Encapsulation comes after making something waterproof. After installing water drainage and a sump pump, you can then add encapsulation. Encapsulation is made up of three parts: the endcap, a dehumidifier, and spray foam. Encapsulation is a thick sheet of plastic that is secured to the walls of the basement. All of the seams are sealed, so any water that gets in along the wall will be caught by the endcap and led down into the water drainage.