Minnesota Department of Transportation

511 Travel Info

Approved/Qualified Products

Treated wood

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Table 1: MnDOT approved preservatives for the treatment of timber products*
Product and usage AWPA use category AWPA commodity specification U1 MnDOT approved wood treatment (see Table 2 below)
Section Special Reqs.

A Piles

A1 – Round UC4C** E - Penta, CuN, ACQ-D

B Posts: Fence, Guide & Sight

B1 – Round

UC4A**

B

-

Penta, MCA, CuN, ACQ-D

B2 – Sawn Four Sides UC4A** A Sub Sec 4.3 Penta, MCA, CuN, ACQ-D

C Posts: Guardrail & Spacer Blocks, Noise

C1 – Round UC4B** B - Penta, MCA, ACQ-D
C2 – Sawn Four Sides UC4C** A Sub Sec 4.3 Penta, MCA, ACQ-D

D Poles, Lighting

D1 – Round UC4B** D - Penta, MCA, CuN, ACQ-D

E Lumber and Timber

E1 – Bridges, Prefab (nail laminated) Panels, other Structural Members, Culverts and other uses UC4C** A Sub Sec 4.3 Penta
E2 – Noise Wall Facing – at or below ground level UC4B** A - Penta, MCA, ACQ-D
E3 – Building Construction or Repair – at or below ground level UC4A** A - Penta, MCA, CuN, ACQ-D
E4 – Decks, porches, handicap ramps, boardwalks, or pedestrian bridge decking UC4A** A Sub Sec 4.3 Penta

F Lumber and Timber (not in contact with ground or water

F1 – Handrails, Sidewalk Plank UC3B A Sub Sec 4.3 Envp, PTI, MCA, ACQ-D
F2 – Noise Wall Facing – above ground level UC3B A Sub Sec 4.3 Envp, PTI, MCA, ACQ-D
F3 – Building Construction or Repair UC3B A Sub Sec 4.3 Envp, PTI, CuN, MCA
F4 – Bridges, Prefab (nail laminated) panels, structural members, and other uses UC4C** A Sub Sec 4.3 Penta

G Glue-Laminated Structural Members (treated after gluing)

G Glue-Laminated Structural Members (treated after gluing) UC4B** F - Penta, MCA, CuN

H Plywood

H1 – In contact with ground or water UC4A** F - Penta, MCA, ACQ-D
H2 – For use above ground UC3B F - Envp, PTI, CuN, MCA, ACQ-D

* MnDOT approved preservatives does not include the actual wood treated product. MnDOT functional offices approve the final treated wood product for use on specific MnDOT projects.

** Products listed by the AWPA or approved by the International Code Council-Evaluation Service (ICC-ES) must submit documentation as proof of passing results from test method AWPA E7, substitution of test method AWPA E20 is not acceptable.

*** Sub section 4.3: Retreatment. Poles may be retreated provided none of the limitations is AWPA Standard T1 - "Use Category System: Processing and Treatment Standard," Section 6 (entitled "Retreatment") are exceeded.

Table 2: Product definition and MnDOT use restriction of approved wood treatments
Treatment Definition AWPA/ICC-ES Specification Requirements Standard AWPA Method for Determining Retention**** Use Restrictions
Envp Envirosafe Plus  (disodium octaborate tetrahydrate with binder for exterior use) ICC-ES AC326 A21-16 (B) or A40-13 (B) or A64-17 (B) Structural members must not be in contact with soil.

PTI

Non-metal pesticide treated wood.
Propiconazole
Tebuconazole

Imidacloprid

AWPA P45-14 A28-14 (Azoles) or A31-15 (Azoles), A43-14 (Imidacloprid) or A48-15 (PTI) Cannot use within 100 feet of surface water*. Structural members must not be in contact with soil.
CuN Copper naphthenate AWPA P36-16 A14-17 (Cu) or A84-12(Cu) or A88-12 (Cu) or A9-16 (Cu X-ray spectroscopy) Cannot use within 100 feet of surface water*. Cannot use within 100 feet of residential or recreational areas**.
Penta*** Non-aqueous pentachlorophenol AWPA P35-16 A83-12 (Lime ignition) or A9-16 (Cu X-ray spectroscopy) Non-aqueous pentachlorophenol wood products will be phased out of use as appropriate approved products with better environmental performance become available.
MCA Micronized Copper Azole

ICC-ES
ESR-2240
AC 326
AWPA P61-16

A21-16 (Cu) or A61-17 (Cu) or A9-16 (Cu X-ray spectroscopy), A28-14 (Azoles) or A31-15 (Azoles)

Cannot use within 25***** feet of surface water*. Fasteners must be in accordance with ESR-2240 sec. 4.3 and sec. 8.3.
ACQ-D Alkaline Copper Quanternary- Type D AWPA P29-14 A9-16 (Cu) or A21-16(Cu), A16-16 (Quat) or A17-15 (Quat) or A37-17 (Quat)

Cannot use within 25 feet of trout listed waters (MN7050.0470). Cannot use within 5 feet of other surface water*.

Fasteners must be in accordance with IBC 2304.10.5.

* For purposes of this document, surface water is considered to be a permanent water such as, but not limited to; rivers, streams, creeks, lakes, or ponds (not including artificially constructed sediment ponds).

** Residences are characterized by the single-family or multiple-family dwellings. Recreational areas are characterized by unrestricted access to the public and include, but are not limited to; parks, playing fields, beaches, green spaces, open areas, wildlife management areas, and nature preserves. Setback distance from recreational area should be determined from vicinity where people likely congregate (example: picnic or playground areas).

*** Unless otherwise specified, the pentachlorophenol solution for wood treatment shall consist of not less than 5.0 percent of pentachlorophenol in heavy petroleum solvent (AWPA A9, Type A.

**** Penetration and other treatment requirements shall be in accordance with AWPA Standard T1 and the AWPA Use Category Standards listed in Table 3491-1.

***** An MCA noise wall installed parallel (or approximately) to a surface water shoreline (lake, reservoir, impoundment, or stream) should be no closer than 25 feet. A noise wall installed perpendicular to or angled towards a surface water shoreline should, at no point along the wall, be closer than 20 feet to surface water.

Building structures with MCA treated wood such as pole barns, storage sheds, garages, boardwalks, or out-houses should be no closer than 6 feet to a surface water shoreline. (Minnesota Department of Natural Resources setback distances from surface water may apply.)

Guard rail barriers or similar low wood mass structure constructed with MCA treated wood posts installed parallel to a surface water shoreline should be no closer than 3 feet.

Guard rail barriers or similar low wood mass MCA treated wood structure installed perpendicular or angled towards a surface water shoreline should be no closer than 3 feet.