Pressure-treated wood garden benches are built to last, but they still need proper care to maintain their beauty and structural integrity for years. The best treatment involves a combination of regular cleaning, timely sealing, and protective maintenance.
Start by allowing new pressure-treated lumber to fully weather and dry for several months—often a full season—before applying any sealant. This lets the preservatives settle and moisture escape. For ongoing care, clean the bench annually with a mild detergent and a soft brush to remove dirt, mildew, and debris. Rinse thoroughly and let it dry completely.
The most critical step is applying a high-quality water-repellent sealant or stain designed for pressure-treated wood. Look for products containing UV inhibitors and mildewcide. A penetrating oil-based sealant is often recommended as it soaks into the wood fibers, providing a durable barrier against moisture and sun damage. Apply the sealant evenly with a brush or roller, following the manufacturer's instructions, and plan to reapply it every one to two years depending on your local climate and sun exposure.
Avoid painting pressure-treated wood, as it can trap moisture. Instead, use semi-transparent stains if you desire color. For existing benches showing signs of graying or wear, a light sanding before cleaning and sealing can restore the surface. With this simple regimen, your bench will remain a sturdy, attractive fixture in your garden for decades.