Commercial Roof Warning Signs Monona Owners Shouldn’t Ignore

Quick reference: sign, likely cause, urgency

Warning signs you can spot without getting on the roof

You do not need a ladder to catch most problems. You need to walk the building with your head up.

Ceiling staining. Brown rings on tiles, bubbling paint, a rusty streak down a wall near a column. Water rarely drips straight down on a low-slope roof. It runs along metal deck flutes or a beam and appears 20 feet from the actual breach, so the stain is a clue, not an answer.

A new musty smell. The most ignored sign there is. Wet roof insulation does not dry out under a membrane, so it sits and grows mold quietly. If a space smells different than it did last year and the HVAC checks out, look up.

Rust on ceiling grid, fasteners or deck. Rust in one area means repeat moisture, not a one-time spill.

Water at the base of interior walls or columns. Water tracking down structural steel gets misdiagnosed as plumbing or foundation trouble constantly.

Two misconceptions worth killing. Flat roofs do not "always leak": a properly installed, maintained single-ply system should run 20-30 years for EPDM and 20-25 for TPO. And no visible drip does not mean the roof is fine, because insulation holds a startling amount of water before anything reaches a ceiling tile.

What to look for on the roof itself

Ponding water that does not drain within 48 hours

Low-slope roofs shed water slowly by design. Water still standing two days after rain points to a clogged drain, a compressed insulation low spot, or deck deflection. Standing water weighs roughly 5 pounds per square foot per inch of depth, ages membrane faster, and in Dane County it freezes and thaws repeatedly from November into March, which is brutal on seams.

Membrane blistering, cracking or seam separation

• TPO: seam separation, shrink-back at penetrations, stress cracks where membrane bridges a curb.
• EPDM: shrinkage pulling at parapet corners, lifting seams, softening in ponded areas.
• Modified bitumen: surface alligatoring, open laps, granule loss on the cap sheet.

Blisters mean trapped moisture or air between layers. Spongy underfoot means the insulation is already wet.

Flashing and penetrations

This is where most leaks start, and it is not close. Check parapet walls, coping joints, HVAC curbs, exhaust vents, drains, skylights, and every pipe or conduit. Look for rusted or loose metal, sealant that has pulled open, and dried, cracked pitch pans.

Buildings along the Monona Drive and Broadway corridor sit fairly open to the Lake Monona wind fetch, and that wind works on edge metal and parapet counterflashing harder than it works on the field of the roof.

Drains, scuppers and debris

Monona collects cottonwood fluff and maple seeds in late May and June, then leaves in October and November. Those are your two mandatory drain-clearing windows. One clogged drain can pond an entire bay.

When it is a structural engineer's problem, not a roofer's

Stop and call a licensed structural engineer, not a roofing contractor, if you see any of these:

• Visible sag or deflection in the deck or ceiling, especially over a long clear span
• Spongy or bouncing decking across a wide area rather than a small soft spot
• Ponding showing up in a location where water never used to stand
• New cracks in parapet masonry, bowed joists, or a column or bearing wall that looks off
• Any of the above after a heavy snow or an ice-then-rain event

In those cases, keep people and inventory out of the area under it and get an engineer's read first. A roofer can tell you the membrane is failing. Only an engineer can tell you the structure is still safe to load. We will say so plainly if that is what we find.

Two failure patterns we see on buildings this age

These are patterns, not case studies of specific buildings. The low-slope stock across Monona is largely 1980s through 2000s single-ply and modified bitumen, and these two stories repeat.

Shrunken EPDM at an inside parapet corner. Decades of shrinkage pull the flashing just enough to open a gap invisible from the ground. The stain shows up in a back stockroom 15 feet from the breach. If core cuts come back dry, the fix is a corner flashing rebuild with new termination bar and target patches, typically in the low-to-mid four figures, and the roof gets several more years.

