Why Does a Commercial Flat Roof Fail? Common Reasons & What You Can Do

"You need a new roof."

Not the five favorite words of any property owner, right?

We understand why no one wants to hear these words. Let’s face it, commercial roof installation is expensive. The upfront cost, the price per square foot, and a large percentage of your maintenance budget. Any way you slice it, a new commercial roof is one of the most expensive repairs on a building.

The good news? We handle hundreds of repair calls for flat roofs every year, and most are repairs, not replacements. But there’s also bad news: The longer you wait to address a commercial roof maintenance issue, the more likely it is that your roof will fail and require a full replacement.

At All Elements, we want your roof to last as long as possible, and the best way to do that is by getting regular inspections and fixing small issues before they become bigger problems through our Roof Care Advantage Program (RCAP). A repair for a few hundred dollars now might allow you to replace the roof based on thoughtful planning, not a catastrophe.

Knowing when to call is the key. With that in mind, let’s look at a few of the most common reasons commercial flat roofs fail so you can spot issues as early as possible.

Design & Structural Issues

When your building was constructed, it was (hopefully) designed to account for proper drainage. Over time, roofs can begin to sag due to age or rooftop equipment affecting the slope. This leads to ponding water that doesn’t drain properly. Aside from being an aesthetic issue, it can lead to commercial roof leaks and other issues that put your roofing membrane and building at risk.

When water stops draining properly, you’ll need to fix the underlying cause. This can include:

• Inspecting the joists or trusses for structural damage.
• Leveling targeted areas to prevent ponding.
• Clearing blocked drains and downspouts.
• Adding more drains to create a clear path for water.

Material & Installation Problems

Everyone in roofing has seen a “good” roof system fail prematurely, and we’ve all seen roofs last longer than their expected lifespan.

When a flat roof uses an unsuitable material, or it was installed poorly to begin with, premature failure is bound to happen. If a material is at the end of its lifespan and can’t be repaired, you may need to budget for a full replacement using roofing materials better suited to the Upper Midwest. However, depending on its condition, targeted repairs can extend your roof's lifespan before replacement.

Environmental Conditions & Weather

In Minnesota, we have to deal with a lot of extreme weather that puts roofing to the test.

• UV degradation breaks down membranes, causing shrinkage, blistering, and brittleness.
• Wind can uplift membranes if it gets into cracks and seams, causing widespread damage.
• Thermal cycling causes repeated expansion and contraction, putting stress on seams.
• Freeze-thaw cycles and ice dams increase the risk of leaks and damage to structural integrity.

While you can’t do anything about the weather, staying on top of ice dam removal and seasonal inspections can extend the lifespan of your roof.

Our Roof Care Advantage Program (RCAP) is a great way to protect your commercial flat roof.  Conducted twice a year, this program includes:

• Comprehensive inspections of your entire roofing system.
• Debris removal to prevent clogged drains and damage to roofing membranes.
• Complete reporting on your roof’s condition so you can make informed repair decisions rather than reacting to damage after it occurs.

Accidental Damage & Misuse

One of the best ways to avoid a commercial flat roof repair is to be careful about foot traffic and equipment placement. While you can’t always avoid walking on your roof, you can create designated pathways that distribute weight as evenly as possible and prevent damaging the membrane.

Limiting foot traffic helps, but maintenance staff and equipment servicing technicians will inevitably need to go on your roof from time to time. Make sure installers and service techs follow procedures for protecting the membrane when mounting equipment and moving heavy items across the roof.

Component Failures

Flat roofing systems are more than just membranes. They rely on multiple components working together. If any one of these smaller parts fails, it can quickly lead to bigger problems. Pay attention to damage such as:

• Clogged drains and scuppers.
• Dented, bent, or separated flashing.
• Loose, missing, or corroded fasteners.
• Damaged or deteriorated roof penetrations (vents, pipes, and HVAC systems).
• Cracked or missing caulk around joints.

Neglect & Aging

Even a flat roof is built well, it can fail early if you regularly skip seasonal inspections and maintenance. But regardless of your upkeep schedule, all materials have a finite lifespan. To avoid unexpected expenses, make sure you understand the expected life of your commercial roof so you can budget for replacements ahead of time.

You may be wondering: Is the scupper flashing good? Is that seam opening up? Are the flashings solid? Why does the brick around the scupper look wet? Not only can All Elements tell you what you are looking at, but we can fix it.

How long should your roof last? That’s difficult to answer because of all the variables that affect its lifespan. Yep, we are in the Northland, and it's a brutal climate, so maintenance inspections twice per year are a good practice.

Protect Your Commercial Roof with All Elements

Just like you need to change the oil or rotate the tires on your vehicle, roofs need to be checked out regularly so small problems don't turn into big disasters.

Bottom line: Give All Elements a call at the first sign of a problem. We come ready to tackle all kinds of roofs. Have you noticed our service vehicles look like they are packing for an expedition? Shovels (for rock or snow), pumps, squeegees, half a dozen different cleaners, asphalt, rubber, TPO & PVC membranes are standard stock items alongside saws, drills, hand tools, fall protection gear, garbage bags, and rags.

Your best insurance against a premature roof replacement is maintenance and early repair. Bring us out for minor visits, and you can delay that one big visit you dread.

Fill out our contact form or call us at 763-314-0234 (Metro Location) or 218-561-2001 (North Location).