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Construction for Landscape Architecture by Jamie Liversedge, Robert Holden

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Wood preservatives

Wood preservatives protect from biological attack, such as fungal and bacteriological damage.

The two main processes involved are:

  • high-pressure vacuum treatment; and
  • double-vacuum low-pressure treatment.

The preservative treatments used can be classified as:

  • staining;
  • painting;
  • oiling; or
  • impregnation;

and these can be applied thus:

  • brush and spray, as with painting, which requires repeating typically every four to five years; or by the use of preservative gels;
  • deluge, dip, or steep for a short period of minutes, usually combined with organic solvent treatments;
  • hot and cold open-tank method—used for fence posts, which are submerged in tanks, heated to 176–194ºF and simmered for two to three hours; the preservatives ...

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