Banner for LabNotes
From Lab Notes
Contact Information
Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592
Email

 

You are here: FPL Home  / Information Products & Services  / Publications

Requested Product

Title: Guide for In-Place Treatment of Covered and Timber Bridges

Source: Forest Products Laboratory, General Technical Report

Author(s)Lebow, Stan; Kirker, Grant; White, Robert; Amburgey, Terry; Barnes, H. Michael; Sanders, Michael; Morrell, Jeff

Publication Year: 2012  View PDF »

Category: General Technical Reports
Associated Research Project(s):   FPL-4723-3

Abstract: Historic covered bridges and current timber bridges can be vulnerable to damage from biodeterioration or fire. This guide describes procedures for selecting and applying in-place treatments to prevent or arrest these forms of degradation. Vulnerable areas for biodeterioration in covered bridges include members contacting abutments, members near the ends of bridges subject to wetting from splashing and members below windows or other openings that allow entry of wind-blown precipitation. Pressure-treated timber bridge members can be vulnerable when untreated wood is exposed by field fabrication or by the development of drying checks. The objective of an in-place preservative treatment is to distribute preservative into areas of a structure that are vulnerable to moisture accumulation and/or not protected by the original pressure treatment. Types of field treatments range from finishes, to boron rods or pastes, to fumigants. A limitation of in-place treatments is that they cannot be forced deeply into the wood as is done in pressure-treatment processes. However, some can be applied into the center of large members via treatment holes. These preservatives may be available as liquids, rods or pastes. Bridge members can be treated with fire retardants to delay ignition, reduce heat release, and slow the spread of flames. In-place coating products are available to reduce surface flammability, but these coatings may need to be reapplied on a regular basis if exposed to weathering. For more integrated protection, fire retardant treatment of bridge members may be combined with other forms of protection such as lights, alarms, sprinklers and monitoring systems.

Keywords: guide; covered bridge; timber bridge; deterioration; fire; wood preservatives; in-place treatment

Publication Review Process: Informally Refereed (Peer-Reviewed)

File size: 6,823 kb(s)

Date posted: 03/26/2012

This publication is also viewable on Treesearch:  view
RITS Product ID: 41762
Current FPL Scientists associated with this product (listed alphabetically)
Kirker, Grant
Research Forest Products Technologist
Lebow, Stan T.
Research Forest Products Technologist
 

Additional items that might interest you
View the video celebrating FPL's 100 years of public service in 2010, from the producers of the Greatest Good....view

Research Highlights from FPL....view

Termite Eradication: A search for the Holy Grail.... view

Moisture Management in Residential Construction Series videos...view

Wood Floor Systems in Residential Construction Series videos....view
- FPL's Mission and Strategic Plan -

FPL's mission is to identify and conduct innovative wood and fiber utilization research that contributes to conservation and productivity of the forest resource, thereby sustaining forests, the economy, and quality of life. ... ..more »

- FPL Research Emphasis Areas -
Advanced Composites

As an integral part of the FPL mission, we improve the long-term sustainability of our Nation's forests by creating valuable composite products from biobased materials ... ..more »


Advanced Structures

The FPL has been in the forefront of wood-frame housing research since 1910 and has long been recognized as a world leader in such housing-related areas as engineered wood ... ..more »


Forest Biorefinery

We all know the compelling reasons that the United States needs to reduce its dependence on fossil fuels. Historically, the greatest increases in energy demand have been for transportation fuels ... ..more »


Nanotechnology

A leader in wood products research for over a century, the FPL is positioning itself to become the lead Federal research facility for the application of nanotechnology in forest products ... more »


Woody Biomass Utilization

Forests in the United States contain a substantial amount of small-diameter, overstocked, and underutilized material.FPL research projects are exploring the potential of the small-diameter ... ..more »