4.
USE CATEGORY SYSTEM: USER SPECIFICATION FOR TREATED WOOD
Page 31 of 66
© 2015
Special Requirements: Some applications of treated
wood have unique requirements for preservatives, species and
process limitations of specific commodities. These include
the following:
4.1 Drying After Treatment. Drying after treatment may
be required for structural strength or dimensional stability.
Building codes may require drying after treatment where
wood treated with waterborne preservatives is used in
enclosed locations where drying in service cannot be readily
achieved. The moisture content in each piece of lumber
shall not exceed 19%, or that moisture content permitted by
grading rules for the species and size specified to be dried.
4.2 Lumber and Plywood for Permanent Wood
Foundation (PWF) UC4B Retentions. Permanent wood
foundations are constructed under the jurisdiction of building
codes and may require code approved quality marks. Use of
stainless steel fasteners is recommended for PWF.
4.2.1 Allowable Species and Preservatives
Species
Southern Pine
Red Pine
Ponderosa Pine
Scots Pine-Ger,
Scots Pine-Swe,
Patula Pine
Coastal Douglas-fir
Western Hemlock,
Hem Fir
Alpine Fir
Plywood
Preservatives
ACQ-B, ACQ-C, ACQ-D, ACZA,
CA-B, CA-C, CCA
ACQ-B, ACQ-C, ACQ-D, ACZA,
CA-B, CA-C, CCA
ACQ-B, ACQ-C, ACQ-D, ACZA,
CA-B, CA-C, CCA
ACQ-D, CA-B, CA-C
industry published grading rules for each specific species
except that after treatment, raised grain, checking, size
variations and incising marks are permitted. Plywood shall
conform to US Product Standard PS-1 with exterior glue and
softwood plies only. Plywood shall bear the mark of or have
a certificate of inspection issued by a qualified plywood
inspection agency.
4.2.5 Marking. Each piece of lumber and plywood treated
as Permanent Wood Foundation material under AWPA
Standards shall be marked by a qualified inspection agency to
identify the preservative, retention, Use Category (UC) level,
year of treatment, and the producer. The material also shall
be marked as Permanent Wood Foundation and have the
notation ADAT or KDAT to show the lumber or plywood has
been dried after treatment.
4.3 Lumber, Timbers, and Decking for Bridges,
Structural Members, Cribbing and Culverts, UC4C
Retentions (also includes members out of the water but
subject to salt water splash and/or ground contact exposure).
Species
Southern Pine
Coastal Douglas-fir
Western Hemlock
ACQ-B, ACQ-C, ACQ-D, ACZA,
CA-B, CA-C
ACQ-B, ACQ-C, ACQ-D, ACZA,
CA-B, CA-C, CCA
CCA
ACQ-B, ACQ-C, ACQ-D, ACZA,
CA-B, CA-C, CCA
Hem-fir,
Hem-Fir North
Preservatives
ACQ-B, ACQ-C, ACZA, CA-B, CA-C,
CCA, CR, CR-S, CR-PS, CuN, PCP-A,
PCP-C
ACQ-B, ACQ-C, ACQ-D, ACZA,
CA-B, CA-C, CCA, CR, CR-S, CR-PS,
CuN, PCP-A, PCP-C
ACQ-B, ACQ-C, ACZA, CA-B, CA-C,
CCA, CR, CR-S, CR-PS, CuN, PCP-A,
PCP-C,
ACQ-C, CA-B, CA-C
4.2.2 Heartwood Limit. The heartwood content in lumber
from Southern Pine, Red Pine, Ponderosa Pine, Patula Pine,
and Scots Pine-Ger treated as Permanent Wood Foundation
material shall not exceed 20% of the cross sectional area at
either end of each piece except that precision end trimmed
(PET) or 8 foot 2x6 or 2x8 basement studs shall have no
heartwood limitation provided each piece is legibly marked
"Stud Use Only" or "Basement Stud".
4.2.3 Drying After Treatment. Drying of Permanent Wood
Foundation lumber after treatment is required to assure
dimensional stability and structural strength. Moisture
content shall not exceed 19% in each piece of lumber. The
moisture content in each piece of permanent wood foundation
plywood shall not exceed 18%. The moisture content limit
for PWF lumber and plywood may not be waived.
