2.2 Coatings for Mass Timber Products
(Room 240-242)
09 Apr 18
2:30 PM
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3:00 PM
Tracks:
Session 2: Wood Coatings
Recently many innovate architects and green building engineers are using mass timber products mainly cross-laminated timber (CLT) to build multi-story wooden buildings. They are attractive and beautiful at first, but wood scientists are concerned how these buildings perform and look after a few years of natural weathering exposure. This study was designed to evaluate and test performance of a wide range of coatings available in North American market to screen and select best coatings for long-term weathering studies at two different sites. More than 35 different coatings (transparent and semi-transparent stains and paints) were purchased and analyzed in the lab by measuring their properties such as: solid content, pH, viscosity (Rheometer), glass transition temperature (Tg) using differential scanning calorimeter, surface tension (Tensiometer) and their dynamic contact angles on wood. In addition, moisture excluding efficacy and water vapor permeability of these coating on CLT samples were tested in the lab. Then, a chemometric model (PLSR) was developed to find correlations between coating properties and their performance in the lab to select the top best coatings for exterior application on mass timber.