Shop for Lumber & Composites at The Home Depot. Every piece meets the highest grading standards for strength and appearance. This lumber is pressure treated in order to protect it from termites, fungal decay, and rot. Ideal for a variety of applications, including decks, landscaping, stair support, walkways and other outdoor projects where lumber is exposed to the elements. This lumber can be painted or stained. When used properly, it is both safe and environmentally friendly.