Premature adhesion failure of exterior wood coatings – The influence of substrate temperature at coating application and moisture accumulation during storage

IRG/WP 22-40937

U Hundhausen

The present study aimed at extending the knowledge about premature coating failures of industrially finished wood cladding. Two potential factors were studied: the influence of substrate temperature at coating application and moisture accumulation during storage on the adhesion of waterborne coating systems. In the first experiment, 4 batches of wood specimens were submitted to 4 different temperatures (-25°C, 0°C, 10°C, 20°C) before coating. In the second experiment, coated wood specimens were divided into two batches. One batch was conditioned to 12% moisture content, the other one to 27%. Both batches were then exposed to IR- and UV-radaition in a chamber, simulating intense solar radiation causing intense warming of the cladding boards after being installed on a façade. None of the two studied factors were found to affect coating adhesion. The results suggest that the risk of adhesion defects due to sub-zero substrate temperatures and moisture accumulation during storage is low and that other parameters, especially drying conditions, are of significantly greater importance in quality control of industrially finished cladding.


Keywords: adhesion, building failures, industrial coating application, maintenance, quality control, service life

Conference: 22-05-29/06-02 Bled, Slovenia


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