Flat Roof Drainage Options


Flat roofs are an alternative roofing style that provide a number of unique benefits to a structure, the least of which is an increase in outdoor living space. However, the main problem associated with flat roofs is drainage, as it is extremely easy for water and snow to pool on a flat surface. This can lead to water damage and mold and mildew growth, which can be serious problems for the building. Installing a proper drainage system on your flat roof can ensure that no damage occurs.

Scupper Drains

Scupper drains are L shaped drains that are placed on the edges of your flat roof, which allow for easy drainage from your roof into a downspout that will carry the water far away from the foundation of the structure. These are an extremely economical option, as scupper drains can be found at most hardware stores and are fairly inexpensive. However, scupper drains can become easily clogged and require a very slight slope in your roof to work properly, or else water will be able to pool in the middle of your roof. Most flat roofs are not actually completely flat.

Internal Drains

Sometimes also called interior drains, internal drains are installed in the middle of the roof. They are more expensive than scupper drains are because they require plumbing to be installed within the building. Water flows through the internal drains and into the plumbing, which will run out of a sidewall of the building. Internal drains are perfect for roofs that suffer from water pooling far away from the edges of the roof.


Gutter systems are not commonly used for flat roofs, but they can work in some instances. They require ditches or troughs to be installed in the roof to guide water to the edges, which can be expensive and unpractical for some flat roofs. However, these ditches can help reduce pooling across the entirety of the roof, making them more effective than scupper drains in some instances.


An environmentally friendly option would be to install planters with seedlings in areas that suffer from pooling. These planters will absorb any water that builds up during times of precipitation. However, this option is far from enough to remove all the water from your roof, and only works in the area that it is installed in. Therefore, installing planters on your roof should be used to enhance drainage systems already in place, and not as a primary drainage system itself.


7 October 2015

Understanding Roof Damage and The Need For Repairs

I was concerned that a recent hailstorm might have caused damage to my roof. While inspecting my roof, the roofing contractor noted cracked shingles and granule loss from the impact of the hailstones. I didn't want my roof to start leaking, so I immediately had the damaged shingles replaced. Hi, my name is Troy Blakely and in this blog, you'll find out about the various types of shingle damage. You'll also learn how to determine if you need to have your roof repaired or replaced. I didn't know this information until the roofing contractor explained it to me. Then I decided that I would help other people by spreading the word. A damaged or leaky roof can cause expensive damage to the inside of your home and that's why it's so important to address roof issues as quickly as possible.