What type of wood is recommended for outdoor projects due to its decay resistance?

Cedar and treated lumber are recommended for outdoor projects due to their inherent decay resistance. Cedar has natural oils that provide a stronger defense against moisture and insects, making it less susceptible to rot compared to many other woods. This makes it an ideal choice for outdoor furniture, decks, and structures that are exposed to the elements.

Treated lumber, on the other hand, has been chemically treated to resist decay, insects, and other environmental factors that can compromise the wood's integrity over time. This treatment is especially advantageous for wood used in ground contact applications, such as deck posts and fence boards.

In contrast, while oak is durable for many indoor applications, it is not commonly recommended for outdoor use as it can still decay if not properly maintained. Pine, although widely used in construction, is less durable in outdoor environments unless it is treated or sealed. Birch does not have the natural decay resistance of cedar or the chemical treatment that enhances the longevity of treated lumber, making it a less suitable choice for outdoor projects.