For commercial and residential buildings alike, flat roofs offer a wide range of benefits, from affordability to low-effort maintenance. However, they face one significant problem in that water can form stagnant pools on their surfaces, later leading to a wide range of structural issues. In the following guide, find out more about the risks this issue presents and what you can do to resolve it.

Why Is Pooling Water on Flat Roofs a Problem?

The problems posed by ponding water vary depending on the season. In the winter, stagnant water can freeze, forcing roofing materials apart and allowing water to penetrate the underlayment. In the summer, it can form a breeding ground for algae, bacteria, fungi, and insects like mosquitoes.

However, standing water can also be an indication of other underlying problems. One of the most common is an inadequate, damaged, or blocked drainage system. Alternatively, the roof itself or the gutters and downspouts may have been improperly designed or installed, causing water to collect in depressed areas after periods of rain. A similar issue can occur when roof insulation becomes compressed or saturated, causing it to sink and form pits across the roof’s surface.

How Can You Prevent Puddling?

The simplest way to prevent pools of water from forming is to regularly flush your drains and repair or upgrade them as needed to allow rainfall to flow away quickly. It’s also wise to clean your gutters at least twice a year to ensure they’re free of obstructions which can prevent water from draining correctly.

If the issue is caused by low spots, it may be necessary to have a roofing contractor restore the roof’s slight grade to enable drainage. More complicated issues such as an insufficient grade or sagging or settling may make roof replacement a necessity, as it might not be possible or practical to repair them.

Alternatively, it may be possible to resolve issues with ponding by replacing the waterproof membrane underlying the roof or compressed insulation or by installing roof crickets. These are ridged structures that divert rainfall and meltwater from vents, chimneys, and other fixtures.

When these or other issues affect your roofing, you can turn to Mapco Exteriors in St. Peters, MO, for prompt, professional assistance. Backed by nearly 30 years of experience and an A+ rating from the Better Business Bureau®, they have the training and resources needed to restore flat roofs to their intended configuration and eliminate hazardous ponding problems. Call (636) 626-2726 to schedule an inspection, and visit them online to learn more about their services.