Parapet Roof Drainage Design

From a roof edge.

Parapet roof drainage design.

This would be in situations where a retaining wall or parapet prevents direct access to the roof s edge. Keep the distance between drains to at most 200 ft. Provide adequate flashing for parapets openings walls joints skylights etc. In these cases the.

Looking at a building from the ground a parapet may seem to simply be a design choice that adds little more than a characteristic look to a building. Limit the number of parapet walls. With a parapet wall it is possible for a roof to retain or pond water should the primary roof drainage system fail. This type of pattern is particularly useful on buildings that are easily divided into rectangular areas.

Roofs of this design will have one or more roof drains or scuppers installed. The premise of the pattern is that a drain is positioned in the center of the rectangular area and there is a four way positive slope into the drain. In many cases these buildings have parapet walls that surround the perimeter of the roof. The most dependable type of roof drainage design is the inverted pyramid pattern.

The drainage requirements for flat roofs on buildings present some special problems that we describe and illustrate here. Typically surrounded with parapet walls to screen roof top equipment and to provide. At page top and at left our photos show a low slope roof surrounded by a parapet. On larger and more complex schemes specialist consultants may be employed to design the rainwater drainage system.

However these days parapets add a lot more to a flat roof than just a cosmetic detail. Install a drain at most 50 ft. From the edge of a valley. This kind of drainage system is most common on small flat roofs where water volume and buildup isn t extreme.

Parapet and valley gutters are treated differently because they have a higher risk of failure. Requires a primary drainage system with. Watch for clogs blockage at the roof drain or scupper. Buildings that incorporate flat roofs with centralized roof drains and internal downspouts are another story.

Architectural home design software all content support videos chieftalk forum. However parapets block the drainage of rainwater from freely flowing over the roof edge. Adding a parapet wall makes a flat roof far safer than leaving the roof s edge exposed. Install a drain at most 50 ft.

Manually adjust roof planes to have a negative pitch to create a parapet wall structure with a center drain. It s also sometimes used in tandem with scuppers.