For a properly ventilated space and/or with a working dehumidification system, wood in enclosed spaces with full roof cover need not be preservatively treated.

Sentinel Structures, Inc. "Ventures in Wood", in words and pictures illustrate -
  1. When wood need not be preservatively treated
  2. When it must be preservatively treated
  3. When treatment is needed, or is not required, dependent upon construction details

You may find Pressure Preservative Treatment of Structural Glued Laminated Timber at the National Maritime Museum Association, address http://www.maritime.org/conf-rhude.htm.

For further information, reference the American Institute of Timber Construction (AITC) Standard 109 or the McGraw-Hill Standard Handbook for Civil Engineers, Fourth Edition, Section 11 "Wood Design and Construction".



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