Modified bitumen roofing systems are a popular choice for flat and low-slope commercial roofs. Known for their durability and layered protection, these roofs can still experience wear and tear over time. Spotting issues early can help you avoid more costly repairs or even premature replacement.
At Jewett Roofing, we specialize in modified bitumen roof repair across Missouri and beyond. Here are some of the most common signs of damage we see—and how to fix them.
1. Blistering or Bubbling
If you see raised areas or bubbles on your bitumen roof, that’s a sign that moisture or air has become trapped between the layers. Left unchecked, these blisters can expand and lead to splits or cracks.
Fix: Depending on the extent, small blisters can often be cut out and patched. Larger or widespread areas may require partial re-roofing.
2. Cracks and Splits
Bitumen can become brittle over time, especially with temperature fluctuations. Cracks often occur at seams, flashing, or transitions.
Fix: Localized repairs with roofing cement or patch material can stop water intrusion. Regular inspections help catch these before they grow.
3. Ponding Water
Flat roofs are notorious for poor drainage. If water is sitting on the roof more than 48 hours after rainfall, it can lead to membrane deterioration.
Fix: Improve drainage by adding tapered insulation, repairing drains, or addressing low spots with additional layers.
4. Loose or Missing Granules
Granules on the surface protect the roof from UV damage. Over time, these can wear off or be displaced by foot traffic or storm events.
Fix: Minor loss is expected, but large bare spots should be sealed or coated to prevent accelerated aging.
5. Flashing Failures
Flashing around vents, HVAC units, or parapet walls is a common weak point. Separation or damage here can allow leaks into the building.
Fix: Reseal or replace flashing as needed. A professional inspection will determine whether isolated repair or full re-flashing is necessary.
Preventing Damage: Maintenance Matters
The best way to extend the life of your modified bitumen roof is with a proactive maintenance plan. Regular inspections and minor repairs can save thousands in emergency costs down the road.
At Jewett Roofing, we offer comprehensive maintenance services that catch issues early and keep your roof in peak condition year-round.
Need Bitumen Roof Repairs? We Can Help.
Whether it’s a small patch or a larger repair, our team knows bitumen roofing inside and out. We serve commercial clients throughout the Midwest with trusted expertise and proven solutions.
Think you might have damage? Contact us for a free roof assessment and customized repair plan.
