Device for preventing water proof layer of roof from bulging and construction method for water proof layer of roof passing through air duct and attaching to parapet

The invention discloses a device for preventing a water proof layer of a roof from bulging and a construction method for the water proof layer of the roof passing through an air duct and attaching toa parapet. The device for preventing the water proof layer of the roof from bulging comprises a longitudinal pipe, and the lower end of the longitudinal pipe communicates with the left end of a transverse pipe; a filter screen is arranged in the upper end of the longitudinal pipe, and a rainproof cap located above the longitudinal pipe is arranged at the upper end of the longitudinal pipe; the longitudinal pipe is provided with a fixing piece for being connected with a wall, and a ring-shaped water stop ring piece is connected to an outer sleeve of the horizontal pipe; and the right end of thehorizontal pipe is connected to the left end of a roof exhaust pipe through a connecting piece. The device can play a good waterproof role, avoids the influence of heat expansion and cold contractionof the temperature and sun