4.2.4 Grade. Lumber used as Permanent Wood Foundation
material shall be manufactured and graded in accordance with
4.3.1 For Allowable Species and Preservatives listed under
4.3 use UC4B retentions for PCP-A and PCP-C and UC4C
retentions for all other allowable species and preservative
combinations.
4.4 Lumber and Timbers Used For Cooling Towers,
UC4A Retentions.
4.4.1 Allowable Species and Preservatives
Species
Southern Pine
Ponderosa Pine
Coastal Douglas-fir
Western Hemlock
Hem-fir,
Hem-Fir North
Redwood
Preservatives
ACQ-A, ACQ-B, ACQ-C, ACZA,
CA-B, CA-C, CCA, CR, KDS
ACQ-A, ACZA, CA-B, CA-C, CCA,
CR
ACQ-A, ACQ-B, ACQ-C, ACQ-D,
ACZA, CA-B, CA-C, CCA, CR, KDS
ACQ-A, ACQ-B, ACQ-C, ACZA, CA-
B, CA-C, CCA, CR, KDS
ACQ-A, ACQ-C, CA-B, CA-C, KDS
ACQ-A, ACQ-B ACZA, CCA, CR
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USE CATEGORY SYSTEM: USER SPECIFICATION FOR TREATED WOOD
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© 2015
4.5 Sawn Crossarms, UC3B, UC4A (for critical uses)
Retentions.
4.5.1 Allowable Species and Preservatives
Species
Southern Pine
Coastal Douglas-fir
Western Larch
Western Hemlock
Hem-fir,
Hem-Fir North
4.5.2 Penetration.
Preservatives
ACQ-A, ACQ-C, ACZA,
CA-B, CA-C, CCA, CR, CuN, PCP-
A, PCP-C,
ACQ-A, ACQ-C, ACQ-D, ACZA, CA-
B, CA-C, CCA, CR, CuN, PCP-A,
PCP-C
ACZA, CCA, CR, PCP-A,
PCP-C
ACQ-A, ACQ-C, ACZA, CA-B, CA-C,
CCA, CR, PCP-A, PCP-C
ACQ-A, ACQ-C, ACZA, CA-B, CA-C,
CCA, CR, PCP-A, PCP-C
Penetration of crossarms shall be
4.6.4.2 Western red cedar. Penetration of preservative
shall be complete from one face to the other, for a distance
of not less than 10 mm (0.2 in.) from the butt end, when
measured on one of the surfaces exposed by rip sawing from
the tip to the butt not closer than one inch from the edge of
the shake or shingle. If 50% of the pieces meet the
penetration requirement the charge will be accepted.
4.7 Decking Materials. This section covers special
retention requirements for decking surfaces and other
associated decking specialties such as spindles, railings, ball
tops, and lattice. These are exterior, above ground
applications where the useful life of the treated product is
generally limited by deterioration of appearance from
weathering. This listing is only for sawn lumber less than
50 mm (2.0 in.) in thickness and 150 mm (6.0 in.) in width
and for use in Deterioration Zones 1 through 4 as shown in
Standard U1, Commodity Specification D. The original
reason for the higher retentions than normal for above
ground uses was to compensate for the smaller (5mm) assay
zone for this material, which coincides with the smaller
(5mm) penetration depth requirement (See Standard T1
Section 8 A 13).
4.7.1 Allowable Species, Preservatives and Retentions
Species
Hem-fir
Hem-fir North
Douglas-fir
Lodgepole pine
Preservatives
ACQ-A,
ACQ-B
ACQ-C
ACQ-D
CA-B
CA-C
KDS
Retention kg/m 3 (pcf)
6.4 (0.40)
6.4 (0.40)
6.4 (0.40)
6.4 (0.40)
3.3 (0.21)
2.4 (0.15)
7.5 (0.47)
determined in accordance with T1.
4.5.3 Cleanliness. After treatment, the surface of all
crossarms shall be clean to the touch.
4.5.4 Retreatment. Material shall not be retreated more
than once.
