Your commercial roof is your building’s first line of defense against the elements — but when it starts to fail, the damage can spread quickly and become costly. Knowing the early warning signs can help you act before a small issue turns into a major repair or even a full replacement.
At Holthaus Roofing, we help building owners and property managers spot problems early and resolve them before they escalate.
Here are the most common signs your commercial roof may need repairs.
1. Ponding Water
Flat or low-slope commercial roofs often struggle with drainage. If you notice water pooling in the same areas after every rain, that’s a red flag. Ponding water can cause membrane breakdown, leaks, and even structural sagging over time.
For more on drainage issues, see the NRCA guidelines on low-slope roofing.
2. Visible Leaks or Interior Water Stains
Brown stains on ceilings, walls, or inside drop tiles typically point to a roof leak. Even small leaks can lead to mold, rot, and damage to insulation and electrical systems. Never ignore water intrusion, even if it seems minor.
Schedule a professional inspection to pinpoint the source of the problem.
3. Damaged or Lifting Flashing
Flashing seals the edges and transitions of your roof — around HVAC units, vents, and parapet walls. If flashing is loose, bent, or missing, water can easily seep underneath the membrane. This is one of the most common causes of commercial roof failure.
4. Membrane Cracks, Blisters, or Tears
Whether your roof is Duro-Last®, TPO, EPDM, or another membrane system, look for surface damage. Blisters (air pockets), open seams, or visible tears expose the roof to UV rays and moisture, accelerating deterioration.
For more on membrane problems, the National Roofing Contractors Association (NRCA) provides a helpful overview.
5. Increased Energy Bills
Have your heating or cooling costs suddenly jumped? A compromised roof system can allow heat or cold air to escape, forcing your HVAC system to work harder. Damage to reflective or insulated surfaces may be to blame.
6. Sagging Areas or Uneven Surface
If the roof deck feels soft underfoot or appears uneven from a distance, structural damage could be developing. This could be caused by water saturation or a failed drainage system. It’s important to have these areas assessed immediately.
7. Aging Roof Past Warranty
If your commercial roof is over 15–20 years old and hasn’t had regular inspections, it’s time to have it professionally evaluated. Materials wear out, seams weaken, and underlying damage becomes more likely with age.
Check if your roofing system (especially if it’s Duro-Last®) is still within its warranty period at duro-last.com.
Act Early. Avoid Costly Repairs.
Ignoring the early signs of commercial roof damage can lead to interior damage, disrupted operations, and expensive emergency repairs. At Holthaus Roofing, our team of experts can assess your roof, make necessary repairs, and help extend the life of your roofing system.
Don’t Wait for a Leak — Get Peace of Mind
Need a roof inspection or repair quote? Contact Holthaus Roofing today to keep your business protected.