If you manage a commercial building in Rockford and you are looking at a roof coating or a recoat, it is worth slowing down. On most commercial roofs, replacement is the better buy. A coating can look cheaper and faster, and it is often pushed for that reason. Most of the time it is the wrong choice, and it will cost more in the long run once the coating fails and the roof still has to come off.
You cannot see wet insulation from the surface. A free inspection and estimate includes FLIR thermal imaging and moisture testing, so we know what is under the membrane before anyone recommends a coating. Martin Exteriors will say so if a coating is one of the rare cases that fits. Most of the time, we will recommend a replacement.
Why Replacement Is Usually the Better Buy
A coating is a liquid layer rolled or sprayed over the roof you already have. The old membrane, the insulation, and the deck stay in place. That only works if those layers are still sound and dry. On many Rockford commercial buildings, they are not.
Replacement gets wet or failed material out and puts a new membrane down over a dry, sound base. You start clean. When we put a new commercial roof on, we can offer a 20 year warranty on the work, once the system and the application are approved. A coating on a tired roof does not give you that same starting point. Our commercial roofing page covers the systems and the warranty in more detail.
How a FLIR Scan and Moisture Testing Decide Coating vs Replacement
You cannot judge a commercial roof by looking at the surface alone. Water can sit in the insulation under the membrane, out of sight, and a coating over that wet area traps the moisture in place. That is why we do not recommend a coating or a replacement until we have checked for hidden water.
We start with FLIR thermal imaging, which is infrared imaging of the roof surface. Our camera is a Teledyne FLIR i64. It shows temperature differences across the roof, and because wet insulation and dry insulation do not cool the same way, those differences tell us where to look closer. The FLIR scan is a map, not the final word.
Next we test those spots with a Tramex Roofing Inspector Kit moisture meter. The meter readings tell us whether the insulation is actually wet, and we can often do that without opening the roof. If we still need to see the layers themselves, we may take a small core sample in one or two places and patch those spots before we leave.
You leave with a written report that includes the FLIR images and the moisture meter results. That report is what decides the call. If the insulation is wet, a coating is the wrong choice, and replacement is the better buy. If anyone pushes a coating without a full moisture survey that includes FLIR thermal imaging and moisture testing, that should be a red flag. They have not checked for wet insulation, and you would not yet know what you are sealing in. For a fuller walkthrough of the tools and the visit, see how a flat roof moisture survey works in Rockford.
Why Coatings Get Pushed, and Why That Costs More in the Long Run
A coating is quicker to sell and quicker to put down than a full replacement. That makes it quick, easy money for a contractor who wants a job this week and does not have to stand behind a new roof for the long run. The pitch is usually the lower bill and less disruption.
Most of the time that pitch is the wrong choice for the building. If the insulation is already wet, if seams are failing, if water keeps ponding, or if the membrane is simply worn out, the coating sits on top of a problem it cannot solve. You pay for the coating now, the leak comes back, and you still pay for a replacement later. The second job is often messier, because the coating and the old membrane both have to come off, and wet insulation still has to be replaced.
We would rather tell you that up front than sell you a coating that will not last.
When Replacement Is the Right Call
Replacement is the usual path when a coating would cover a problem instead of fixing it.
Wet insulation. If the FLIR scan and moisture testing show water under the membrane, a coating would trap it. The wet material has to come out, and a new membrane has to go down over dry insulation.
Ponding water. If water sits in the same low spots after a rain, the issue is slope or drainage, not the color of the surface. A coating will not lift a low area or open a drain. On a replacement we can plan tapered insulation and drain work so water has a path off the roof.
Membrane failure. Open seams across large areas, a membrane that is shrinking and pulling at the edges, widespread cracks, or punctures that keep appearing are signs the sheet itself is at the end of its life. Coating over a failed membrane leaves those failure points under a thin new layer.
