Flat roofs are some of the most common, practical, and efficient designs for commercial buildings. But, they can also collect water and debris, experience damage from foot traffic, and face other challenges, requiring regular maintenance and repairs. Flat roof repairs can range from small fixes to larger, more complicated processes.
In this complete guide, we'll break down how to spot issues early, what your flat roof repair options are, typical costs, and when it's time to call in the pros.
Contents
Common Warning Signs Your Flat Roof Needs Repair
The earlier you catch an issue, the better off you'll be when it comes to avoiding costly roof repairs. When you're performing your flat roof inspection, keep an eye out for these common signs.
1. Ponding Water
Standing water – also known as ponding water – that doesn't drain within 48 hours causes stress to the roofing system and leads to flat roof leaks. These issues are commonly caused by inadequate drainage, clogged gutters, or a sagging roof structure, and fixing them should be a priority.
2. Water Stains and Moisture Inside
Unfortunately, if you notice water stains on the ceiling or walls, you probably already have a leaking flat roof. These stains usually don't appear until long after the actual leak begins, and since the leak can travel along internal structures before it shows, it can be difficult to pinpoint the source of the damage.
3. Cracks, Blisters, and Holes
Extreme temperatures, thermal expansion, building movement, or aging materials can cause your flat roof membrane to crack or blister. These issues can expose the roofing material underneath, accelerating wear and increasing the risk of water damage.
4. Mold, Mildew, and Odors
Cracks, punctures, and separations in the existing roof surface can cause moisture to get trapped between the membrane and the insulation underneath. This can lead to wet insulation, mold growth, or that musty smell lingering around your building's roof.
5. Sagging or Soft Spots
Flat roofs with sagging areas, soft spots, or spongy textures underfoot often have damaged membrane sections or hidden water damage. These can lead to significant damage if not addressed.
What Causes Flat Roof Leaks?
A leaking flat roof doesn't always mean catastrophic damage, but catastrophic damage can start with a leaking flat roof. Here are some common causes:
- Aging roofing materials like worn-out membranes or degraded roof sealant
- Flashing around roof penetrations from HVAC units, vents, or skylights
- Poor drainage or blocked drains and scuppers, leading to ponding water and saturated roofing layers
- Lack of regular maintenance allows minor damage to worsen over time
- Improper installation, especially with hot tar or poorly applied roof coatings
Flat Roof Repair Options
If you notice leaks or damage, you may have some flat roof repair options, depending on the affected area, budget, and long-term goals.
1. Patching Minor Damage
For localized problems like small holes, using roofing cement and a compatible roof membrane patch may be more than enough to solve the problem. It's a cost-effective solution for small issues.
2. Roof Coatings
Applying a roof coating can extend the life of your aging flat roof by sealing small cracks and protecting it from UV rays and weather. Roof coatings can prevent leaks and provide a reflective surface, allowing your building to save money on energy costs.
3. Membrane Overlay
If your existing roof is mostly intact, but the damage is too scattered for small patches, a tear-off isn't your only solution. A new roofing membrane can be installed over the top of your existing membrane, saving you the cost, mess, and time. This is often used in commercial roofs as a reasonable cost alternative to full roof replacement.
4. Tear Off and Full Replacement
When your old roof has extensive damage or multiple layers already, removing the entire roof and installing a new roof may be the only permanent solution. This flat roof repair option is typically more expensive but offers long-term protection and updated roofing materials. You'll start fresh with a durable system, allowing you to make the most of your investment.
When to Call a Flat Roof Repair Professional
Flat roof repairs like sealing a small crack with roofing cement can be DIY-friendly, but many flat roofs require a professional. Call a flat roof specialist if:
- You can't locate the entry point of the leak
- There's significant water damage, wet insulation, or visible mold
- Your roof has multiple leaks or widespread cracking
- You need to apply roof coatings or replace the roof membrane
- Your commercial roof has structural concerns
A professional roofer can provide a detailed roof inspection, suggest permanent solutions, and help you choose the best roofing materials for your roof type.
How to Prevent Leaks and Extend the Life of Your Flat Roof
You might've guessed it, but regular maintenance is your best defense against roof leaks and unnecessary repairs. Follow these tips to keep your commercial roof in shape and avoid flat roof repairs:
- Inspect twice a year, especially after storms
- Clear drains and gutters to prevent ponding water
- Seal flashing and penetrations with proper roof sealant
- Reapply roof coatings as recommended
- Remove debris that could puncture or degrade the roofing membrane
Overall, flat roofs are reliable and cost-effective, but they certainly come with unique maintenance needs. Whether you're dealing with a minor leak, patching up holes, or exploring full flat roof repair options, stay proactive. You'll be able to save money and headaches in the long run.
If your flat roof is leaking or showing signs of damage, don't wait for a small issue to turn into a complete tear-off. Reach out to AAA Roofing for an inspection today. We'll assess the damage and recommend the necessary repairs, providing honest advice that you can trust.
