Guide to Flat Roof Drainage Solutions

Guide to Flat Roof Drainage Solutions

As stated by Frisco roofers, most people don’t give a second thought about their roof’s drainage system until they have problems. However, while each roof is different, the flat roof presents unique drainage challenges due to not having steep angles for the water to runoff naturally.

In this article, we look at some of the best
drainage solutions for a flat roof.

Defining Flat Roof Drainage System

If you don’t have adequate drainage on a flat
roof, you will experience water damage and water leaks, and while nearly all
drainage systems involve pipes and plumbing, how they’re implemented varies.
The three most common drainage systems for flat roofs are the interior drains,
scuppers, and gutters. In the next section, we’ll break these down and list the
pros and cons for each.


The interior drain works like a sink for your
flat roof. The drain is installed on the center of the roof and water is
carried away by pipes away from the building. The plumbing is set inside the
building which gives this system its name.

The pros for the interior drain is that since
the pipes are inside, they’re protected from the elements and debris. Also,
water runs to the center of the roof which reduces the likelihood of damage to
the building.

Cons for the interior drain are the cost of
installation, and you must clean out the filter regularly at the top of the
drain to ensure the water flows freely.


A scupper is a pipe that sticks out at the end
of a flat roof. They’re installed on the edges of the roof and water and debris
shoot out and go to another gutter where it eventually gets funneled to the

Pros for scuppers are they’re inexpensive and
easy to install and very efficient at eliminating water.

The biggest con to the scupper is they’re made
useless by ice that blocks the water from flowing. Water that isn’t drained
straight away can lead to water damage and leaks.


Gutters are the most common drainage systems
and are seen on virtually every building and house. Gutters normal drain water
into pipes which carry it away from the building.

Pros for gutters is they’re inexpensive and
easy to install; in fact, most people can install them themselves.

The biggest con of gutters is that while they can handle virtually any form of debris, you must keep them clean; otherwise, they will not be sufficient. Also, gutters clog thanks to leaves, dead birds, pests, and other debris easily, and failing to keep them clean means water damage and roof leaks.

Final Thoughts About Flat Roof Drainage Solutions

As you can see, the flat roof presents many
challenges when it comes to adequate water drainage, but you can find success
with one or a combination of the three types above. Keep in mind that to keep
your drainage system productive, you must maintain it regularly and ensure that
it’s cleaned to keep water and debris free flowing.


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