Solved: Why Does Your Commercial Flat Roof Have Standing Water


Flat roofs are prone to standing water, especially in areas experiencing heavy rainfall. The water can pool on the flat surface, creating a wet environment, which can lead to mold growth and structural damage. Most homeowners don't know why their flat roof is collecting water. Understanding the cause of the standing water can help you protect your roof and prevent future issues.

The most common causes of standing water on commercial flat roofs are:

Blocked Gutters and Downspouts

Debris, such as leaves and twigs, can block water flow in gutters and downspouts. This can cause water to overflow onto your roof, where it can collect and pool on the flat surface.

After trimming nearby trees, ensure you clean your gutters and downspouts. You should also consider installing gutter guards to keep leaves from clogging the system.

If your gutters and downspouts block due to heavy snowfall, you should consider installing snow guards to keep the heavy snow from overflowing onto your roof.

Broken Roof Layers

Most flat roofs have several layers that protect your home from water damage. These layers include an underlayment, a waterproofing membrane, and a top coat. If any of these layers are missing or damaged, this can cause water to pool in certain areas as it cannot drain off properly.

If you identify broken or missing layers, you should hire a roofer to replace them before they cause further damage. The professional can help you source the ideal replacement materials and help you fix the problem. 

If you are dealing with dents like cracks or punctures, hire a professional to repair them. Timely repairs can prevent water infiltration and further damage your roof's layers.

Damaged Drainage System

A flat roof's drainage system can feature scuppers, drains, and overflow drains. These allow water to run off the roof surface while preventing pooling. If these components are damaged, they can cause standing water on your flat roof.

The slope of your roof also plays a role in water drainage. If the slope is too shallow, it might not effectively drain water off the roof surface. Depending on the situation, roofers can replace broken components or re-grade your roof's slope to improve water drainage.

Worn-Out Seam Sealant

Most flat roofs use seam sealant to create a water-resistant barrier along the seams. If this sealant starts to wear out, it can cause water infiltration and pooling on your flat roof. For maximum roof protection, hire a professional to inspect your roof's seam sealant regularly. They can replace any worn-out sealant before it causes damage to your roof.

By understanding the causes of standing water on commercial flat roofs, you can take steps to protect your home and ensure that no further damage occurs. 

Contact a local roofing company, such as Columbia Roofing Inc, to learn more. 

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The Life and Work of Roofers

Your home would not be a home without a roof. A good roof keeps the rain out, provides some insulation against sunlight, and does not easily become damaged when exposed to snow or ice. The roof was put in place by a roofer, who was probably one of the hardest-working people you'll ever meet. Who else can say they stand all day on a pitched surface and perform physical labor? Days as a roofer are long and hot, but we are all thankful for the work these professionals do. On this blog, you can learn more about roofers, their work, and their lives.

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