The Problem With Standing Water On Rubber Roofs
Rubber roofs, often called EPDM roofs, are a popular choice for flat and low-slope buildings because they’re durable, flexible, and cost-effective. But even a solid rubber roof can run into trouble if water starts pooling on the surface. Ponding water might not look like a big deal at first, but over time it can lead to serious… and expensive problems if it’s ignored.
Why Pooling Water Is a Problem
Rubber roofs are designed to move water toward drains, not hold it in place. When water sits on the roof for more than a day or two after rain, it starts to wear down the roofing membrane. Constant exposure to standing water can cause the rubber to age faster, soften, or develop blisters. This reduces the overall lifespan of the roof and increases the chances of failure long before it should need replacing.
Higher Risk of Leaks
One of the biggest dangers of ponding water is leaks. Even a small seam issue, puncture, or flashing problem can turn into a leak when water is constantly sitting.
The Dangers of Water Pooling on a Rubber Roof
The longer water stays in one spot, the more pressure it puts on those weak areas. Once water gets under the membrane, it can travel and spread, making the leak harder to find and more expensive to fix.
Added Weight and Structural Stress
Water is heavier than most people realize. Just one inch of standing water can add several pounds of weight per square foot. Over time, that extra load can cause the roof to sag, damage the roof deck, or stress the building’s structure. Older buildings or roofs with existing issues are especially at risk. In severe cases, ongoing ponding water can even lead to structural safety concerns.
Mold, Mildew, and Interior Damage
When water makes its way into the roof system, it can soak insulation and decking, creating the perfect environment for mold and mildew. This doesn’t just affect the roof—it can impact indoor air quality and lead to health concerns for occupants. Inside the building, water intrusion can damage ceilings, walls, electrical systems, and equipment, resulting in costly repairs and downtime.
What Causes Water to Pool?
Pooling water is usually caused by poor drainage, clogged drains or scuppers, building settlement, or improper installation. Even a well-installed rubber roof can develop low spots over time as the structure naturally shifts. That’s why regular roof inspections are so important, especially after heavy rain or snow.
Don’t Ignore the Warning Signs
The good news is that ponding water can often be corrected if it’s caught early. Clearing drains, repairing seams, and improving drainage with tapered insulation can make a big difference. Regular maintenance helps protect your investment and avoid unexpected repair bills.
If you’re dealing with standing water on a rubber roof in Northeast Pennsylvania, The Flat Roof Guys can help.
Phone: (570) 332-1223
Website: www.theflatroofguys.com
Email: theroofrepairguys@gmail.com
Addressing water pooling early can save you time, money, and a lot of headaches down the road.
