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Home T-borpt


A non-arsenical  pressure treatment for sill plate, plywood and other wood framing materials used in above ground areas continuously protected from exposure to liquid water.

T-BOR PT is a borate (DOT) based waterborne wood preservative. Borates are listed in the AWPA P5 Standards as Inorganic Boron (SBX). It provides permanent protection against Formosan and other termite species, decay fungi and wood destroying insects in dry interior applications.

Species and Products

Borates are used as a pressure treatment to preserve the following species per AWPA Standards:

•    Lumber (without incising): Southern pine & ponderosa pine.

•    Lumber (with incising): Coastal Douglas fir, hem-fir and western SPF.

•    Plywood: Southern pine and Douglas fir.

Lumber and plywood must be protected from exposure to the weather while in transit and while being stored at retail yards and job sites. Always store borate-treated wood off the ground and covered.

Retention Levels

Borate treated wood products can only be used for above ground interior or weather protected exterior applications. There are two retention levels. Each level is measured on the basis of either the boric oxide or disodium octaborate tetrahydrate (DOT).

•    0.17 pcf (B2O3)/0.25 pcf (DOT)

•    0.28 pcf (B2O3)/0.42 pcf (DOT) *

* This higher retention is effective against the Formosan termite (Coptotermes formosanus).


Wood, treated with the T-BOR PT DOT type of borate, has been found to be no more corrosive than traditional CCA-treated wood. Code-compliant hardware is adequate. While galvanized fasteners and connectors are mandated, the use of non-galvanized hardware of sizes and types approved by the model code is acceptable when attaching joists, studs, or other framing to T-BOR PT wood, provided the wood will remain dry in service, and is protected from weather and water. Under similar conditions, the use of standard galvanized strapping or mild steel anchor bolts 1/2” in diameter and larger is also acceptable for fastening wood to foundations.