4.6 Shakes and Shingles, UC3B Retentions
4.6.1 Allowable Species and Preservatives
Species
Southern Pine
Western Redcedar
Preservatives
ACQ-A, ACQ-C, ACQ-D, CA-B,
CA-C, CCA, CuN-W,
CX-A
ACQ-A, ACQ-C, ACQ-D, CA-B,
CA-C, CCA, CuN-W,
CX-A
4.6.2 Grade. After treatment, raised grain, checking, and
size variation in excess of published grade rules is
permitted.
4.6.3 Incising. Not required.
4.6.4 Penetration.
4.6.4.1 Southern pine. Penetration of preservative shall
not be less than 85% of the sapwood, as measured on a cross
section cut at a point where the piece is approximately 15
mm (0.6 in.) thick. If 90% of the pieces meet the
penetration requirement the charge will be accepted.
4.8 Sawn Timber Used to Support Residential and
Commercial Structures. Sawn timbers 125 mm (5.0 in.)
and thicker used as supporting members in building
construction where replacement would be difficult and/or
structural placement of these members require exceptional
durability.
Table 4.8.1 Allowable Species, Preservatives, and
Retentions
Species
Coastal
Douglas-fir
Preservatives
ACZA
Retention kg/m 3 (pcf)
13 (0.80)
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USE CATEGORY SYSTEM: USER SPECIFICATION FOR TREATED WOOD
Page 33 of 66
© 2015
COMMODITY SPECIFICATION B: POSTS
Jurisdiction: AWPA Technical Committee T-4
This Commodity Specification is promulgated pursuant to a consensus procedure.
1. Introduction: Commodity Specification B covers
preservative pressure treatment of wood posts. It includes
general requirements, minimum preservative retention
requirements for each Use Category, special requirements
and special information. Penetration requirements and assay
zones are tabulated in the Processing and Treatment
Standard (T1).
1.1 Posts covered under Commodity Specification B are
round, half round and quarter round less than 16' in length.
Commodity Specification B also includes playground
equipment, both sawn and round, and round building posts
and poles.
1.2 The preservative retention and penetration assigned to
the Use Category levels in Commodity Specification B are
minimum retention and penetration depths for the
commodity, preservative and species treated. They have
been found to be satisfactory for service in their Use
Category. Retentions may be raised above the minimum
and penetration depths increased beyond the minimum but
the need for such changes should be demonstrated and be
based on sound technical data. Th
4. USE CATEGORY SYSTEM: USER SPECIFICATION FOR TREATED WOOD Page 31 of 66 © 2015 Special Requirements: Some applications of treated wood have unique requirements for preservatives, species and process limitations of specific commodities. These include the following: 4.1 Drying After Treatment. Drying after treatment may be required for structural strength or dimensional stability. Building codes may require drying after treatment where wood treated with waterborne preservatives is used in enclosed locations where drying in service cannot be readily achieved. The moisture content in each piece of lumber shall not exceed 19%, or that moisture content permitted by grading rules for the species and size specified to be dried. 4.2 Lumber and Plywood for Permanent Wood Foundation (PWF) UC4B Retentions. Permanent wood foundations are constructed under the jurisdiction of building codes and may require code approved quality marks. Use of stainless steel fasteners is recommended for PWF. 4.2.1 Allowable Species and Preservatives Species Southern Pine Red Pine Ponderosa Pine Scots Pine-Ger, Scots Pine-Swe, Patula Pine Coastal Douglas-fir Western Hemlock, Hem Fir Alpine Fir Plywood Preservatives ACQ-B, ACQ-C, ACQ-D, ACZA, CA-B, CA-C, CCA ACQ-B, ACQ-C, ACQ-D, ACZA, CA-B, CA-C, CCA ACQ-B, ACQ-C, ACQ-D, ACZA, CA-B, CA-C, CCA ACQ-D, CA-B, CA-C industry published grading rules for each specific species except that after treatment, raised grain, checking, size variations and incising marks are permitted. Plywood shall conform to US Product Standard PS-1 with exterior glue and softwood plies only. Plywood shall bear the mark of or have a certificate of inspection issued by a qualified plywood inspection agency. 