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Wood - Preservation


Quiz Questions

1.Wood can be protected from the attack of decay fungi, harmful insects, or marine borers by applying chemical preservatives.
True
False
2. Wood preservatives that are applied at recommended retention levels and achieve satisfactory penetration can greatly increase the life of wood structures.
True
False
3.What does AWPA stand for?
American Wood-Preservers’ Association
American Wild Preservative Acid
American Wood Power Association
None of the above
4.The EPA regulates pesticides, and wood preservatives are one type of pesticide. Preservatives that are not restricted by EPA are available to the general consumer for non-pressure treatments, and the sale of others is restricted to certified pesticide applicators.
True
False
5.Restricted use preservatives refer to the chemical preservative and not to the treated wood product. The general consumer may buy and use wood products treated with restricted-use pesticide.
True
False
6.Consumer information sheets are available for three major groups of wood preservatives:

  1. Creosote pressure-treated wood
  2. Pentachlorophenol pressure-treated wood
  3. Inorganic arsenical pressure-treated wood
True
False
7.Wood preservatives can be divided into two general classes:

  1. Oil borne preservatives, such as creosote and petroleum solutions of pentachlorophenol and
  2. Waterborne preservatives that are applied as water solutions.
True
False
8.

The three expo- sure categories for preservatives are:

  1. Ground contact (high decay hazard that needs a heavy-duty preservative),
  2. Aboveground contact (low decay hazard that does not usually require pressure treatment), and
  3. Marine exposure (high decay hazard that needs a heavy-duty preservative or possibly dual treatment).
True
False
9.Wood does not swell from treatment with preservative oils, but it may shrink if it loses moisture during the treating process. Creosote and solutions with heavy, less volatile petroleum oils often help protect wood from weathering, but may adversely influence its cleanliness, odor, color, paint ability, and fire performance.
True
False
10.The character of the tar used, the method of distillation, and the temperature range in which the creosote fraction is collected all influence the composition of the creosote.
True
False
11.Zinc naphthenate is different to copper naphthenate but is more effective in preventing decay from wood-destroying fungi and mildew.
True
False
12.Chlorothalonil (CTL) [tetrachloroisophthalonitrile] is an organic biocide that is used to a limited extent for mold control in CCA-treated wood (AWPA P8).
True
False
13.Tebuconazole (TEB) is an organic triazole biocide that is effective against wood decay fungi, but its efficacy against insects has not yet been evaluated.
True
False
14.Effective water-repellent preservatives will not retard the ingress of water when wood is exposed above ground.
True
False
15.Preservative systems containing water-repellent components are sold under various trade names, principally for the dip or equivalent treatment of window sash and other millwork.

True
False
16.What does NWWDA stand for?
National Wood Window and Door Association
National Wood Wild and Door Association
National Wild Water and Door Association
None of the above
17.Three types of chromated copper arsenate (CCA) Types A, B, C are covered in AWPA P5, but Type C is by far the most commonly used formulation.
True
False
18.Copper bis (dimethyldithiocarbamate) (CDDC) is a reaction product formed in wood as a result of the dual treatment of two separate treating solutions.
True
False
19.The effectiveness of preservative treatment is influenced by the penetration and distribution of the preservative in the wood. For maximum protection, it is desirable to select species for which good penetration is best assured.
TRue
False
20.Drying of wood before treatment is not necessary to prevent decay and stain and to obtain preservative penetration.
True
False