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Sometimes, field cuts of treated wood are required. With some wood species, these cuts expose untreated wood that is subject to attack by decay fungi, unless preservatives are applied to those surfaces. The objectives of this research were to determine at time of injection and 8 weeks after injection (1) the distribution patterns of water and several preservative solutions around points of injection in several wood species and (2) the influence of glycol on the initial distribution of injected borate solutions. Solid members of northern red oak, eastern cottonwood, Southern Pine, and laminated beams of red maple or Douglas-fir were used in this investigation. The Southern Pine members were predominantly sapwood; Douglas-fir and red oak were predominantly heartwood. The other two were mill run materials. Wood moisture content at time of treatment was below the fiber saturation point. The distribution of preservative about the injection point was observed in 10 replicate units of each wood species. Results showed that the relative amount of borate that can be introduced by either pressure injection of solutions into localized depots is species dependent. We observed equivalency in loadings between pressure injection and insertion of fused borate rods for cottonwood and red maple, but a reduced loading potential for pressure-injected solutions in Douglas-fir and Southern Pine. The distribution pattern of injected borates, within 8 weeks of injection, was more influenced by wood species than by solution formulation (i.e., water or glycol), volume injected, or injection pressure. At comparable injection pressures, longitudinal penetration and injection volume were greatest in red oak. followed by cottonwood, red maple, Southern Pine, and Douglas-fir.

Distribution of Borates Around Point Source Injections in Dry Wood Members