Rubber flat roofs have grown in popularity across the UK thanks to their affordability, flexibility, and long lifespan. Especially when made from EPDM (ethylene propylene diene terpolymer), these roofs offer excellent weather resistance and are commonly used on extensions, garages, porches, and commercial buildings. But like any roofing material, rubber flat roofs aren’t entirely free from issues.
At Energy Windows, we believe it’s important for homeowners to understand both the strengths and the potential challenges of their roofing systems. If you have a rubber flat roof—or are considering one—knowing what problems might arise and how to prevent them can save you time, stress, and money down the line.
Let’s explore the five most common problems with rubber flat roofs and the best ways to keep your roof performing well for years.
1. Ponding Water
Flat roofs, by their very design, don’t shed water as easily as pitched roofs. If the roof hasn’t been installed with proper drainage or a slight gradient, rainwater can begin to collect and form puddles—also known as ponding. Over time, standing water puts stress on the membrane, increases the risk of leaks, and can lead to sagging or structural damage.
How to prevent it:
Make sure your rubber flat roof is installed by a professional who understands how to achieve a subtle pitch for drainage. Regularly check your gutters and downspouts to ensure they’re not blocked, especially after heavy rain or during autumn when leaves accumulate. If you already notice water pooling, it’s worth having a roofer inspect the slope and drainage system.
2. Shrinking or Pulling Away at the Edges
One of the less obvious issues that can happen over time is rubber shrinkage. As EPDM rubber ages, it can contract slightly. When this happens, it may begin to pull away from the edges, flashing, or seams. This can lead to gaps that allow water to seep in, increasing the risk of leaks and damaging the underlying structure.
How to prevent it:
Proper installation is key. At Energy Windows, we ensure that the rubber membrane is installed with enough allowance to accommodate natural movement and shrinkage. If your roof is older, keep an eye on the seams and edges. If you see signs of pulling or lifting, act early—re-sealing small areas is far cheaper than replacing the entire roof.
3. Punctures and Tears
Rubber is durable, but it’s not immune to sharp objects, falling branches, or even heavy foot traffic. If your roof is used as a walkway or has frequent maintenance access (like around air conditioning units), punctures and tears can occur. Even a small tear can compromise the waterproofing of the entire system.
How to prevent it:
Avoid unnecessary foot traffic on the roof. If access is needed, use protective walk pads to spread the load and reduce pressure on the membrane. Trim nearby tree branches that could fall during storms or rub against the surface in the wind. If you do notice damage, have it patched professionally before water has a chance to get in.
4. Poor Installation
One of the most common sources of issues with rubber flat roofs is poor workmanship. Whether it’s wrinkles in the membrane, poorly sealed seams, or incorrect flashing, a bad installation can cause leaks and premature ageing. Unfortunately, not all installers have the same standards or experience.
How to prevent it:
Always choose a reputable roofing company with experience in rubber flat roof installation. At Energy Windows, we’ve worked on countless flat roof systems across Stoke on Trent and surrounding areas, ensuring each project is handled with attention to detail and quality materials. A properly installed roof won’t just last longer—it will save you the headache of ongoing repairs.
5. UV Damage Over Time
Although EPDM rubber is resistant to UV rays, constant exposure over many years can lead to gradual degradation. This usually shows up as brittleness or surface cracking, especially if the roof is older or hasn’t been maintained. Once the membrane starts to break down, it’s more vulnerable to water penetration.
How to prevent it:
Fortunately, UV damage is a long-term issue and usually only affects roofs that are 15–20 years old. Regular inspections help you catch the early signs before it becomes a major problem. In some cases, applying a reflective coating can help protect the rubber and extend its lifespan even further.
Final Thoughts
Rubber flat roofs are a smart, cost-effective choice for many homes and extensions, offering a sleek, modern look along with strong weather resistance. Like any part of your home, though, they benefit from proper installation and regular care.
By understanding the most common problems—ponding water, shrinkage, punctures, poor installation, and long-term UV exposure—you can take practical steps to avoid expensive repairs in the future.
At Energy Windows, we don’t just install high-quality rubber flat roofs—we also provide expert guidance on maintaining them for the long haul. Whether you’re building a new extension, replacing an old roof, or simply want peace of mind about your current one, we’re here to help with professional, honest advice and service you can trust.
If you’re based in or around Stoke on Trent and have questions about rubber flat roofs, contact us today. We’ll be happy to help you make an informed decision about your home.