4.2.5 Marking. Each piece of lumber and plywood treated as Permanent Wood Foundation material under AWPA Standards shall be marked by a qualified inspection agency to identify the preservative, retention, Use Category (UC) level, year of treatment, and the producer. The material also shall be marked as Permanent Wood Foundation and have the notation ADAT or KDAT to show the lumber or plywood has been dried after treatment. 4.3 Lumber, Timbers, and Decking for Bridges, Structural Members, Cribbing and Culverts, UC4C Retentions (also includes members out of the water but subject to salt water splash and/or ground contact exposure). Species Southern Pine Coastal Douglas-fir Western Hemlock ACQ-B, ACQ-C, ACQ-D, ACZA, CA-B, CA-C ACQ-B, ACQ-C, ACQ-D, ACZA, CA-B, CA-C, CCA CCA ACQ-B, ACQ-C, ACQ-D, ACZA, CA-B, CA-C, CCA Hem-fir, Hem-Fir North Preservatives ACQ-B, ACQ-C, ACZA, CA-B, CA-C, CCA, CR, CR-S, CR-PS, CuN, PCP-A, PCP-C ACQ-B, ACQ-C, ACQ-D, ACZA, CA-B, CA-C, CCA, CR, CR-S, CR-PS, CuN, PCP-A, PCP-C ACQ-B, ACQ-C, ACZA, CA-B, CA-C, CCA, CR, CR-S, CR-PS, CuN, PCP-A, PCP-C, ACQ-C, CA-B, CA-C 4.2.2 Heartwood Limit. The heartwood content in lumber from Southern Pine, Red Pine, Ponderosa Pine, Patula Pine, and Scots Pine-Ger treated as Permanent Wood Foundation material shall not exceed 20% of the cross sectional area at either end of each piece except that precision end trimmed (PET) or 8 foot 2x6 or 2x8 basement studs shall have no heartwood limitation provided each piece is legibly marked "Stud Use Only" or "Basement Stud". 4.2.3 Drying After Treatment. Drying of Permanent Wood Foundation lumber after treatment is required to assure dimensional stability and structural strength. Moisture content shall not exceed 19% in each piece of lumber. The moisture content in each piece of permanent wood foundation plywood shall not exceed 18%. The moisture content limit for PWF lumber and plywood may not be waived. 4.2.4 Grade. Lumber used as Permanent Wood Foundation material shall be manufactured and graded in accordance with 4.3.1 For Allowable Species and Preservatives listed under 4.3 use UC4B retentions for PCP-A and PCP-C and UC4C retentions for all other allowable species and preservative combinations. 4.4 Lumber and Timbers Used For Cooling Towers, UC4A Retentions. 4.4.1 Allowable Species and Preservatives Species Southern Pine Ponderosa Pine Coastal Douglas-fir Western Hemlock Hem-fir, Hem-Fir North Redwood Preservatives ACQ-A, ACQ-B, ACQ-C, ACZA, CA-B, CA-C, CCA, CR, KDS ACQ-A, ACZA, CA-B, CA-C, CCA, CR ACQ-A, ACQ-B, ACQ-C, ACQ-D, ACZA, CA-B, CA-C, CCA, CR, KDS ACQ-A, ACQ-B, ACQ-C, ACZA, CA- B, CA-C, CCA, CR, KDS ACQ-A, ACQ-C, CA-B, CA-C, KDS ACQ-A, ACQ-B ACZA, CCA, CR - 35 - U1-15 USE CATEGORY SYSTEM: USER SPECIFICATION FOR TREATED WOOD Page 32 of 66 © 2015 4.5 Sawn Crossarms, UC3B, UC4A (for critical uses) Retentions. 4.5.1 Allowable Species and Preservatives Species Southern Pine Coastal Douglas-fir Western Larch Western Hemlock Hem-fir, Hem-Fir North 4.5.2 Penetration. Preservatives ACQ-A, ACQ-C, ACZA, CA-B, CA-C, CCA, CR, CuN, PCP- A, PCP-C, ACQ-A, ACQ-C, ACQ-D, ACZA, CA- B, CA-C, CCA, CR, CuN, PCP-A, PCP-C ACZA, CCA, CR, PCP-A, PCP-C ACQ-A, ACQ-C, ACZA, CA-B, CA-C, CCA, CR, PCP-A, PCP-C ACQ-A, ACQ-C, ACZA, CA-B, CA-C, CCA, CR, PCP-A, PCP-C Penetration of crossarms shall be 4.6.4.2 Western red cedar. Penetration of preservative shall be complete from one face to the other, for a distance of not less than 10 mm (0.2 in.) from the butt end, when measured on one of the surfaces exposed by rip sawing from the tip to the butt not closer than one inch from the edge of the shake or shingle. If 50% of the pieces meet the penetration requirement the charge will be accepted. 