A
B
C
D
E
F
G
H
I
J
K |
Sawn Products
Permanent Wood Foundation (PWF)
Posts
Playground Material
Round Building Poles
Crossties and Switchties
Poles
Round Timber Piling
Wood Composites
Marine (Salt Water) Applications
Fire Retardants
Nonpressure Applications
Nonpressure Composites
Barrier Protection Systems |
NOTES:
Major classifications of treated wood commodities (A-K) displayed in
Table 4 are excerpted from the AWPA Book of Standards, Section 6, Commodity
Specifications. Section 6 provides detailed information on listed preservative
systems and allowable wood species applicable for each service
condition. Specifications and guidance for preservative-treated commodities
listed under Commodity Specification H, I, J and K are not included in Southern
Pine Council publications due to their specialized applications and/or proprietary
preservative systems. Southern Pine Council recommends end-users
contact manufacturers of the preservative systems and/or commodities
approved under these particular specifications ( H, I, J, K) to determine performance
and applicability to their project requirements.
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UC SYSTEM REPLACES COMMODITY STANDARD
The AWPA Use Category (UC) System was introduced in 1999 as a user friendly
format to eventually replace the Commodity (or “C”) Standard for
treatment specification. The Commodity Standard was deleted from the
AWPA Book of Standards beginning with the 2005 Edition. Commodity Standards
pertaining specifically to Southern Pine are displayed below for historical
context, and their continued influence on certain specifications. For
example, the “C” Standards in the AWPA Book of Standards, 2001 Edition,
were used as the basis for determining which categories of CCA-treated
commodities would be phased out of consumer use as of 2004.
COMMODITY STANDARDS: C1 - All Timber Products – Preservative Treatment by Pressure Processes;
C2 - Lumber, Timber, Bridge Ties and Mine Ties; C3 - Piles; C4 - Poles; C5 - Fence Posts; C6 - Crossties
and Switch Ties; C9 - Plywood; C11 - Wood Blocks for Floors and Platforms; C14 - Wood for Highway
Construction; C15 - Wood for Commercial – Residential Construction; C16 - Wood Used on Farms;
C17 - Playground Equipment; C18 - Marine Construction; C20 - Structural Lumber: Fire Retardant Treatment
by Pressure Processes; C22 - Permanent Wood Foundations, C23 - Round Poles and Posts used for
Building Construction; C24 - Sawn Timber used to Support Residential and Commercial Structures;
C25 - Sawn Crossarms; C27 - Plywood Fire Retardant Treatment by Pressure Processes; C28 - Glued Laminated
Members; C29 - Lumber and Plywood to be used for the Harvesting, Storage and Transportation of
Food Stuffs; C30 - Lumber, Timbers and Plywood for Cooling Towers; C31 - Lumber used Out of Contact with
the Ground and Continuously Protected from Liquid Water; C32 - Glue Laminated Poles; C33 - Structural
Composite Lumber; C34 - Shakes and Shingles
Specification Example:
Treated sawn-lumber joists supporting an outdoor deck |
1 — AWPA Use Category: UC3B
(from Table 3: Exterior Construction, Above Ground, Uncoated or poor water run-off Service Conditions. Typical Applications include deck joists)
2 — General Commodity Classification and Specification Section in the AWPA Book of Standards Sawn Products — A (from Table 4)
3 — Specific Commodity Classification: Joists (from Table 5A: Commodity — Joists, Use — Building Construction, Exposure — Above Ground, Exterior)
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4 — Species: Southern Pine
Preservatives and retention levels: Alkaline Copper Quat (ACQ) to .25 pcf or Copper Azole (CA-B) to .10 pcf (from Table 5C: Above Ground, Exterior)
5 — Special Requirements: None
(such as pre- or post-treatment preparations, including conditioning and drying such as Kiln Dried After Treatment, KDAT)
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