What Is Tim-bor?


Tim-bor is a brand of borate-based penetrating wood treatment that kills wood-boring insects and wood-destroying fungi. Produced by Tennessee-based Nisus Corporation, Tim-bor is a slow-acting stomach poison for termites, carpenter ants and other wood-boring insects, and a fast-acting contact poison for decay fungi. The active ingredient, Disodium Octaborate Tetrahydrate, is derived from boron-rich mineral deposits. This active ingredient works by preventing insects and fungi from absorbing nutrients, thereby starving them to death.

Applying Product

  • Tim-bor comes in powder form. The powder is dissolved in water and sprayed on wooden sill plates, joists and other interior wooden framing of buildings. It's applied as a 10 percent solution made by mixing 5 pounds of Tim-bor powder with five gallons of water. Spray, let dry, and spray a second coat. Apply each coat at a rate of 5 gallons per 1,000 square feet of wood surface. Tim-bor is colorless, odorless, and won’t corrode nails and other metal structural fasteners. Because Tim-bor can leach out of wet wood, it is limited to above-ground application in dry locations protected from the weather.

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