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  • Lumber treated to resist weather, termites and fungus.
  • Treatment involves chemical preservatives forced deep into the cells in the wood under pressure.
  • Wood used for decks and other outdoor consumer use is generally treated with an inorganic chemical. In 2004, the EPA outlawed the use of arsenic as a method of treating wood. ACQ and copper azole are the current popular chemicals used.
  • Treated wood still absorbs water, and the treatment is not considered waterproof, but rather decay-proof.
  • Wood species typically used include Ponderosa pine, Lodgepole pine, Douglas fir, Hem-fir and Southern yellow pine.
  • Always wear respiratory protection when cutting treated lumber.

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