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 As mentioned previously, each piece of pressure treated lumber, timber, or plywood shall bear a
mark or stamp that will be evidence of an independent inspection of the wood after it was preserv-
atively treated. Thus, to spot check incoming treated wood that was procured under approved in-
spection programs, one should locate the Quality Marks and read the included information to
determine what preservative was used and for what end-use application the material is intended.
When checking materials that have been inspected under the program of the American Wood
Preservers' Bureau, it is important to recognize that the Bureau has a number of "Inspection Stand-
standards provides information on both the preservative used and the intended use environment
for the treated wood. By carefully reading these marks (Figure 6-3) the person receiving the ship-
ment can determine whether the materials received are appropriate for the planned use. These in-
spection marks or stamps are:
LP-2 Pressure treated with water-borne preservatives for above ground use.
LP-22 Pressure treated with water-borne preservatives for ground contact use.
LP-3 Pressure treated with light hydrocarbon solvent-penta solution for above ground use.
LP-33 Pressure treated with light hydrocarbon solvent-penta solution for ground contact use.
LP-4 Pressure treated with volatile hydrocarbon solvent (LPG) penta solution for above
ground use.
LP-44 Pressure treated with volatile hydrocarbon solvent (LPG) penta solution for
ground contact use.
LP-5 Pressure treated with creosote or creosote-coal tar solutions for above ground use.
LP-55 Pressure treated with creosote or creosote-coal tar solutions for ground contact use.
LP-7 Pressure treated with heavy hydrocarbon solvent-penta solution for above
ground contact use.
LP-77 Pressure treated with heavy hydrocarbon solvent-penta solution for
ground contact use.
6-18
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