Parapet Roof Drainage Design

Working with manufacturers will help develop your understanding but don t delegate your design responsibility to them.

Parapet roof drainage design.

Keep the distance between drains to at most 200 ft. 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. Limit the number of parapet walls.

The drainage requirements for flat roofs on buildings present some special problems that we describe and illustrate here. This kind of drainage system is most common on small flat roofs where water volume and buildup isn t extreme. With a parapet wall it is possible for a roof to retain or pond water should the primary roof drainage system fail. Back up secondary emergency drainage system in case the primary drain.

Watch for clogs blockage at the roof drain or scupper. Provide adequate flashing for parapets openings walls joints skylights etc. However these days parapets add a lot more to a flat roof than just a cosmetic detail. This would be in situations where a retaining wall or parapet prevents direct access to the roof s edge.

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. From the edge of a valley. Architectural home design software all content support videos chieftalk forum.

The most dependable type of roof drainage design is the inverted pyramid pattern. At page top and at left our photos show a low slope roof surrounded by a parapet. In many cases these buildings have parapet walls that surround the perimeter of the roof. Typically surrounded with parapet walls to screen roof top equipment and to provide.

However parapets block the drainage of rainwater from freely flowing over the roof edge. Requires a primary drainage system with. If a building has roof access that residents use regularly for whatever reason adding a parapet greatly decreases the chance that someone could fall over the. Manually adjust roof planes to have a negative pitch to create a parapet wall structure with a center drain.

Adding a parapet wall makes a flat roof far safer than leaving the roof s edge exposed. Install a drain at most 50 ft. Parapet and valley gutters are treated differently because they have a higher risk of failure. From a roof edge.

It s also sometimes used in tandem with scuppers. Buildings that incorporate flat roofs with centralized roof drains and internal downspouts are another story.