Improved preservative treatment of spruce-pine-fir at higher moisture contents

The work described here was part of a project to develop effective pretreatment procedures and pressure treatment processes for spruce-pine-fir. This experiment compared the treatability of spruce, pine, and alpine fir subjected to two different planing, incising, and drying procedures. For all three species, the material that was planed-green, double-density green-incised, and then dried to 30 percent moisture content (MC) showed significantly better preservative penetration than the material that was first kiln-dried to 16 percent MC, planed, and then incised. The green-incised material also had a much better surface appearance. Both “charges” of alpine fir treated at 16 and 30 percent MC met American Wood Preservers’ Association and Canadian Standards Association preservative penetration requirements. Spruce and lodgepole pine met the penetration requirements in both charges only when treated at 30 percent MC.

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