Commercial Roof Warning Signs McFarland Owners Shouldn’t Ignore

Why a commercial roof hides problems longer than your house does

A pitched shingle roof sheds water fast and shows damage where you can see it. A flat or low-slope commercial roof does the opposite: water sits, drains slowly by design, and any failure in the membrane or a seam has no backup system behind it. One open seam near a rooftop unit or a parapet wall can leak for a long time before anyone inside notices a stain.

The honest math on why this matters: a localized seam or flashing repair in this market commonly runs $600-$3,500. A full tear-off to deck with new insulation on a mid-size commercial building commonly runs $9-$16 per square foot, so a 15,000 square foot roof lands somewhere around $135,000-$240,000. The variable that moves you from the first number to the second is almost always how long water sat in the insulation before anyone caught it.

Warning signs you can catch from inside the building

You don't need to get on the roof to catch most of this. A slow walk through the building with your head up covers a lot of ground.

• Ceiling staining or bubbling paint, especially near columns, HVAC units, or where a roof step changes height. Water on a flat roof rarely drips straight down; it runs along the metal deck and shows up feet away from where it actually got in.
• A musty smell with no visible stain. Wet roof insulation doesn't dry under a membrane, so it sits and grows mold quietly. If a back room or storage area smells different than it did a season ago, look up before you blame the HVAC.
• Rust streaks on ceiling grid, fasteners, or exposed steel. Rust means repeat moisture, not a one-time event.
• Higher heating and cooling bills with no obvious cause. Saturated insulation loses most of its R-value, and a slowly failing roof can show up on the utility bill before it shows up on the ceiling.

What to look for on the roof itself

Ponding water still standing 48 hours after rain. Low-slope roofs are designed to drain slowly, not instantly, but water sitting two full days after a storm points to a clogged drain, a compressed low spot in the insulation, or deck deflection. Standing water accelerates membrane aging and, in a Dane County freeze-thaw winter, works hard on any seam nearby.

Membrane blistering, cracking, or open seams. TPO shows seam separation and stress cracks at penetrations. EPDM shrinks and pulls at corners and lifts at seams. Modified bitumen shows surface alligatoring and granule loss on the cap sheet. Any of these means moisture is finding its way past the top layer.

Rusted or loose flashing at parapets, HVAC curbs, and roof edges. This is where the large majority of commercial roof leaks actually start. McFarland's light-industrial buildings along Siggelkow Road and the Broadway corridor tend to carry a lot of rooftop mechanical equipment, and every curb, vent, and conduit penetration is a place the membrane has to be sealed correctly around. Check for pulled sealant, dried and cracked pitch pans, and metal that has worked loose from wind and thermal cycling.

Clogged drains and scuppers. Cottonwood and maple debris in late spring, leaves in October and November, are the two windows that matter most for keeping drains clear. One blocked drain can pond an entire roof section.

When it's a structural problem, not a roofing problem

Stop and call a licensed structural engineer, not a roofer, if you see:

• Visible sag or deflection in the deck or ceiling
• Spongy or bouncing decking across a wide area, not just a small soft spot
• Ponding showing up somewhere water never used to stand
• New cracks in parapet masonry or a column that looks off

A roofing contractor can tell you the membrane has failed. Only a structural engineer can tell you whether the framing underneath is still safe to load.

What a repair actually costs, and what drives the number

Ranges below reflect current market pricing for this area and move with material costs. They are not quotes.

What actually drives the number up: wet insulation found at tear-off, tapered insulation added to correct drainage, tall parapets and complex edge detail, and Wisconsin commercial energy code insulation upgrades triggered whenever a roof gets torn off to the deck. That last one catches owners off guard most often.

Coating vs replacement: is it a legitimate way to buy time?

Yes, when the roof actually qualifies. A silicone restoration coating over a sound, dry roof can add a decade or more of service life at a fraction of the cost of a tear-off. A good candidate has dry core samples, intact or repairable seams and flashing, and working drainage. A bad candidate has wet insulation anywhere meaningful, widespread seam failure, or membrane that has already shrunk away from the details around it. Coating over a wet roof just seals the water in and delays the same expense at a higher price later. Any contractor proposing a coating without cutting a test core first is guessing with your budget.

Warranty types, and why it matters which one you have

A material-only warranty covers the membrane itself, not the labor to find and fix a leak. An NDL (no dollar limit) warranty covers materials and labor together, usually for 15-30 years, but it's only available through an installer the manufacturer has approved, using their specified assembly, and it typically requires documented maintenance and prompt leak reporting to stay valid.

Pull your certificate before anyone opens the roof. Work done by a non-approved contractor can void active coverage even if the roof itself is fine.

Not sure whether what you're seeing is cosmetic wear or something that needs attention now? A free on-site inspection costs you nothing. We'll walk the roof, cut a core sample if needed, and tell you straight what you have. Call (608) 909-9109.

Who pays: landlord, tenant, or both

If your McFarland property is leased space, the answer lives in the lease, not in general custom.

Keeping repair and replacement invoices separate, and documenting every inspection, makes that conversation far easier when it comes up.

Winter reality on a flat roof

Snow drifting behind parapets and rooftop units is the real risk, not average snowfall. Wind piles snow unevenly, and a roof can be carrying its rated load fine in the open field while a drift behind a parapet is several times deeper. Iced-over drains during a thaw turn snow load into standing water with nowhere to go, which is exactly why clearing drains before the first hard freeze matters more than most owners realize.

Snow removal isn't a routine task, but it becomes necessary when drifts are deep, drains are iced with warmer weather or rain coming, or you already have signs of a leak.

Inspection cadence that actually protects you

Twice a year, plus after any significant storm. That's the cadence pointed to by National Roofing Contractors Association guidance and by most manufacturer maintenance requirements: a spring check after freeze-thaw season, a fall check to clear drains before winter, and a post-storm check because hail and wind damage isn't always visible from the ground.

That inspection history also builds your warranty compliance record and your insurance documentation, which matters if you ever need to file a storm claim. We handle that side of it under commercial roof maintenance, and when something does turn up, commercial roof repair almost always costs less than waiting until the insulation is soaked. The full breakdown of membrane systems and what each one costs lives on our commercial roofing page.

Get eyes on it before the ground freezes

If you've noticed even one sign on this list, it's worth a look now rather than after the first hard winter storm. We'll inspect the roof, check drainage and flashing details, and tell you honestly whether you're looking at a simple repair or something bigger. If your roof has good years left, we'll say so in writing.

Buckshot Exteriors is family-owned and has served McFarland and the surrounding area since 1979. The inspection is free, on-site, and comes with no pressure either way.

Call (608) 909-9109 for a free commercial roof inspection.