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Factors Affecting Distribution of Borate to Protect Building Envelope Components from Biodegradation

https://research.thinkwood.com/en/permalink/catalogue1586
Year of Publication
2012
Topic
Moisture
Serviceability
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Saadat, Nazmus
Cooper, Paul
Organization
University of Toronto
Year of Publication
2012
Format
Thesis
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Moisture
Serviceability
Keywords
Preservatives
Borate
Building Envelope
Moisture Content
Spruce
Douglas-Fir
Research Status
Complete
Summary
Borate can be a potential candidate to protect building envelope components from biodegradation as it has low toxicity and can penetrate wood without pressure treatment, even in the refractory species commonly used in construction industries as structural components. In this research, wood moisture content, grain direction, formulation and species that affect the diffusion of borate in refractory species were investigated. Two highly concentrated formulations were applied and a novel approach (borate bandage) was used to keep the preservative on the surface and enhance the diffusion by reducing surface drying. From ANOVA test for different diffusion periods and depths of penetration, it was found that grain directions and moisture content are significant factors. A mould test was performed, the diffusion co-efficients were calculated and some recommendations were made about the quantity required to protect a specific volume of wood considering the distance moved by diffusion and volume treated in different directions.
Online Access
Free
Resource Link
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