VIDEOClick to see full answer. Herein, how do you keep untreated wood from rotting? Tips for Preventing Wood Rot Always use decay-resistant or pressure-treated lumber for decks. When building an exterior project with wood, stain or paint all sides of each lumber piece before assembly. Don’t lean anything against your siding, such as old plywood, tools, and ladders. One may also ask, do you need to seal pressure treated wood? However, most pressure-treated wood should have periodic sealing against moisture, preferably every year or so. However, most of the water-repellent sealers sold at home centers, paint stores and lumber yards are suitable for pressure-treated wood as well as other outdoor woods such as cedar and redwood. Secondly, how can I make Treated Treated wood dry faster? Warp and distortion Use proper stacking techniques. As mentioned previously, by far the most important deterrent to warp is the adequate stacking, stickering, and weighing of a lumber stack. Avoid juvenile wood. Avoid processing branches or leaning trees. Avoid knots. Handle spiral or interlocked grain with care. How do you seal lumber? There are three surefire ways to waterproof your wood for years to come. Use linseed or Tung oil to create a beautiful and protective hand-rubbed finish. Seal the wood with coating of polyurethane, varnish, or lacquer. Finish and waterproof wood simultaneously with a stain-sealant combo.