Pressure treated wood has been used for many years for telephone poles, docks, bridges and even as building foundations in the place of masonry. Decks will almost always be constructed using pressure treated wood for the framing materials. Treated wood meets a variety of essential requirements for this purpose. It is strong, straight, resistant to decay and insect infestation, highly durable, easy to work with, has widespread availability and is inexpensive. Pressure treated wood can also be used as a low cost alternative for decking and rail material but is usually considered too unstable as it can warp and split as it dries in the sun. Cedar and redwood are preferable for their aesthetics appeal. Health concerns over high exposure levels and its ugly greenish color usually limit its use for visible surfaces.

Caution: Never burn treated lumber. This can release toxic fumes that are dangerous to breathe. Always use a dust mast when cutting treated lumber. Make sure to wash your hands before eating after handling treated lumber. Do not allow young children to come into contact with treated wood.