Chemical Penetration
Penetration varies according to species. In FRT wood it is necessary to have adequate surface penetration to insure proper fire performance. Penetration minimums are prescribed by Underwriters Laboratories for each species they have tested. Incising of difficult-to-penetrate species of lumber prior to treatment may be common practice in some locations.
Treatment Leachability
Dricon® FRT wood is designed for above-ground applications, shielded from precipitation and direct wetting. In such locations, where the chemicals will not leach, the fire retardant chemicals are stable and will remain effective for the life of the structure.Testing has demonstrated that short term exposure to the elements during construction will not adversely affect the fire retardant performance of Dricon FRT wood. However, all unnecessary exposure should be avoided. FRT wood on the job site should be stored off the ground and protected from the weather. Dricon FRT wood is suitable for use as plate stock.
