How AWPB stands behind its stamp

By Donn Keefe V.P./Chief Inspector American Wood Preservers Bureau

a|IUALITY control is an impor- tatant function in the manufacture of any product, and this is no less true with pressure treated lumber.

Quality control in the form of internal checks at plants, assurance checks by independent third party inspection agencies, and overview of the total process by the American Wood Preservers Bureau is now and has been for years an integral part of the pressure treatment process at a large number of treating plants in the United States.

Symbolic of this is the AWPB Quality Mark, probably better known as the LP 2 or LP 22 stamp.

Story at a Glance

AWPB sets standards for pressure treated wood acts as a watch dog of quality control . . stamp assures wood will perlorm as promised.

Nearly everyone in pressure treated lumber sales is familiar with these stamps, but it is surprising just how little is known about the quality control and quality assurance program behind them-what they stand for and what can or cannot be stamped.

LP 2 and LP 22 refer to AWPB Standards LP 2 and LP 22 for pressure treatment of softwood lumber, timbers and plywood with water-borne preservatives. Treatments covered in the Eastern states

P.O. Box 591 Lake OsweSo, OR 97304 (503) 636-2r81 California Lumber Inspection

P.O. Box 6989 San Josc, CA 95150 (408) 297-8071

Roule 4, Box 367 Per.y, FL 32347 (904) 584-5221 are Ponderosa pine, red pine and Southern pine, treated with CCA (chromated copper arsenate), and Southern pine treated with ACC (acid copper chromate) and CZC (chromated zinc chloride). In the Western United States they cover the treatment of Ponderosa pine and incised hem-fir with CCA and incised Douglas fir and hem-fir with ACA

(ammonical copper arsenate) and CZC,

The stamping of other species treated with water-borne preservatives is prohibited because they are extremely difficult to treat with poor treatment always the result.

Although LP 2 and LP 22 are the main thrust of its programs, AWPB (Please turn to page 62)

Froehling & Roberlson, lnc

P.O. Bo\ 21524 3015 Dumbar(on Road Richmond, VA 21261 (804',,264-2101

Jason Assciales, Inc.

P.O. Box 42 454 Link Lane Fort Collins, CO 80522 (303) 482-6550

McCutchan Inspeclions, Inc. 8525 N. Lombard Slreer Por(land, OR 97203 (503) 286-0977

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