An unreported service puncture on TPO. A dropped tool near an HVAC curb in spring, nobody tells anyone. By fall, cores show wet insulation across a couple thousand square feet. A patch would have ended it for a few hundred to a few thousand dollars. Instead it becomes a sectional tear-off with insulation and membrane replacement, well into five figures.

What to do right now if you have an active leak

1. Document it. Photos of the stain and any drip, with the date. Note the location relative to columns or grid lines, and what the weather was doing.
2. Protect the interior. Buckets, plastic over inventory or equipment, move product out from under the drip. Cut power to any fixture taking water.
3. Clear what you can reach from the ground. Downspout outlets, scupper discharge points, debris piled against the building. Do not go up on a low-slope roof yourself to clear a drain. That is fall-protection work, and in winter it is also a puncture risk to the membrane. Send a crew, not your facilities manager.
4. Call for emergency tarping if the membrane is open, seams are lifting, or wind pulled edge metal off mid-storm. We run 24-hour emergency storm response for exactly that.
5. Do not plug a drain, and do not rely on a tube of caulk. Blocking drainage ponds water somewhere else, and caulk-only "fixes" on flashing fail in one freeze-thaw season while hiding the real detail failure from the next person who looks.

Winter on a flat roof: snow, drifting and ice at the drains

This is the number one fear for flat-roof owners here, and mostly for the right reasons.

Drifting is the risk, not average snowfall. Fresh light snow runs roughly 3-5 pounds per square foot per foot of depth. Wet, settled or rain-soaked snow can run 15-20 pounds or more per foot. Wind piles it against parapets, behind rooftop units, in valleys between roof levels, and on the lee side of a taller adjacent building. A roof can be handling the field load fine while a drift behind the parapet is three times deeper than anything on your weather report.

Ice at scuppers and drains is what turns snow into standing water. When a thaw or a rain-on-snow event hits and the drains are iced shut, meltwater has nowhere to go. Now you have ponding weight on top of snow weight, and it finds every marginal seam. Late fall drain clearing is cheap insurance for exactly this.

When to have snow removed. Not routinely. Do it when drifts are deep, when drains and scuppers are iced and warm weather or rain is coming, when you see any deflection, or when you already have an active leak. Use a crew with a fall-protection plan, plastic tools only, and leave a protective layer of snow on the membrane. Metal shovels and ice chippers cut single-ply.

Can a repair be done in January? A temporary, water-tight repair usually yes: cold-weather compatible patches, mechanically fastened target patches, approved wet-patch materials on modified bitumen. A permanent one often no. Adhesives, hot-applied systems and coatings need dry decks and minimum application temperatures. So the honest plan in deep winter is stabilize now, schedule the real work for spring, and document everything in between.

Costs, service life and capital planning

Ranges below reflect this market and move with material pricing. They are not quotes.

Repairs: localized seam, patch or puncture repair $600-$3,500. Multi-penetration or parapet flashing rebuild $3,500-$12,000. Sectional tear-off with insulation replacement is priced by square foot.

Replacement, installed:

What drives your number up: wet insulation and deck replacement, tapered insulation to fix drainage, tall parapets and complex edge detail, heavy rooftop equipment that needs curbs rebuilt or units temporarily lifted, and Wisconsin commercial energy code R-value upgrades triggered when you tear off to the deck. That last one surprises owners most. Adding a layer of polyiso can also change edge metal heights and door thresholds.

Expected service life, so you can judge how much roof you have left: EPDM 20-30 years, TPO 20-25, modified bitumen 15-25, built-up 20-30, coatings roughly 10-15 years of added service life per cycle. A 1990s roof with no documented maintenance history is near the end regardless of how it looks from the parking lot.

Paying for it. Most owners fund from reserves, phase the roof by section over two or three budget years (very workable on a large low-slope roof), or use third-party financing. Two things worth asking about before you sign anything: your CPA on the federal expensing rules for nonresidential roof replacements that changed in the 2017 tax law, and your utility on Wisconsin's Focus on Energy business incentives, which have covered efficiency improvements including insulation upgrades. Incentive programs usually require pre-approval before work starts, so ask early rather than after the dumpster leaves.

