Southern Pine Products (Southern Forest Products Association)

SOUTHERN PINE PRESERVATIVE RETENTIONS & APPLICABLE AWPA STANDARDS

	Waterborne Preservatives²				Creosote and Oilborne Preservatives³
	Ammoniacal Copper Arsenate (ACA)	Ammoniacal Copper Zinc Arsenate (ACZA)	Chromated Copper Arsenate (CCA)	AWPA Standard(s)	Creosote	Creosote- Petroleum	Creosote Solutions	Pentachlo- rophenol (Penta)
Lumber, Timbers & Plywood	Retention Assay of Treated Wood - lbs.cu.ft.
Above Ground	0.25	0.25	0.25	C2/C9	8⁵	8⁵	8⁵	0.40
Soil & Freshwater use	0.40	0.40	0.40	C2/C9	10⁵	10⁵	10⁵	0.50
Permanent Wood Foundation (PWF)	0.60	0.60	0.60	C22	NR	NR	NR	NR
Saltwater use	2.5	2.5	2.5	C2/C9	25	NR	25	NR
Piles
Land or freshwater use & foundations	0.80	0.80	0.80	C3	12	12	12	0.60
Marine
Prevalent Marie Organism
Teredo only	2.5⁴	2.5⁴	2.5⁴	C18	NR	NR	NR	NR

Pholads only	NR	NR	NR	C18	20	NR	20	NR
Limnoria tripunctata only	2.5⁴ and 1.5	2.5⁴ and 1.5	2.5⁴ and 1.5	C18	NR	NR	NR	NR
Sphaeroma terebrans or for both pholads and limnoria tripunctata use a dual treatment
First treatment	^1.0	1.0	1.0	C18	-	-	-	-
Second treatment	^-	-	-	C18	20	-	20	-
Poles
Utility
Normal	^0.60	0.60	0.60	C4	7.5	7.5	7.5	0.38
Severe service conditions (high incidence of decay and termite attack)	0.60	0.60	0.60	C4	9.0	9.0	9.0	0.45
Building Construction - Round	0.60	0.60	0.60	C23	9.0⁵	NR	NR	0.45
Posts
Commercial-Residential
Fence
Round, half-round, and quarter-round	0.40	0.40	0.40	C5	8⁵	8⁵	8⁵	0.40
Sawn four sides	0.40	0.40	0.40	C2	10⁵	10⁵	10⁵	0.50
Highway Construction
Fence, Guide, Sign, and Sight Posts
Round, half-round, and quarter-round	0.40	0.40	0.40	C14	8	8	8	0.40
Sawn four sides	0.40	0.40	0.40	C14	10	10	10	0.50
Guardrail and Spacer Blocks
Round	0.50	0.50	0.50	C14	10	10	10	0.50
Sawn four sides	0.60	0.60	0.60	C14	12	12	12	0.60

NR- Not Recommended

(1) AWPA Standards detail plant operating procedures for pressure treatment of wood. These Standards include minimum vacuum, pressure, penetration requirements, and maximum steaming parameters. AWPA also details minimum retention requirements, sampling zones for assay and maximum redrying temperature allowance for each preservative, commodity, and wood species. For a copy of the AWPA Standards booklet, please write to the American Wood Preservers' Association, P.O. Box 286, Woodstock, Maryland 21163-0286. (2) ACA. ACZA and CCA are the most commonly available waterborne preservative. Ammoniacal Copper Quat (ACQ) - Type B, Copper Citrate and CDDC are also approved by AWPA as waterborne preservatives for Southern Pine as lumber, timbers, and ties (3) Copper Naphthenate is also approved by AWPA as an oilborne preservative for specific wood species and applications excluding saltwater use. (4) The assay retentions are based on two assay zones - 0 to 0.5 inch, and 0.5 to 2.0 inches. (5) Not recommended where cleanliness and freedom from odor are necessary.

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