Use Category System
The Use Category System provides a simple way of using the AWPA
Standards. The system was introduced in 1999 and defines Use
Categories, or biodeterioration hazard levels, for treated wood
products. The UCS assists specifiers and users in the
selection of the appropriate treatment for the end use of the
The advantage of the UCS is simplicity. All treated wood
products can be placed into one of five use categories, based upon
biodeterioration hazard and expected product performance. Fire
retardant treated products are placed in their own unique use
Using the UCS
Specifiers or users should first determine the use category by selecting the
expected service conditions. Then, locate the type of product needed and the species and
preservative most appropriate for the application.
Consideration of all of
these factors results in the treatment and inspection
requirements for that particular end use.
To purchase the complete Standard U1 which contains all listed
species/preservative/retention combinations for each AWPA Use
Category, please visit the
AWPA Store. The Use Category System standards are updated annually and are
published in the AWPA Book of Standards.