Is a coating a legitimate way to defer replacement?

Yes, when the roof qualifies. A silicone restoration over a sound, dry roof commonly adds about 10-15 years of service life at a fraction of tear-off cost. Good candidate: cores are dry, seams and flashings are intact or repairable, drainage works, membrane is aged but not shrinking.

Note that the warranty term and the service life are two different things. Manufacturers typically write coating warranties at 10, 15 or 20 years depending on applied mil thickness, and the warranty is a repair promise with conditions, not a prediction of how long the coating lasts.

Bad candidate: wet insulation anywhere meaningful, widespread seam failure, uncorrected ponding, or a membrane that has shrunk away from details. Coating that roof buries the water and you pay twice. Any contractor who quotes a coating without cutting cores is guessing with your money.

Warranties: NDL versus material-only, and whether they transfer

A material-only manufacturer warranty covers the cost of the membrane itself, not the labor to find or fix the leak. An NDL (no dollar limit) warranty covers materials and labor to repair covered defects, usually 15-30 years, but it is only available through installers the manufacturer has approved, using an approved assembly, and it typically requires documented maintenance and prompt leak reporting.

Pull your certificate before anyone opens the roof. Repairs by a non-approved contractor can void active coverage, and "I'm under warranty" is not the same as "I'm covered." Ponding, abuse from rooftop trades and lack of maintenance are standard exclusions.

If you may sell or refinance

Ask about transferability now, not at closing. NDL warranties are often transferable but rarely automatic: expect a written notice requirement within a set window after the sale (commonly 30 to 60 days), a transfer fee, and a manufacturer inspection, with any repairs it turns up completed before the transfer is approved. Contractor workmanship warranties vary, so get the term and the transfer language in writing.

A complete roof file (warranty certificate, dated inspection reports, repair invoices, core cut results, photos) does real work in a buyer's or lender's due diligence. Roof age with no records reads as risk, and risk gets priced into the deal.

Who pays in a multi-tenant building

Your lease decides this, not industry custom. For the retail, office and clinic space around Monona, the pattern usually looks like this:

How to document it cleanly: keep repair and replacement invoices separate, ask your contractor for scope language that clearly distinguishes maintenance from capital work, keep every inspection report in the roof file, and give tenants the notice your lease requires. Owners who have that paperwork rarely fight about CAM allocation. Owners who do not, do.

Business interruption: will my tenants have to close?

Almost never for the roof work itself. The work happens above the ceiling, and tenants generally stay open.

What you should nail down before day one:

• Hours. Noise-sensitive tenants (dental, medical, professional office) can usually be handled with early-morning or between-appointment scheduling. After-hours and weekend work is possible and does carry a labor premium. Get it priced, not promised.
• Staging and access. Dumpster, material drop and crane placement that does not block deliveries or customer entrances.
• Fumes. Adhesive and torch-applied work needs intake planning so nothing gets pulled into occupied space.
• Interior access for drain or ceiling work, scheduled in writing with the specific tenant.
• Liability if a leak damages tenant inventory during the project. This belongs in the contract, not a handshake. Ask for a current certificate of general liability insurance sent directly from the agency, ask to be named as additional insured, and confirm in writing what temporary protection goes on the roof each night when the deck is open. Then tell tenants to keep their own contents coverage current.

Duration: a localized repair is usually one day. A 20,000 square foot tear-off commonly runs two to four weeks depending on deck condition, equipment and weather. Wisconsin adds a real constraint, since adhesives and hot-applied systems need dry decks and minimum temperatures. Build float into your plan and expect honest weather calls rather than crews working a wet deck.

Inspection cadence, and why it protects you twice

Twice a year plus after any significant storm. That cadence is what National Roofing Contractors Association guidance and most manufacturers' maintenance requirements both point to: spring, when freeze-thaw damage shows; fall, so drains are clear and open details are sealed before snow buries them; and post-storm, because hail fractures membrane and wind breaks adhesion in ways invisible from the ground.

