TT-W-571J, FEDERAL SPECIFICATION: WOOD PRESERVATION: TREATING PRACTICES (31 OCT 1974) [SEE NOTICE 1, AWPA BOOK OF STANDARDS FOR SUPERSEDING DOCUMENTS]

TT-W-571J, FEDERAL SPECIFICATION: WOOD PRESERVATION: TREATING PRACTICES (31 OCT 1974) [SEE NOTICE 1, AWPA BOOK OF STANDARDS FOR SUPERSEDING DOCUMENTS]., This Interim Federal Specification was developed by the U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, P. O. Box 5130, Madison, Wisconsin 53705, based upon currently available technical information. It is recommended that Federal agencies use it in procurement and forward recommendations for changes to the preparing activity at the address shown above. The United States Department of Agriculture has authorized the use of this Interim Federal Specification as a valid exception to Federal Specification TT-W-571i. This specification covers the treatment of different forms and species of wood with various preservatives. It covers treatments of wood items that will be exposed to either moderate or severe hazard of attack by wood destroying organisms so that an appreciable-retention of preservative as well as significant penetration into wood is necessary. Such results are attainable by pressure processes which are acceptable for all products listed in tables I, II, and III. Certain other processes are acceptable for some items provided that they yield the retention and penetration requirements specified herein. These processes include thermal treatments of some species of poles, and double-diffusion treatments of posts, poles, and lumber. Reference is made to TT-W-572, Wood Preservative, Water Repellent, for the treatment of items such as window sash that are used under mild exposure conditions whereby adequate protection is afforded by short-dip treatments.