Technical Report

 

Seasoning and preservative treatment of tanoak lumber Public Deposited

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https://ir.library.oregonstate.edu/concern/technical_reports/028711832

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  • Tanoak lumber might supplement the supply of white oak for boat construction, as the tree has extremely thick sapwood that can be pressure- treated readily with preservatives. One-inch tanoak lumber was kiln -dried to 3 different moisture content ranges, then pressure -treated with water -borne preservatives. Some unseasoned lumber was steamed prior to treatment. After treatment, lumber was air -dried, then kiln- dried. Tanoak sapwood was penetrated readily with water -borne preservatives over a wide moisture content range, but drying to a moisture content of less than 40 per cent was necessary to obtain retentions of 20 pounds or more per cubic foot. Dark-colored heartwood was very resistant to treatment; penetration was not improved by increasing either pressure or pressing time. Heartwood also was more prone to check and collapse during drying than was sapwood. A high percentage of the treated sapwood lumber did not develop surface checks during drying, but much of the lumber did develop some form of warp. Selection of freshly cut tanoak sapwood would be desirable both for treating and for drying. Such separation appears possible because of the exceptionally high percentage of sapwood in this species. Since contrast between sapwood and heartwood decreases as the wood dries, early separation is necessary.
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