Understanding why you have unwanted pests coming into your home is important and crucial for coming up with a plan to stop them. Just like any other pest, termites need food, warmth, moisture, and shelter to survive. They flock towards wood because it provides the ideal food source — cellulose — for them to thrive. Subterranean termite colonies live underground and enter homes at ground level or below, but may build mud tubes to enter spots that are above ground. It is most common, however, for termites to enter homes through wood-to-wood contact like door frames and porch step supports. Their entrance isn’t exclusive to just wood-to-wood contact, because they can also enter homes through cracks in the foundation of the home and holes in concrete blocks, traveling through foundation walls.