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In the U.S., every plumbing fixture must also be coupled to the system's vent piping. [1] Without a vent, negative pressure from water leaving the system can slow flow (resulting in clogs) or cause a siphon to empty a trap. The high point of the vent system (the top of its "soil stack") must be open to the exterior at atmospheric pressure.
Shaped like a “U” or channel to catch water (e.g., where the edge of a tile roof meets a wall). Through wall flashing Spans the thickness of the wall and directs water to weep holes. Cap flashing (drip cap) Often used above windows and doors. Drip edge A metal used at the edges of a roof. Step flashing (soaker, base flashing)
I suspect most people are more familiar with the stack-on-the-roof sewer vent, so I wrote the article more around those, and left the AAV link if people want more information. Finally, a picture of a residential building with a sewer vent would be very useful, as would a diagram of a vent, two traps, and sewer line.
Copper Leader Head at Penn's Quadrangle, Philadelphia 1894 Copper Leader at Shofuso Japanese House and Garden in Philadelphia. The purpose of a leader head is to help transfer excess water from the roof onto downspouts, thus preventing the gutters from overflowing and water washing over the walls, which is a common occurrence in areas susceptible to heavy rain cycles.
Discrete trough of metal, or other material that is suspended beyond the roof edge and below the projected slope of the roof. Wall integral structure beneath the roof edge, traditionally constructed of masonry, fashioned as the crowning element of a wall. [10] A roof must be designed with a suitable fall to allow the rainwater to discharge.
It also saw a new skillion roof installed at the rear of the cottage, new walls, floor and ceiling, French doors, services, and the restoration of the yard. [4] The cottage was sold at auction by Sydney Water in 2017 for $1,405,000. [5] The adjacent sewer vent remains owned by Sydney Water following the cottage sale. [3]