That schedule also builds your warranty compliance file and your insurance paper trail. We handle the documentation side under commercial roof maintenance, and when something turns up, commercial roof repair is almost always the cheaper road if you get there before the insulation is wet. The full breakdown by membrane type lives on our commercial roofing page.

Insurance reality on commercial storm claims

Commercial claims are a different animal than residential. Before you file, read your declarations page with your agent for four things:

• Percentage wind and hail deductible. Commonly 1%-5% of insured value, which on a commercial building can mean a deductible far larger than the repair.
• Cosmetic damage exclusion. Common on metal and increasingly written into commercial policies. Dents without a breach may not be payable.
• ACV versus RCV on the roof. Roof-age schedules can pay depreciated value on an older roof, leaving you a large gap.
• Renewal exposure. Claims history can affect renewal and pricing. Your agent, not your roofer, is the right person to weigh that.

What we do: inspect, photograph, cut cores where appropriate, document storm-related damage, and meet your adjuster on the roof so hail bruising and wind uplift are not written off as age. What we do not do is adjust or negotiate your claim. In Wisconsin only a licensed public adjuster can do that. If you suspect a storm event, start with our hail and storm damage restoration process.

A dated pre-storm inspection report does not guarantee a paid claim, but it materially strengthens your position when an adjuster is deciding between "storm" and "wear and tear."

How to compare bids apples to apples

Certifications alone will not tell you which bid is better. Put every bidder on the same spec sheet and compare these line by line:

• Membrane type and thickness (60 mil versus 80 mil TPO is not the same roof)
• Insulation type and total R-value, and whether the code-triggered upgrade is included or excluded
• Attachment method and fastening pattern: mechanically fastened, fully adhered or ballasted, and whether perimeter and corner zones are enhanced per the wind design
• Edge metal: tested edge systems (ANSI/SPRI ES-1 is the standard to ask about) versus shop-bent generic trim
• Drainage work: tapered insulation, crickets, new drain bowls and clamping rings, sump work
• Unit price for wet insulation and deck replacement, so a change order does not become a negotiation
• Warranty type, term and who issues it, plus whether it is transferable
• Permit, tenant coordination hours, walkway pads, daily protection and cleanup

Also ask for the manufacturer certification or approved-applicator letter for the exact system being proposed, and ask plainly which single-ply systems each bidder is approved to warranty and which they are not. We will answer that in writing for your building. On the residential side we hold GAF Master Elite certification, which is a residential credential, so do not accept it (from us or anyone) as proof of commercial single-ply approval. Get the commercial letter.

Then verify the basics: Wisconsin contractor credentials, the City of Monona permit pulled by the contractor rather than by you, current liability and workers' compensation certificates sent from the agency, and a written fall-protection plan. Low-slope work is OSHA fall-protection work, and crews near an unprotected roof edge should be tied off or behind warning lines. Ask for references from other property managers and look at real recent projects.

Be skeptical of anyone who shows up after a storm with an out-of-state plate, no cores cut, and a same-day signature push. That is the pattern that leaves owners with a voided warranty and nobody to call in year three.

The honest next step

If you have seen even one sign on the list above, get eyes on the roof before the ground freezes. Not because the building falls apart tomorrow, but because every week water sits is more insulation you will pay to remove later.

The inspection is free, on-site, and there is no pressure at the end. If you have five good years left and just need drains cleared and two pitch pans rebuilt, we will say so in writing. We would rather earn the re-roof when you actually need it.

Buckshot Exteriors has been family-owned and locally operated since 1979, we handle the full exterior stack from roofing to siding and gutters, and we run 24-hour emergency response when a membrane opens up mid-storm. You can read what local property owners say on our customer reviews page.

Call (608) 909-9109 for a free commercial roof inspection. Tell us what you are seeing inside the building and we will find where it is coming from.