patterns created by both positive and negative building pressures during exterior inspection of various types of masonry clad buildings. These thermal patterns can be extrapolated to similar naturally occurring air leakage thermal patterns created by wind, stack effect and lack of existing mechanical system pressurization. This paper will outline the variable thermal pattern conditions created by cavity wall construction in addition to homogeneous solid wall construction and face seal type assemblies.
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Antonio Colantonio, Antonio Colantonio, Garry Desroches, Garry Desroches, } "Thermal patterns on solid masonry and cavity walls as a result of positive and negative building pressures", Proc. SPIE 5782, Thermosense XXVII, (28 March 2005); doi: 10.1117/12.606000; https://doi.org/10.1117/12.606000
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