4.7 Decking Materials. This section covers special retention requirements for decking surfaces and other associated decking specialties such as spindles, railings, ball tops, and lattice. These are exterior, above ground applications where the useful life of the treated product is generally limited by deterioration of appearance from weathering. This listing is only for sawn lumber less than 50 mm (2.0 in.) in thickness and 150 mm (6.0 in.) in width and for use in Deterioration Zones 1 through 4 as shown in Standard U1, Commodity Specification D. The original reason for the higher retentions than normal for above ground uses was to compensate for the smaller (5mm) assay zone for this material, which coincides with the smaller (5mm) penetration depth requirement (See Standard T1 Section 8 A 13). 4.7.1 Allowable Species, Preservatives and Retentions Species Hem-fir Hem-fir North Douglas-fir Lodgepole pine Preservatives ACQ-A, ACQ-B ACQ-C ACQ-D CA-B CA-C KDS Retention kg/m 3 (pcf) 6.4 (0.40) 6.4 (0.40) 6.4 (0.40) 6.4 (0.40) 3.3 (0.21) 2.4 (0.15) 7.5 (0.47) determined in accordance with T1. 4.5.3 Cleanliness. After treatment, the surface of all crossarms shall be clean to the touch. 4.5.4 Retreatment. Material shall not be retreated more than once. 4.6 Shakes and Shingles, UC3B Retentions 4.6.1 Allowable Species and Preservatives Species Southern Pine Western Redcedar Preservatives ACQ-A, ACQ-C, ACQ-D, CA-B, CA-C, CCA, CuN-W, CX-A ACQ-A, ACQ-C, ACQ-D, CA-B, CA-C, CCA, CuN-W, CX-A 4.6.2 Grade. After treatment, raised grain, checking, and size variation in excess of published grade rules is permitted. 4.6.3 Incising. Not required.
4.6.4 Penetration.
4.6.4.1 Southern pine. Penetration of preservative shall
not be less than 85% of the sapwood, as measured on a cross
section cut at a point where the piece is approximately 15
mm (0.6 in.) thick. If 90% of the pieces meet the
penetration requirement the charge will be accepted.
4.8 Sawn Timber Used to Support Residential and
Commercial Structures. Sawn timbers 125 mm (5.0 in.)
and thicker used as supporting members in building
construction where replacement would be difficult and/or
structural placement of these members require exceptional
durability.
Table 4.8.1 Allowable Species, Preservatives, and
Retentions
Species
Coastal
Douglas-fir
Preservatives
ACZA
Retention kg/m 3 (pcf)
13 (0.80)
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U1-15
USE CATEGORY SYSTEM: USER SPECIFICATION FOR TREATED WOOD
Page 33 of 66
© 2015
COMMODITY SPECIFICATION B: POSTS
Jurisdiction: AWPA Technical Committee T-4
This Commodity Specification is promulgated pursuant to a consensus procedure.
1. Introduction: Commodity Specification B covers
preservative pressure treatment of wood posts. It includes
general requirements, minimum preservative retention
requirements for each Use Category, special requirements
and special information. Penetration requirements and assay
zones are tabulated in the Processing and Treatment
Standard (T1).
1.1 Posts covered under Commodity Specification B are
round, half round and quarter round less than 16' in length.
Commodity Specification B also includes playground
equipment, both sawn and round, and round building posts
and poles.
1.2 The preservative retention and penetration assigned to
the Use Category levels in Commodity Specification B are
minimum retention and penetration depths for the
commodity, preservative and species treated. They have
been found to be satisfactory for service in their Use
Category. Retentions may be raised above the minimum
and penetration depths increased beyond the minimum but
the need for such changes should be demonstrated and be
based on sound technical data. Th
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