Pressure-treated boards are treated for protection against termites and rot. Ideal for a variety of applications including decks, play sets, landscaping and other outdoor projects where lumber is exposed to the elements. When used properly it is both safe and environmentally friendly.Treated wood is typically still wet when it's delivered to The Home Depot or job site. As it dries, you should expect slight changes in width and length. As lumber dries, it may split, cup and warp. This is more likely to occur to occur in lower-grade boards, where knots and uneven grains are already present. Each piece of lumber is unique and carries physical characteristics that may include the following: knots, warping, shrinkage, swelling and/or splitting. Made of pine Can be used in ground contact applications 1 in. x 4 in. x 4 ft. Can be painted or stained Significantly improved corrosion resistance for metal fasteners WeatherShield includes water repellant in the treatment process No two pieces of lumber are the same. Color, grain pattern and texture will vary as well.