Genuine Dricon® FRT Wood – Preservative

Preservative Properties

In addition to excellent fire retardant characteristics, Dricon® FRT wood effectively resists attack by termites and decay in above ground, weather-protected use. This includes studs, flooring, joists, trusses, sill plates, interior trim, and other applications not exposed to direct wetting.

Dricon fire retardant chemical is registered for use as a wood preservative with the U.S. Environmental Protection Agency. Some species of Dricon FRT wood also meet the requirements of AWPA Standard U1 Commodity Specifications A (sawn products) and F (plywood), which means that this wood effectively withstands damage from decay and termites.

Recent tests have shown that, at the retention levels present in most species, Dricon FRT wood is protected against damage from even the Formosan termite. Dricon FRT wood, processed to UL’s standards, will meet retention requirements for protection against subterranean and Formosan termites as established by the American Wood Protection Association (0.28 pcf B2O3) standard P5 under Inorganic Boron, SBX.

Termiticidal Efficacy

Mississippi State University Forest Products Laboratory conducted an evaluation of the effectiveness of Dricon FRT wood in preventing termite attack. The standard test procedures defined in American Wood-Preservers’ Association Standard M12-72 were used. Southern pine sample blocks were pressure-treated with four retentions of the Dricon formulation. These treated blocks and untreated control blocks were exposed to locally collected termites (assumed to be Reticulitermes flavipes) in an unweathered and unleached condition.

In this accelerated four-week test, even the blocks treated with substantially lower than normal retentions of Dricon fire retardant chemicals exhibited excellent termite protection. All 20 blocks in this group were rated “light attack” or better at the conclusion of the tests. Samples treated with normal retentions showed even less damage. All untreated control blocks were rated either “failure” or “heavy damage.” More recently, a study performed at the University of Hawaii demonstrated the effectiveness of the Dricon formulation against Formosan termites.

Samples of southern pine, treated with the Dricon solution to various retention levels, were exposed to Coptotermes formosanus in accordance with AWPA test method E1-97. After four weeks of exposure, the samples were evaluated. Samples treated to just 56% of the minimum standard for Dricon FRT wood showed only “light attack” (8.6 average visual rating) and 4.05% average weight loss, compared to “failure” (visual rating of 0.0) and 51.4% weight loss for the untreated controls. Samples with higher retention levels showed even less effect.

Fungicidal Efficacy

The evaluation of fungicidal properties was conducted at the Michigan Technological University according to ASTM D 1413-76 using soil block cultures. Test blocks were prepared from southern pine sapwood and Douglas fir heartwood. Eight replicates of each species were treated with Dricon fire retardant using commercial treating solutions and processing. The treated blocks and untreated control blocks, in an unweathered, unleached condition, were exposed to three fungal organisms (Gloeophyllum trabeum, Lentinus lepideus and Poria placenta) for a 12-week period.

At the conclusion of the test, the blocks were examined. There was no visual evidence of decay in any blocks treated with Dricon fire retardant at normal commercial retention levels. All untreated blocks, regardless of fungus species, showed decay and experienced weight losses ranging from 18.6% to 66.7%.

When steel studs are selected, the use of Dricon FRT underlayment (shown right) and sheathing makes the entire framing package resistant to termites, decay and flame spread.