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How Do Flat Roofs Handle Rain?

Feb 13, 2024

Flat roofs are a popular choice for commercial and residential buildings due to their lower cost than pitched roof designs. However, flat roofs have unique considerations when it comes to handling rainwater. To maintain the integrity of your roof, you need to understand how interior drains, gutters, and scuppers work together to keep your flat roof safe from water damage. 


Interior Drains 


Interior drains are the primary way that flat roofs handle water. They are placed at various points along the roof’s surface with a drain pipe leading to the ground. This allows water to be directed away from the building and prevents pooling on the roof. The drains also help ensure that any standing water is quickly evacuated, keeping your roof in top condition. 


Gutters 


Gutters can also be used to help control the flow of rainwater on flat roofs. They are placed along the edge of the roof and collect water, channeling it away from the building’s foundation. This helps prevent flooding and ensures that no water is collected around sensitive areas like windows and doors. 


Scuppers 


Scuppers are openings along the edge of the flat roof that allow water to drain away from the building. They can be used in combination with gutters for a more comprehensive approach to rainwater management, allowing water to quickly flow away from your roof rather than pooling up or being collected by gutters. 


How Are Flat Roofs Waterproof? 


In addition to the drainage solutions discussed above, flat roofs are also protected from water damage by a layer of waterproof material. This layer is typically made of rubberized asphalt or modified bitumen and helps deflect any standing water away from your roof’s surface. 


By understanding how interior drains, gutters, and scuppers work together with a waterproof material, you can keep your flat roof safe from water damage. With the right solutions in place, you can ensure that your roof remains protected even during storms and other intense weather conditions. 


Flat Roof Inspection and Repair Services


ACR1 Commercial Roofing provides comprehensive flat roof inspection and repair services, helping you stay on top of your roof’s maintenance needs. Our experienced team can help identify any potential problems and address them before they become more costly repairs. Whether you need a total roof replacement or minor leak repair, we’re here to ensure your flat roof is in top condition. Contact us today to learn more! 

Author: Floyd Mason

Born and raised in farming in Iowa

Worked in and around construction since 1977

BS in Corporate Finance and Financial & Estate Planning from Brigham Young University. Involved in Boy Scouts of America for more than 35 years, Scoutmaster 15 years Estimator, Project Manager, Sales Representative, Crew Leader, Laborer, Territory Manager, District Manager, Regional Manager, National Sales Manager,

ACR1.COM Sales & Marketing Manager since 2013.

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Flat roofs can be a great choice for buildings due to their affordability and durability. However, if not done correctly, flat roofs are prone to water damage. Proper drainage is essential for the longevity of a flat roof, and selecting the correct drainage system is critical. Here we will discuss three common flat roof drainage systems - gutters, interior drains, and scuppers - as well as their pros and cons. Gutters Gutters are the most common form of flat roof drainage because they are low-cost and efficient when it comes to redirecting water off the roof. Gutters should be installed at a certain angle (approximately 1/4” per foot) to ensure proper water drainage. Gutters also need to be maintained over the years, as debris and leaves from storms or rain water can clog them up and create standing water. Pros: Low-cost installation and maintenance Easy to install Can direct water away from the foundation of the building Cons: Prone to clogging Requires periodic maintenance and cleaning Overflow from rain storms can cause damage to surrounding areas Interior Drains Interior drains are often seen as the higher-cost alternative to gutters. They are installed directly into the flat roof’s membrane and include a network of pipes that drain water off the roof into a downspout. Pros: Low maintenance More reliable than gutters in terms of preventing roofing damage Can be adjusted to fit any size of flat roof Cons: Expensive installation and maintenance costs compared to gutters May require frequent adjustments depending on the environment surrounding the building Can be difficult to install if the roof does not have the right slope Scuppers Scuppers are metal or plastic openings that allow water to drain off flat roofs. They generally come in square or rectangular shapes and are installed along the perimeter of a roof. The size and shape of scuppers should be adjusted accordingly in order to prevent water from overflowing onto the sides of a building. Pros: Easy and cost-effective installation Low maintenance costs compared to gutters or interior drains Can be adjusted to fit any size of flat roof Cons: Prone to clogging due to debris and leaves Overflow from rainstorms can cause damage to surrounding areas Can be difficult to install correctly if the roof does not have the right slope When it comes to selecting the best drainage system for your flat roof, there are a few things to consider. Gutters, interior drains, and scuppers all offer their own advantages and disadvantages. It is important to select the right drainage system for your needs in order to ensure the longevity of your roof and protect it from water damage. Flat Roof Repair and Inspection Services If you are looking to repair or replace your flat roof, make sure to contact a certified roofing professional who can assess your current roof and provide the best solution for your needs. At ACR1 Commercial Roofing, we specialize in flat roof repair and installation . Our team of certified professionals has years of experience working with flat roofs, so you can be sure that your roof is in safe hands. Contact us today to learn more!
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