Preservative treatment of Scots pine and Norway spruce

The ability to treat Scots pine (Pinus sylvestris) and Norway spruce (Picea abies) with oilborne copper-8-quinolinolate or with waterborne chromated copper arsenate, ammoniacal copper zinc arsenate, or ammoniacal copper quaternary was assessed using commercial treatment facilities in the Pacific Northwest. In general, Scots pine was more easily treated than was Norway spruce, although neither species could be treated to the standards of the American Wood-Preservers’ Association for dimension lumber without incising. Treatment was better with ammonia-based solutions, reflecting the ability of these systems to overcome the effects of pit aspiration and encrustation, and their ability to swell the wood to improve permeability. The results indicate that successful treatment of both species will require the use of incising. In addition, further research will be required to identify suitable schedules for successfully treating Norway spruce with oilborne copper-8-quinolinolate.

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