Treatability of Several Northeastern Species with Chromated Copper Arsenate Wood Preservative

This paper discusses the treatability of several northeastern species and the effects of incising upon treatability, as determined by preservative penetration and gain-in-weight retention. Eight-foot-long red pine, eastern white pine, eastern hemlock, gypsy moth-killed eastern hemlock, Norway spruce, European larch, and bigtooth aspen 2 by 4’s and 4 by 4’s were kiln-dried to below 15 percent moisture content as end-matched 4-foot pairs, and then one of each pair was incised. All specimens were then treated with CCA-C via full-cell impregnation. The average unincised and incised, respectively, solution retention levels for the 2 by 4’s were 41 and 42 pounds per cubic foot (pcf) for red pine; 41 and 41 pcf for eastern white pine; and 20 and 32 for bigtooth aspen. More significant retention gains due to incising were found in eastern hemlock (32 and 36 pcf), Norway spruce (25 and 31 pcf), and European larch (12 and 16 pcf). Sapwood penetration in each species was good, and significant heartwood penetration was found in eastern white pine.

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