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To keep the trusses dry. All other benefits are a bonus.

13.) Why are covered bridges covered?

To keep the trusses dry. Timothy Palmer, b. 1751, d. 1821 believed to be the first American bridge builder to advocate roofing bridges, estimating that the life of a wooden bridge would be extended by as much as forty years.
Spanning Time: Appendix D; The Bridge Builders, Page 259; Timothy Palmer

Joe Nelson, P.O Box 267, Jericho, VT 05465-0267,

Content © Copyright 1997 Joseph C. Nelson
This file updated 12-26-99