Tenino Copper Naphthenate 17% (2% Metal) Double Strength – 1 Gallon Wood Preservative

Tenino Copper Naphthenate 17% (2% copper as metal) Double Strength is a ready-to-use oil-borne wood preservative designed for exterior applications. Packaged in a sturdy one-gallon resealable jug, it covers approximately 100–300 sq ft per treatment when brushed on. No mixing or dilution is required, making it convenient for fast, consistent application to a wide range of wood products that face the elements.

What it is and how it works

• 17% copper naphthenate formulation; contains 2% copper as metal for metal-based protection
• Meets AWPA M4 end-cut and exterior use standards, making it suitable for field treatments
• Low VOC under 350 g/L and domestically sourced from recycled copper and reclaimed by-products
• Labelled for General Use, and treated wood may be disposed of in local landfills in many cases
• Provides water repellency and is repellent to termites and other wood-destroying organisms

Key benefits and practical results

• Helps prevent moisture-related issues such as warping, swelling, shrinking and end checking due to moisture changes
• Offers protective action against termites and wood-destroying beetles and decay fungi
• Versatile for a variety of wood products including poles, fencing, siding, timbers, and decorative planters
• Supports both remedial and preventive treatment for standing structures like posts, poles, and beams
• Low odor, ready-to-use format makes on-site application straightforward for quick projects

Usage notes and practical applications

Each gallon provides flexibility for outdoor projects such as treating poles, piling, outdoor fencing, beams, cedar shakes, shingles, porches, docks, and even landscape timbers or window boxes. It is designed to supplement pressure-treated protection in aggressive environments and helps maintain wood performance in fluctuating climates.

Compliance, disposal, and safety

In accordance with AWPA Use Category 4,4B,4C guidelines and building codes IBC 2303.1.9 and IRC R317.1.1, Tenino supports exterior wood protection needs. The formulation is low VOC and domestically sourced; treated wood may be discarded in local landfills per local regulations. Always read label directions and observe safety precautions when applying.