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Determining Optimised H3 LOSP Treatment Options for Decay Protection in Softwood Glulam

https://research.thinkwood.com/en/permalink/catalogue1930
Year of Publication
2011
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Cookson, Laurie
Publisher
Forest & Wood Products Australia
Year of Publication
2011
Format
Report
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Mechanical Properties
Keywords
LOSP
CCA
TBTN
Treated Wood
Research Status
Complete
Summary
The objective of this research was to examine the LOSP treatment options available for H3 exposed glulam of Pinus radiata and P. elliottii. Test specimens were treated before or after gluing with azole LOSP, while some were treated with TBTN or CCA for comparison. They were then exposed at Innisfail or in an Accelerated Field Simulator (AFS) designed to give severe exposure and accelerated results. After 3.1–3.2 years, test specimens were given a performance rating from a scale of 8 (sound) to 0 (destroyed by decay). The results suggest that treating glulam before gluing will generally give better performance than treatment after gluing. Decay was more rapid in vertically exposed than horizontally exposed specimens, suggesting that glulam posts need special attention to prevent water penetration. End grain sealants based on copper naphthenate or zinc naphthenate gave improved decay resistance, but on their own were insufficient for post end protection. This suggests that a better approach would be to include barriers (caps) as well, or to use designs where the end is not exposed to rain or can drain away readily.
Online Access
Free
Resource Link
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Performance of Preservative-Treated Glulam After Six Years in an Accelerated Above-Ground Field Test

https://research.thinkwood.com/en/permalink/catalogue360
Year of Publication
2015
Topic
Serviceability
Material
Glulam (Glue-Laminated Timber)
Author
Ingram, Janet
Morris, Paul
Organization
FPInnovations
Year of Publication
2015
Format
Report
Material
Glulam (Glue-Laminated Timber)
Topic
Serviceability
Keywords
Decay
Preservative
Treated Wood
ACQ
CCA
Research Status
Complete
Summary
Glulam manufactured from laminating stock of three species pre-treated with ACQ-D or CA was exposed outdoors in an above-ground field test using a modified post and rail test design. After six years’ exposure, early to moderate decay was found in untreated test units, while those which were preservative-treated were completely sound.
Online Access
Free
Resource Link
Less detail