10 Questions to Ask When Checking Your Commercial Roof’s Health

1. Are There Any Leaks or Signs of Water Inside?

The first place you should check isn’t always the roof itself, it’s the inside of your building. Walk through the top floor and look up at the ceilings and walls. Any signs of water should get your attention right away. Common things to look for include:

• Brown or yellow stains on ceiling tiles
  
• Peeling paint or sagging drywall
  
• Dripping water or puddles after a storm
  
• A musty or moldy smell
  

Why does this matter? Because even a small leak means water has made it through your roofing system. It could be soaking wood framing, insulation, wiring, or drywall. Over time, this causes rot, mold, and even fire hazards from electrical damage. Catching a leak early lets you fix it while it’s still a small, inexpensive issue – instead of a major repair or shutdown later.

2. Is the Roof Surface Sagging or Feeling Soft?

Next, head up to the roof if it’s safe. Look at the surface  is it straight and firm? Or are there dips, low spots, or soft areas that feel squishy under your feet?

Sagging often means water has been sitting in one area too long, soaking into the roof layers and weakening the materials below. It can also mean the building structure is stressed or failing. If the roof gives under pressure or feels spongy, that’s a serious sign that something is wrong underneath usually rotted decking or damaged joists.

The danger here is that sagging can lead to collapse, especially if it rains again or if heavy equipment like HVAC units is nearby. Fixing it early might involve replacing some decking or reinforcing the framing, but it’s far better than dealing with a full roof failure.

3. Are There Cracks, Rips, or Holes in the Roof?

Now check the surface closely. No matter the roofing material  membrane, metal, asphalt, or tar damage shows up as cracks, splits, or holes. These are entry points for water and pests.

Look for:

• Tears from dropped tools or dragged equipment
  
• Punctures from hail or sharp debris
  
• Cracked seams or peeling edges
  
• Rusted-through spots on metal roofs
  

A small crack might not cause a problem in dry weather, but after one good rain, it could let water seep in and cause damage that spreads. These kinds of flaws can usually be patched, sealed, or repaired fairly quickly. But if you ignore them, they’ll only grow and eventually lead to much larger repairs or a full roof replacement.

4. Do You See Bubbles or Blisters in the Roofing?

If your roof has any kind of membrane (like TPO, EPDM, or built-up layers), watch for bubbles, blisters, or raised spots. These bumps form when moisture or air gets trapped under the surface. The hot sun causes the trapped material to expand, lifting the top layer into a blister.

At first, they might just look ugly. But if a blister bursts or peels open, it can create a perfect hole for rain to get in. Even without bursting, the roofing material in that area is weaker and more likely to fail.

So ask:

• Are these blisters growing?
  
• Are they near seams or drains where water collects?
  

If you notice a lot of them, it might mean the roof wasn’t installed properly, or that it’s reaching the end of its useful life. Don’t wait for them to pop. A roofing contractor can safely cut out and repair blistered areas before they lead to a leak.

5. Are Any Materials Loose, Missing, or Out of Place?

After storms or strong winds, it’s common for parts of a roof to get dislodged or blown off. That includes shingles, tiles, sections of membrane, or even metal flashing.

Even if pieces haven’t fallen off completely, they may have lifted or curled at the edges. That’s enough to allow wind-driven rain to sneak in underneath. This is especially risky around roof edges and penetrations like vents, skylights, and HVAC bases.

Ask yourself:

• Are all roof materials still flat and secure?
  
• Do any seams look lifted or exposed?
  
• Are fasteners missing or loose?
  

If anything looks like it’s shifted out of place, it needs attention. Re-securing or replacing a piece of roofing now can prevent major water intrusion later. It’s a simple fix that makes a big difference.

6. Is Water Pooling After Rainfall?

After a rain, your roof should dry off fairly quickly. If you walk on the roof and see puddles that linger for more than 48 hours, that’s called ponding,  and it’s a sign your drainage system isn’t working right.

Ponding water can:

• Weaken roofing materials
  
• Add heavy weight to the roof structure
  
• Attract bugs and create algae or plant growth
  
• Cause sagging, which leads to more ponding
  

Often, ponding means there’s a blocked drain or a low spot where the slope isn’t right. In some cases, the solution is as easy as cleaning out a clogged scupper or drain. Other times, it might mean adding a tapered section to help the water flow. Either way, ignoring it will eventually lead to leaks and structural stress.

7. Are the Gutters, Drains, and Downspouts Working?

A healthy roof needs a clear path for water to leave. Blocked drains or overflowing gutters can undo even the best roofing system. That’s why this question is critical: are your roof’s drainage points clean, clear, and working?

Signs of drainage trouble:

• Water flowing over gutter edges
  
• Leaves or trash clogging the drains
  
• Gutters pulling away from the building
  
• Water stains on walls under downspouts
  

Gutters and scuppers should be inspected and cleared out at least a couple of times a year – more often if your building is near trees. Keeping them clean ensures rain moves off the roof quickly, preventing standing water and protecting your walls and foundation too.

8. Are Flashings and Sealants Still Sealed Tight?

Flashings are protective covers installed where different surfaces meet like at skylights, vents, chimneys, and edges. They’re designed to prevent water from sneaking into these joints.

But over time, flashings can:

• Rust or corrode
  
• Pull away in the wind
  
• Crack from sun exposure
  
• Lose their seal as the caulk dries and shrinks
  

These are the first places most roofers check for leaks and for good reason. A tiny gap here can cause major water damage inside. That’s why you should check them regularly. Run your eyes (or hands, with care) along the edges and junctions. If anything is loose, bent, or cracked, reseal or replace it.

Keeping flashings sealed and secure helps maintain a waterproof roof system and protects those vulnerable connection points.

9. How Old Is the Roof, and Has It Been Maintained?

Your roof has a lifespan. Most commercial roofs last between 20 to 30 years, depending on material and maintenance. If you’re unsure how old yours is  or whether it’s ever been serviced that’s a red flag.

Important things to track:

• Installation date
  
• Dates of past inspections or repairs
  
• Warranty coverage, if still active
  

A roof that’s been ignored for years is much more likely to have hidden issues. But one that’s had regular inspections and small repairs over time will likely last longer and perform better. If your roof is past its prime, it’s smart to budget for either major repairs or eventual replacement before it becomes urgent.

10. Is the Roof Free of Debris and Clean?

Leaves, dirt, trash, and even nests can build up on a roof surprisingly fast. While it may seem minor, debris can cause real problems.

It can:

• Trap moisture against the roof
  
• Block drains and gutters
  
• Promote mold or algae growth
  
• Attract birds, insects, or rodents
  

A clean roof is easier to inspect, less likely to leak, and performs better in all kinds of weather. It’s one of the simplest things you can do to extend the life of your commercial roof. Schedule regular cleanings, especially after storms or seasonal leaf drops. Even once a quarter is better than nothing.