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Abstract
Interstitial water is the cancer of any flat roof. Once inside a roof assembly, water can cause long-term deterioration and roof failure. In the Scandanivian countries, the required heavy thermal insulation is often blamed to be the cause due to increasing condensation. However, with due consideration, one must realize that the thickness of the insulation only plays a minor role. The critical temperature for moisture condensation in a roof assembly is just below the roofing, and it depends only slightly on the R-value of the insulation and will be close to the ambient temperature for even moderate insulation thicknesses. The main cause for the deterioration of flat roofs is moisture entering the roof assembly. This can take place in varoius ways.
Interstitial water is the cancer of any flat roof. Once inside a roof assembly, water can cause long-term deterioration and roof failure. In the Scandanivian countries, the required heavy thermal insulation is often blamed to be the cause due to increasing condensation. However, with due consideration, one must realize that the thickness of the insulation only plays a minor role. The critical temperature for moisture condensation in a roof assembly is just below the roofing, and it depends only slightly on the R-value of the insulation and will be close to the ambient temperature for even moderate insulation thicknesses. The main cause for the deterioration of flat roofs is moisture entering the roof assembly. This can take place in varoius ways.
Date
0/1989
0/1989
Author(s)
Vagn Korsgaard; Pedersen Rode; Carsten
Vagn Korsgaard; Pedersen Rode; Carsten
Page(s)
67-76
67-76
Keyword(s)
moisture content; Scandanivia; heavily insulated; flat roofs; ambient temperature; R-value
moisture content; Scandanivia; heavily insulated; flat roofs; ambient temperature; R-value