Pressure Treatments

MIL-HDBK-1011/1

and, although it is not preferred over wood for food and nests, they will eat

through it to find wood. If wood siding is desired, specify treated plywood

siding.

6.4.5

Rough Hardware. Hot-dip galvanize all ferrous metal hardware.

For

extreme exposed locations, consider stainless steel as a more appropriate

material.

6.5

Pressure Treatments

6.5.1

Decay and Insect Resistance. Pressure treat all construction

lumber timber with one of the following waterborne arsenical salts:

ammoniacal copper zinc arsenate (ACZA), or chromated copper arsenate (CCA).

Use the AWPB Standard LP-22 Standard for Softwood Lumber. Timber. and Plywood

Pressure-Treated with Water-Borne Preservatives for Above Ground Use, or LP-2

Procedure for Soft Wood Lumber, Timber. and Plwood Pressure Treated With

Water-Borne Preservatives for Above Ground Use, with a preservative retention

rate of 40 and 25 percent for soil contact and above ground respectively.

Prior to construction, treat the soil beneath a proposed structure with a

termiticide.

6.5.2

Finish Items. For finish items not exposed to weather, usually for

cabinets and millwork, one of the following waterborne preservatives may be

applied: 2 percent copper napthenate, 3 percent zinc napthenate, or 1.8

percent copper-8-quinolinolate. Only the copper-8-quinolinolate is permitted

for use on wood in contact with food. Always follow label directions when

using any preservative.

6.5.3

Fire Resistant Treatment. Wherever fire-retardant wood is

required, use a nonhydroscopic formulation in accordance with the American

Wood Preservers Association (AWPA) Standard C2, Lumber. Timber. Bridge Ties

and Mine Ties - Preservative Treatment by Pressure Process, and AWPA Standard

C9, Plwood- Preservative Treatment by Pressure Process. Fire-resistant

treated wood cannot be given a transparent finish. If a stained and clear

finish is required, consider the use of intumescent, transparent varnish.

6.6

Plastics

6.6.1

Polyvinyl Chlorides (PVCs). PVC pipe is not UV-resistant and is

not to be used above ground and exposed to sunlight: this includes exposure

during brief storage periods. If no alternative is possible and PVC must be

used above ground in rare instances, give it two coats of paint compatible

with PVC. ABS (acrylonitrile-butadiene-styrene) piping is UV-resistant and is

used for exposed applications.

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