Fused borate and bifluoride remedial treatments for controlling decay in window millwork

Conventional ponderosa pine window millwork was subjected to basidiomycete decay by inoculation with a brown-rot fungus and sampled for viable fungus before and 8 months after remedial preservative treatment. Treatments applied were fused disodium octaborate rods (IMPEL?) at boric acid retention levels of 1.5 and 4.0 kg/m3 or liquid bifluoride injections (IMPROSOL?) at 1 kg/m3. The elimination of decay fungus after remedial treatment was nearly 100 percent effective in all treated material regardless of remedial treatment used or chemical loadings. By contrast, isolation frequency of decay fungi in the control samples increased from 27 to 69 percent. Color reagent dye tests for diffusion indicated excellent distribution of chemicals in wood material where moisture contents exceeded 25 percent. Substantial savings to the consumer in labor and material costs could be realized when compared to current repair or replacement methods. Research should continue on the use of these treatments in forest products where wood moisture contents may occasionally favor attack by wood decay fungi.

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