Abstract
There have been recent reports of interstitial condensation forming on the back of vapour checks of dry lined solid walls. This usually occurred within south facing walls during hot weather. A possible explanation is that water evaporates from the inside surface of the masonry, travels through the insulation and condenses on the cooler internal vapour check. Similar condensation has been reproduced in experimental walls under natural weather conditions with a variety of insulants including highly permeable mineral fibre. In these tests it was found that condensation deposited over a period of a few hours can take several days to re-evaporate.
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References
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Christensen, G.
, Summer Condensation in Post Insulated Exterior Walls . Paper presented at meeting of Conseil International du Bátiment CIB/W40 Holzkirchen (Sept 1985 ).
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2 Anderson, N. E., Summer Condensation—a risk when adding interior insulation to existing outer walls. Statens Byggeforskingsinstitut SBI—Report 171.
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