Basement insulation, specifically extruded polystyrene (XPS) insulation, is the best basement insulation to use for residential basement construction. Dow Chemical invented XPS insulation, giving it a closed cell structure that proved to be ideal for use in basement insulation projects. There are no holes or voids that would allow water to penetrate. In fact, Dow’s XPS insulation is so waterproof that it is used to make billets for floating docks. Because it has high …

As a homeowner, you are not legally permitted to perform your own renovation work, with the exception of the electrical, but it is strongly recommended amateurs not do this as disastrous results can occur.