Building Code Compliance
2015 International Residential Code (IRC) - R317.1.1 reads
"Field-cut ends, notches and drilled holes of preservative-treated
wood shall be treated in the field in accordance with AWPA M4"
2015 International Building Code (IBC) - 2303.1.9 Preservative-treated wood "Lumber, timber, plywood, piles and poles supporting permanent
structures required by Section 2304.12 to be preservative treated shall conform to the requirements of the applicable AWPA U1 and M4 for the species, product, preservative and end use."
2015 AWPA M4 Standard - Section 6.2 states,
"Lumber, timber and decking used in structural applications shall be field treated in accordance
with Section 6.1 when cut or drilled during construction."
2015 AWPA M4 Standard - Section 7.1.1 recommends
"Copper Naphthenate preservatives
containing a minimum of 2.0% copper metal"
Using Tenino Copper Naphthenate (2% as metal) to treat all cuts satisfies the requirements of AWPA Standard M4!
Treated Wood Warranty Protection
Pressure treated such as MicroPro, LifeWood, EcoLife, AC2, Wolmanized, EraWood and others have warranties which exclude coverage when
cuts, holes, etc. are not field treated with a brush on end cut solution during construction. Each warranty's language differs (see specific products warranty for exact
language), in most instances Tenino Copper Naphthenate with 2% metallic copper fulfills the warranty exclusion clause for
field treatment. If your lumberyard or building supply store doesn't carry Tenino 2% Copper Naphthenate, protect your investment and demand
Tenino whenever you use pressure treated wood or lumber with a limited warranty.
Broad Use and Safer Handling
Copper Naphthenate provides protection against wood decay and the superior water repellent qualities of an
oil borne wood preservative. Copper Naphthenate treatments result in wood that is cleaner to the touch,
with minimal excess preservative coming in contact with the environment. Copper Naphthenate is the green
choice in preservatives because it is not a restricted use pesticide. With durability equal to or better
than other preservatives, it is a great choice for bridge timbers, barn timbers, glulam beams, salt storage
domes, protector boards and highway railings. For many applications copper naphthenate is the best wood
preservative available to contractors and builders. Use copper naphthenate when wood will be in contact
with the ground and as an an end-cut treatment for pressure-treated wood.
Formosa Subterranean Termite Protection
Copper is both repellent and toxic to termites. The University of Hawaii has found Copper Naphthenate in wood
at loadings of 1.5 lbs. per cubic foot is resistant to Formosan Termite attack and degradation. Tenino will
successfully protect against termites only if minimum loadings and sufficient penetration are achieved. Tenino
is best used to supplement pressure-treated preservative wood protection in aggressive hazard class environments envisioned
in AWPA Use Category 4, 4B,4C.
Reveals Natural Wood Grain
The bright green color of wood freshly treated with copper naphthenate will become brown in outdoor exposure.
Multiple studies demonstrate no
excessive corrosion of hardware and fasteners due to contact with the preservative.
Copper Naphthenate has been used as a wood preservative for over one hundred years with many applications for
use including; field boxes, benches, flats, fence posts, canvas, burlap, ropes, nets, greenhouses,
utility poles, crossarms, and wooden structures in ground contact and above ground contact. The American Wood
Protection Association's (AWPA) standardization process has confirmed oil-borne copper naphthenate's efficacy
as a wood preservative. The USDA Forest Service Forest Products Laboratory has documented in field trials copper
naphthenate's long-term protection performance.
Copper Care Wood Preservatives, Inc. formulates Tenino Copper Naphthenate with low VOC oils to comply with the South Coast Air Quality Management
District's (SCAQMD) Rule 1113, and ICC 700 National Green Building Standard (NGBS) with less than 350 VOC grams per
liter. Tenino is 100% domestically sourced from recycled copper and reclaimed by-products.