Abstract: A channel-shaped elongated member has a first wall which is opposite a second wall, and a floor. The second wall has a distal portion, also bifurcated into a primary wall and a secondary wall, forming a receiving channel. There is also a sealing means for forming a watertight seal between an underlayment waterproofing material and the receiving channel. In one embodiment, the receiving channel is composed of a malleable material wherein the primary wall of the receiving channel is externally marked in order to provide a guideline for crimping the channel thereby ensuring a watertight seal after the application of caulk. In another embodiment, the primary wall of the receiving channel is angled toward the secondary wall in order to firmly receive an underlayment waterproofing material, thereby forming a watertight seal when caulk is added.