Flat roofs are prone to standing water on the surface due to poor drainage, clogged gutters and downspouts, and broken or missing roof layers. Blocked sewers can cause stagnation on flat roofs as the water cannot drain off the roof to the sewer correctly.

Regularly scheduling inspections to identify damage or blockages is crucial. If there are any blocked pipes, a commercial roofing contractor can clear them as soon as possible to restore regular drainage and reduce the risk of long-term damage.

Keep reading to identify common reasons why your commercial flat roof may be collecting water. 

Blocked Gutters and Downspouts

The gutters and downspouts can become obstructed due to debris, such as leaves and twigs. Blocked downpipes can lead to water standing on the roof surface, creating puddles and eventually allowing the water to seep into your home.

After heavy rains, it is crucial to check the gutters and downspouts for blockages and clear away any collected debris. Pruning trees near your home during autumn and winter can also reduce leaves from entering your gutters and keep them clear. Also regularly cleaning these systems can help. 

Broken Roof Layers

Most flat roofs have several layers that protect the roof 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. 

Damaged Drainage System

A flat roof's drainage system can be a network of pipes, troughs, and proper slopes that helps water drain from the surface. If these systems are damaged, they will not carry away the water properly, and it will collect on the surface instead.

Other drainage damages, like cracked or blocked drains, can cause the same issue. If you suspect your drainage system is malfunctioning, contact a roofer to repair or replace it quickly. They will identify and fix any damaged or blocked pipes as soon as possible to reduce the risk of long-term damage. 

Standing water on the surface of your flat roof can lead to serious structural damage and leakage inside your home. By regularly inspecting the roof's drainage system, gutters, and downpipes, you can identify any problems early before they become an issue. Contact a professional commercial roofer if you suspect a problem with your commercial flat roof.