Abstract
Dampness is a common condition in old buildings and, accordingly, many paint systems specific for this type of building allow for application on walls with nonnegligible moisture content. In spite of that, performance evaluation of these paints is normally carried out using dry substrates or even on free paint films. This article presents research performed on 16 commercial paint systems: seven silicate, three silicone, three hydro-pliolite and two lime-based systems, as well as one common vinyl emulsion paint that served as reference. Each paint was applied and cured both on dry and on damp mortar substrates. The test specimens were subjected to water vapor permeability tests and evaporative drying tests. The following conclusions could be drawn: (i) the way paint systems influence the drying of the substrate, to which they were applied and where they cured, may vary significantly depending on the moisture content of that substrate; (ii) vapor permeability, measured with specimens applied and cured on dry substrate, may be an acceptable way of predicting a paint’s influence on drying, provided that the paints are applied and cured on dry substrate or that their characteristics are not significantly affected by the moisture content of that substrate.
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Acknowledgments
We are extremely thankful to Elena Charola and José Delgado Rodrigues for discussing the manuscript of the article. We would also like to thank the nine companies that supplied the paint systems used in this research. Finally, we acknowledge and thank the help, in carrying out the experimental work, of LNEC technicians José Costa, João Júnior and João Ribeiro.
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Brito, V., Gonçalves, T.D. & Faria, P. Coatings applied on damp building substrates: performance and influence on moisture transport. J Coat Technol Res 8, 513–525 (2011). https://doi.org/10.1007/s11998-010-9319-5
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DOI: https://doi.org/10.1007/s11998-010-9319-5