Treesearch

Continued by Techncial note 218. https://www.fpl.fs.usda.gov/documnts/fpltn/fpltn-218-1953.pdf

Many serious losses from decay in wooden structures are due to the fact that the timbers used were infected with wood-destroying fungi while in storage. These losses can be greatly reduced by keeping lumber storage yards in a sanitary condition. Some hints as to how to do this are given below.

An American wood. Description of the distribution, growth, habit, wood, and wood properties of the species. Includes bibliographical references.

Copper-based biocides are widely used to protect wood from biological attack in a variety of environments. Chromated copper arsenate (CCA) is the dominant copper-based preservative for wood protection (J. T. MICKLEWRIGHT, 1989). First developed in India in the 1930s, CCA contains a very effective combination of materials. Copper provides protection against most organisms, chromium aids in the fixation of copper and arsenic to the wood, and arsenic provides supplemental protection against those organisms that are copper tolerant (W. H. HARTFORD, 1973). CCA provides excellent protection in...

The Little Salmon Creek bridge was constructed in November 1988 on the Allegheny National Forest in Pennsylvania. The bridge is a simple span, single-lane, stress-laminated deck superstructure that is approximately 26-ft long and 16-ft wide. The bridge is unique in that it is the first known stress-laminated timber bridge to be constructed of hardwood lumber. The performance of the bridge was monitored continuously for approximately 4 years, beginning at the time of installation. Performance monitoring involved gathering and evaluating data relative to the moisture content of the wood...

Forest Service, Bureau of Land Management, and industry partners are cooperating in a study of the leaching and environmental effects of a wetland boardwalk. The construction project is considered bworst casec because the site has high rainfall and large volumes of treated wood were used. Separate boardwalk test sections were constructed using untreated wood or wood treated with ammoniacal copper quat Type B (ACQ1B), ammoniacal copper zinc arsenate (ACZA), chromated copper arsenate Type C (CCA1C), or copper dimethyldithiocarbamate (CDDC). Part I of this report focuses on leaching of...

The Pueblo County 204B bridge was constructed in March 1990 in Pueblo, Colorado, as a demonstration bridge under the USDA Forest Service Timber Bridge Initiative. The stress-laminated deck superstructure is approximately 10 m long, 9 m wide, and 406 mm deep, with a skew of 10 degrees. Performance monitoring was conducted for 3 years, beginning at installation, and involved gathering data on the moisture content of the wood deck, the force level of the stressing bars, the behavior of the bridge under static load conditions, and the overall condition of the structure. In addition, long-term...

For maximum protection against wood decay and termites, use posts that have an in-depth preservative treatment, preferably a pressure treatment for below ground use. When selecting posts of naturally decay-resistant woods, choose posts with mostly heartwood. Horizontal rails require more protection from decay than do vertical boards. In regions of high and moderate decay hazard, build rails with naturally decay-resistant wood or with pressure-treated wood . Boards, pickets and other face parts should be of decay-resistant wood (either natural or treated) in areas where high decay is...

The primary benefit of this research was to lay a foundation for examining and predicting future participation in recreation on a specific national forest. We explain some of the obstacles involved in site-specific projections and note that this is an area in need of additional research.This study used data from the 1990 U.S. Census to examine changes in the human population surrounding the Chequamegon and Nicolet National Forests in Wisconsin. A methodology was then developed to project future participation in recreation on those national forests based solely on demographics. This...