Treatability of western softwood and red alder shakes

The potential to develop durable shakes from several western tree species, other than western redcedar, is being explored. Results of trials with, several different waterborne and oilborne preservatives are discussed in this paper. Penetration of preservative through the entire thickness of shakes was achieved with a variety of waterborne and oilborne systems, but the distribution of the preservatives within the shakes was influenced by preservative formulation and concentration and by treating cycles. For active ingredients used in both waterborne and oilborne formulations, more uniform patterns of preservative distribution generally occurred with the oilborne formulation. With preservatives applied only as waterborne systems, uniformity of distribution was sometimes enhanced by increasing concentrations of the treating solution. With alkaline waterborne systems, uniformity was further enhanced with a stepwise application of pressure and a lengthy pressure period.

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