Ten signs your commercial roof needs attention now
1. Standing water more than 48 hours after rain
Ponding is a leading cause of premature membrane failure on low slope roofs. Water adds weight, accelerates UV breakdown, and freezes inside seams during Indiana winters. If you can see standing water two days after the last rain, drainage needs work.
2. Bubbles, blisters, or pillows in the membrane
Trapped air or moisture under the membrane. Small blisters can be monitored. Anything larger than a basketball, or anything that's growing, needs repair before it ruptures.
3. Visible seam separation
On EPDM, TPO, and modified bitumen roofs, the seams are where leaks start. Lifted edges, fishmouths, or visible gaps between membrane sheets are urgent.
4. Cracking, splitting, or alligatoring
EPDM and modified bitumen lose elasticity as they age. Surface cracking is a sign the membrane is reaching the end of its useful life and may need restoration or replacement, not just patching.
5. Rusted or backed-out fasteners on metal roofs
Standing seam and screw-down metal roofs depend on tight fasteners with intact gaskets. Rust streaks running down panels, or screws sitting proud of the metal, mean water is getting in. We see this constantly on aging metal buildings around Elkhart and Goshen.
6. Damaged or missing flashings
Flashings around HVAC curbs, parapet walls, pipe penetrations, and skylights are usually the first thing to fail. Inspect every penetration on every visit.
7. Clogged or overflowing drains and gutters
A blocked drain can turn a flat roof into a swimming pool. We've inspected Indiana buildings where a single golf-ball-sized clog cost the owner a $40,000 deck repair.
8. Granule loss on modified bitumen
Granules protect the asphalt layer underneath from UV. Patches of bare black asphalt mean accelerated aging from that point on.
9. Interior staining, even if it dries out
Water doesn't always show up where it gets in. By the time you see a stain on a ceiling tile, water has been traveling through insulation and across the deck for some time. Investigate immediately.
10. The roof is past its rated service life
If you have a 25-year-old EPDM roof and you've never had a real inspection, you're running on borrowed time. Even when nothing visible has failed, the underlying systems may be one heavy storm away from a major loss.
What to do if you spot one of these signs
- Document with photos and the date you noticed it.
- Don't put a tarp or roofing tar on it yourself. Both can void warranties and complicate proper repair.
- Pull your most recent roof inspection report and any warranty paperwork.
- Call a commercial roofing contractor for an evaluation, not a salesperson selling a new roof.
Why Indiana weather makes this worse
Our freeze-thaw cycles are particularly hard on commercial roofs. A pinhole leak that would be a minor annoyance in Arizona expands and contracts every night between October and April here. Small membrane defects that go a full Indiana winter without repair almost always come out of spring much worse than they went in.
The cheapest path: catch it early
Twice-yearly inspections, typically spring and fall, catch most of these issues before they become emergencies. Owners on a maintenance program spend a small fraction of what they would on reactive repairs and roof replacements.