scope:

General Requirements:

Wood products to be used in permanent locations where exposed to decay or attack by other wood-destroying organisms should be impregnated with a preservative chemical(s). Only those species and preservatives specified in AWPA Standard U1 have previously been found suitable for use in this particular application, or sufficient test information has been submitted to warrant their inclusion.

The end use of a wood product to be treated should be specified so that the treating organization can provide, within the limits of variability inherent in the materials and methods, the most satisfactory treatment for that particular product.

The preservative chemical specified shall be chosen from one of the AWPA Preservative Standards ("P" Standards).

The preservative or preservative/protectant system specified, including retention required, shall be chosen from the AWPA Standard U1.

Heating times and temperatures during drying and/or treatment of poles and piles manufactured from species included in AWPA Standards U1 and T1, excluding Alaska Yellow Cedar and Western Red Cedar, should be sufficient to obtain a temperature of at least 66oC (150oF) at the pith center of the entire pole or pile for at least one hour, to assure sterilization.

Only wood free from defects which will render it unfit for its intended end-use should be treated. Preservative treatment will not restore any loss of strength resulting from defects of any kind.