One of the most common questions we hear from commercial property owners and homeowners with low-slope roofs is, “Is it normal for water to sit on my rubber roof?” The answer is: sometimes.
EPDM rubber roofing systems are designed for low-slope applications, not steep drainage like shingle roofs. It’s common for a small amount of water to remain after a heavy rain. However, when water stays on the roof for more than 48 hours, it’s considered ponding water and could indicate a problem that deserves professional attention.
At The Flat Roof Guys, we inspect and repair EPDM rubber roofs throughout Northeastern Pennsylvania, helping building owners extend the life of their roofing systems before minor issues become expensive repairs.
What Causes Ponding Water?
Several factors can contribute to standing water on a flat roof, including:
- Building settlement over time
- Improper roof slope during installation
- Compressed or deteriorated insulation
- Clogged roof drains or scuppers
- Debris blocking water flow
- Aging roofing materials
While a properly installed EPDM roof can tolerate occasional standing water, persistent ponding often points to an underlying drainage issue.
Why Ponding Water Can Become a Problem
Standing water places additional weight on the roofing system and can accelerate wear over time.
Potential issues include:
- Faster deterioration of roof seams
- Increased chance of membrane damage
- Stress on flashing around penetrations
- Algae and organic growth
- Hidden leaks that develop beneath the membrane
- Interior water damage if left untreated
Even if your roof isn’t leaking today, ponding water can shorten the overall lifespan of your roofing investment.
How We Evaluate Ponding
At The Flat Roof Guys, we don’t simply look at where water is sitting. We determine why it’s happening.
During an inspection, we’ll examine:
- Drainage paths
- Roof drains and scuppers
- Insulation condition
- Roof seams
- Flashings
- Low areas in the roof structure
- Evidence of membrane movement or deterioration
Our goal is to identify the root cause and recommend the most cost-effective solution.
Can Ponding Be Fixed?
In many cases, yes.
Depending on the situation, solutions may include:
- Cleaning blocked drains
- Repairing damaged membrane areas
- Installing tapered insulation to improve drainage
- Correcting localized low spots
- Improving water flow around rooftop equipment
Every roof is different, which is why professional evaluation is important before deciding on repairs.
Protect Your Rubber Roof
Routine inspections can identify drainage issues before they lead to leaks or structural damage. If you’ve noticed standing water that remains days after rainfall, don’t ignore it.
The Flat Roof Guys specialize in EPDM rubber roof repair, maintenance, and replacement for residential and commercial properties throughout Northeastern Pennsylvania. Our experienced team can determine whether your ponding water is harmless or a sign that your roof needs attention.
Call The Flat Roof Guys today at (570) 332-1223 or email office@theroofrepairguys.com to schedule your professional roof inspection and keep your rubber roof performing at its best.
