EQUAL PRESSURE DRAINAGE JOINT

PROBLEM TO BE SOLVED: To provide an equal pressure drainage joint which sufficiently ensures the water-tightness thereof, and can be built in a panel having a thickness of 50 mm or less. SOLUTION: The equal pressure drainage joint is formed of a vertical joint and a horizontal joint 3. The horizontal joint 3 is comprised of an airtight material 15 formed of an extrusion-molded body and arranged on a groove inner wall 5b, and flashing members 17, 19 each formed of an extrusion-molded body and arranged on a groove outer wall 5a, whereby the flashing members 17, 19 form a venting drain port 22 connecting the interior of a groove 7 to an outside space. Then, an inner wall throating 14 formed of an extrusion- molded body is arranged at least at a lower portion of the vertical joint in one body with the airtight material 15, and extended in a diagonally lower direction toward the lower flashing member 19, followed by abutting an end lower surface of the inner wall throating 14 on an upper side of the lower flashing member 19, whereby the vertical joint and an upper portion of the airtight material 15 of the horizontal joint are covered with the inner wall throating 14.