A Note of the Positive Effects of Double-Sided Profiling on the Cupping and Checking of ACQ-Treated Douglas Fir, Western Hemlock and White Spruce Deckboards Exposed to Natural Weathering

Heshmati, Sina; Leung, Lukie H.; Mazloomi, Mohammad Sadegh; Kim, Joseph Doh Wook; Evans, Philip D.

doi:10.22382/wfs-2020-022

Cited by 1 publication

(4 citation statements)

References 14 publications

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“…Shelling did not occur at the surface of flat weathered deckboards oriented bark-side-up, although checking was more pronounced at the surface of boards oriented bark-side-up compared to those oriented pith-side-up, Figure 4, in accord with the results of previous studies [5,8]. Many of the checks in boards oriented bark-side-up occurred at the interface of latewood and earlywood (Figure 4), but did not cause growth rings to project from the surface of the wood, as was observed in boards oriented pith-side-up.…”

Section: Shelling Of Growth Rings In Flat Western Larch Deckboardssupporting

confidence: 92%

“…An additional measure that would help reduce shelling of profiled larch deckboards is to use a wavy rather than a rib profile. Profiled deckboards should be profiled on both sides to produce a balanced board that is less susceptible to cupping [8]. A profile on the pith-side of boards that is different to that on the bark-side would make it easier to orient deckboards correctly, although the sub-surface profile would need to be able to achieve its desired aim of reducing cupping.…”

Section: Discussionmentioning

confidence: 99%

“…These boards were part of an experimental trial that examined effects of three factors, profile type, wood species (Douglas fir, western hemlock and white spruce) and growth ring orientation (boards with growth rings oriented either bark-side-up or pith-side-up) on the cupping and checking of deckboards during weathering. The materials and methods that were used to prepare and weather these deckboards are described in detail in a recent publication [8]. Flat weathered deckboards with growth rings oriented pith-side-up were selected, and shelled growth rings were imaged using confocal profilometry and macro-photography, as described above.…”

Section: Measurement and Imaging Of Shelling Of Weathered Deckboardsmentioning

confidence: 99%

“…These boards are commonly known as bark-side-up and pith-side-up boards, respectively [7] (Figure 1). The checking of wood during exposure to the weather is less pronounced in wooden boards that are oriented pith-side-up [5,8].…”

Section: Introductionmentioning

confidence: 99%

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Shelling of Growth Rings at Softwood Surfaces Exposed to Natural Weathering

Leung

Evans

2020

Coatings

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Shelling is the delamination of growth rings and the projection of woody tissue from wood surfaces. Shelling disrupts coatings and makes refinishing difficult, and a better understanding of the phenomenon is needed to help alleviate its unwanted effects. We tested whether confocal profilometry could quantify shelling in flat-faced and profiled-faced western larch deckboards exposed to natural weathering and examined the effects of growth-ring orientation and angle on shelling. Confocal profilometry was able to quantify shelling in both deckboard types. Shelling developed at the surface of flat-faced deckboards oriented pith-side-up, whereas it was absent from boards oriented bark-side-up. We found an inverse correlation between the height of shelled growth rings and the angle of growth rings to the surface of flat-faced boards. Shelling occurred in profiled-faced boards oriented pith-side-up due to the delamination of growth ring tips and projection of latewood from wood surfaces. A superficially similar although less pronounced phenomenon was seen in profiled-faced boards oriented bark-side-up. The shelling of profiled-faced boards oriented pith-side-up created lanceolate-shaped slivers of latewood that projected from the peaks of profiles. Some of these latewood tips were sharp and, for this reason, we suggest that profiled-faced western larch deckboards should always be oriented bark-side-up rather than pith-side-up.

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Section: Shelling Of Growth Rings In Flat Western Larch Deckboardssupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Measurement and Imaging Of Shelling Of Weathered Deckboardsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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