A device, method and kit for keeping humidity/water away from a concrete foundation and provide insulation. The method comprises the steps of providing a plurality of devices comprising a main body configured so as to be stackable and having opposed upper and lower surfaces each comprising a plurality of drainage openings therethrough, the main body forming a cavity therein encompassing a plurality of particles having a diameter larger than the openings' diameter, and positioning the plurality of devices in contact with a soil-facing surface of the concrete foundation such that the lower surfaces of the devices face downward.