Whether an addition to your existing house or new build, using pressure treated wood is the way to go.
A wood foundation consists of pressure-treated Southern Pine lumber, the industry standard that arrives at the construction site able to withstand decay and insects such as termites. Wood has an advantage over concrete, being able to be installed in most weather conditions. Wood can be prefabricated to fit the individual home. As for the basement, a concrete foundation requires an interior frame wall inside the concrete. However, a wood foundation serves as both the foundation and wall, thus providing more living space in the basement.
While concerns exist about the long-term reliability of wood due to decay and insect infestation, properly treated wood will function as well as concrete for the foundation and structure of the home and basement.
Moisture remains a problem in basements due to being underground, causing concrete flooring to be the choice to counteract that problem. Because it is difficult to prevent the moisture problem totally, true wood flooring is not normally recommended. Instead, either laminate or engineered wood are possibilities for the appearance of wood that will resist
Wood basements favor future expansion. Homeowners who decide to remodel can easily frame wood foundations for additions, either to the upper structure alone or to increase the size of the basement. Modifying the wood foundation is less
complicated and costly than if the foundation is concrete.