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Performance Criteria for Natural-Looking Coatings on Mass Timber Products Using Exterior Applications

https://research.thinkwood.com/en/permalink/catalogue722
Topic
Serviceability
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Nejad, Mojgan
Stokes, C. Elizabeth
Ohno, Katie
Organization
Forest Products Laboratory
Format
Report
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Serviceability
Keywords
Coatings
Long-term
Outdoor Exposure
Research Status
In Progress
Summary
Newly constructed wood buildings are visually appealing but can eventually lose their beauty without proper protection. To preserve the natural beauty of wood products exposed to outdoor conditions, protective coatings should be applied to reduce the effect of weathering degradation of wood. Currently, no published work defines criteria for choosing the best coatings for mass timber products. It is vital to provide comprehensive guidelines for protecting and maintaining the appearance and increasing the durability of mass timber products. The objective of this research is to promote the application of mass timber products, especially CLT, by identifying a range of suitable coatings that can prolong performance and the natural appearance of these products used in the construction of tall buildings.
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Physical, Optical, and Visual Performance of Coated Cross-Laminated Timber during Natural and Artificial Weathering

https://research.thinkwood.com/en/permalink/catalogue2983
Year of Publication
2021
Topic
General Information
Material
CLT (Cross-Laminated Timber)
Author
Bobadilha, Gabrielly
Stokes, C. Elizabeth
Ohno, Katie
Kirker, Grant
Lopes, Dercilio
Nejad, Mojgan
Organization
Mississippi State University
Forest Products Laboratory
Michigan State University
Editor
Sandak, Anna
Publisher
MDPI
Year of Publication
2021
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
General Information
Keywords
Surface Protection
Outdoor Exposure
Artificial Weathering
Wood Degradation
Research Status
Complete
Series
Coatings
Summary
Cross-laminated timber (CLT) market demand is on the rise in the United States. Adequate protective measures have not been extensively studied. The objective of this study was to investigate the weathering performance of exterior wood coatings. We evaluated coated CLT sample surfaces based on visual appearance, color change (CIE*L*a*b), gloss changes, and water intrusion. From the five exterior wood coatings evaluated, only two showed adequate performance after twelve months field exposure. Based on visual ratings following the ASTM procedures, coating failure occurs more quickly in Mississippi than in Wisconsin, due to its greater decay zone. Both location and coating type impacted the aging of the samples. Artificial weathering results were consistent with natural weathering indicating the two adequate coatings were the most resistant to failure, color, and gloss change. For future studies, new coatings designed for the protection of end-grain in CLT panels should be a target of research and development.
Online Access
Free
Resource Link
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