. Protecting and enhancing America's forests and rangelands : 1986 research accomplishments. Forests and forestry United States; Rangelands United States. Fumigants Control Decay in Timber Exterior structural timbers can be serviceable for decades with proper care and maintenance. These timbers are usually pressure treated, but deep seasoning checks that penetrate the treated shell can develop. The result is interior decay and premature replacement of timbers at inflationary costs. Preservatives applied by ordinary flooding from a brush or spray penetrate the wood only slightly and so cannot s
. Protecting and enhancing America's forests and rangelands : 1986 research accomplishments. Forests and forestry United States; Rangelands United States. Fumigants Control Decay in Timber Exterior structural timbers can be serviceable for decades with proper care and maintenance. These timbers are usually pressure treated, but deep seasoning checks that penetrate the treated shell can develop. The result is interior decay and premature replacement of timbers at inflationary costs. Preservatives applied by ordinary flooding from a brush or spray penetrate the wood only slightly and so cannot stop this decay. Researchers at the Forest Products Laboratory, in cooperation with the Naval Facilities Engineering Command, have shown that fumigants such as Vapam and chloropicrin, applied to holes drilled in the timbers (for example, curbing) and plugged, can eradicate important fungi that decay wood products. The study also determined the extent and speed of penetration of toxic amounts of fumigants through horizontally oriented timbers as well as the longevity of toxic. concentrations of fumes in timbers. Effectiveness of treatments varies, depending on fumigant used and timber species. The cost to replace decayed timbers has increased out of all proportion to the cost of the raw material. Furthermore, timber has been estimated to increase in value nearly 24 times between the stump and delivery of the finished product. Application of these research findings has potential for high financial return by extending the service life of structures and avoiding costly repairs. In this schematic diagram, although conventional wood preservatives have penetrated part way into this railroad tie, drying checks have opened up the inner core—past the treated zone--so decay- causing organisms can find their way in. A new fumigation treatment developed at the Forest Products Laboratory will protect wood even in the face of such deep seasoning checks. 52. Please note that these images
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