Quantcast Table III. Treatment of Special Wood Products -Cont. - mo3120212

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Product and use conditions
Other requirements
Requirements
on
treatment
Assay
Retention  1/ zone
Penetration
In and/or
In
pct of sapwood
Pcf
--
--
--
--
Mired hardwood species commercially
Mine
timbers
available  are  acceptable.
--
--
--
See table I, timbers
Do.
For  structures
classified
in ground contact
as  permanent
Do.
--
5 pct solution of either acid
For other structures
Refusal --
copper chromate, or fluor-
chrome-arsenate-phenol  mixture
or 8 percent solution of
chromated  zinc  chloride
--
Prior to treatment, lumber shall
Lumber for use in contact with,
2.5 or 5.0 pet solubilized
0.25 --
be milled to correct width and
copper-8-quinolinolate  (AWPA
or in close proximity to,
by gage
thickness, and, if practical,
foodstuffs
P8) dissolved in volatile
cut to correct length. Surface
solvent (AWPA P9)
of treated wood shall be clean
and free of residual solvent.
--
--
--
--
Only seasoned lumber 2 in. or less
Lumber for building foundations
in thickness.  Each charge
shall be assayed.
Lumber shall be incised prior to
0.5 and 90
Ammoniacal copper arsenite or
0-0.60
Douglas-fir,
western
larch
0.60
treatment.
chromated  copper  arsenate
(types I, II, or III)
Do.
Western hemlock
Ammoniacal copper arsenite or
0.5 and 90
0.60
0-0.60
chromated  copper  arsenate
(types I, II or III)
Lumber shall contain not more
Southern and ponderosa pines
Ammoniacal copper arsenite or
0.7 or 90
0.60
0-0.60
than 20 pct heartwood and no
chromated  copper  arsenate
boxed heart.
(types I, II, or III)
Plywood
Creosote  3/
Exterior grade plywood shall be
For use in coastal waters
See 4.2.5 Each veneer
25.0
penetrated
used.
Ammoniacal copper arsenite or
See 4.2.5 ....do....
2.50
chromated  copper  arsenate
(Types I, II or III)





 


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