A mounting device includes a base including an open bottom. An internal cavity is under the base for containing a sealant against with a roof when the mounting device is secured to the roof. An attachment member extends from the base. The attachment member has a first face and a second face opposite the first face. A plurality of openings are through the base for receiving a plurality of fasteners, respectively, when the mounting device is secured to the roof. The plurality of openings are in communication with the internal cavity. A sidewall of the base extends outward such that the base and the internal cavity extend beyond each of the first face and the second face.