Age and recurring leaks. If leaks keep coming back in different spots, or the roof has simply worn out, you are no longer buying time with a coating. You are delaying a job you will have to do anyway, and you may pay for the coating and the replacement.
The Rare Case Where a Coating Can Fit
A coating is uncommon, not the default. It can make sense only when all of this is true: the membrane still has useful life, wear is mostly on the surface, the insulation underneath is dry, the deck is sound, any leak has already been fixed at the source, and water is draining off the roof the way it should.
When a roof truly qualifies, we still offer roof coatings and restoration as part of our commercial roof repair and maintenance work. We will say so plainly if that is what we see. We will not recommend a coating just because it is faster to sell.
How We Help You Decide
The visit is a free inspection and estimate. We walk the seams, flashings, drains, and rooftop units, and we use FLIR thermal imaging and moisture testing to check under the membrane before we recommend a coating or a replacement. You get a plain written answer. If a coating is truly a fit, we will tell you. Most of the time, the honest answer is a replacement. For a walkthrough of the visit itself, see our commercial roof inspection post.
We will not talk you into a new roof you do not need. We also will not sell a coating that would trap a problem in place, or that is being sold because it is the quicker paycheck.
If Replacement Is the Path
The flat and low slope roofs we replace in Rockford are usually TPO, EPDM, PVC, or modified bitumen. Some buildings have metal instead. Most of the commercial roofs we replace get TPO, and its seams are heat welded rather than glued. We also install EPDM and PVC, and we hold Mule-Hide Warranty Eligible Contractor status for those systems. For how a new TPO or flat roof goes on, see TPO and flat roof installation in Rockford. To compare membranes, see TPO vs EPDM for a Rockford flat roof.
The number that counts is the one we put in writing after we see your roof. We do not quote a commercial coating or replacement price over the phone, because the moisture under the membrane changes the scope.
Why Rockford Businesses Call Martin Exteriors
Martin Exteriors Roofing & Siding is family owned and has been working on commercial roofs in Rockford and the Stateline since 2006. We are a GAF Master Elite contractor (fewer than 2% of contractors qualify) and a Mule-Hide Warranty Eligible Contractor. We’re open 24 hours. Call (815) 209-9054 if a leak is running into the building. We can stop the water first, then inspect the roof and give you a written plan.
Commercial Roof Coating vs Replacement FAQs
Is a coating ever the right choice on a commercial roof?
Rarely. A coating can fit only when the membrane still has life in it, the insulation is dry, the deck is sound, and water is draining the way it should. That is uncommon. Most of the time, replacement is the better buy. A free inspection and estimate is how we tell you which one your roof is.
Is a commercial roof coating cheaper than a replacement?
A coating usually costs less up front, which is why it gets pushed. Most of the time it is the wrong choice, and it costs more in the long run because you pay for the coating now and a replacement later. The number that counts is the one we put in writing after we see your roof.
Why do contractors push roof coatings?
A coating is quicker to sell and quicker to install than a replacement, so it can be quick, easy money for the seller. That does not make it the right job for your building. We would rather recommend a replacement when that is what the roof needs.
Can you coat a roof that is already leaking?
Usually no, and not as the first step. The leak source has to be found and fixed, and the insulation underneath has to be dry. Coating over an active leak or wet insulation seals moisture in. If the leaks are in several places or the membrane is worn out, replacement is the better call.
Can you tell if a commercial roof has wet insulation just by looking at it?
You often cannot tell from the surface or from one interior stain. We use FLIR thermal imaging and moisture testing, then put the FLIR images and meter readings in your written report. That is how we decide whether a rare coating case exists, or whether replacement is the better buy. See our flat roof moisture survey for how that visit works.
Do you use FLIR or moisture testing before recommending a coating or replacement?
Yes. We use a Teledyne FLIR i64 for thermal imaging and a Tramex moisture meter to look for wet insulation under the membrane, and we may take a core sample if we still need to confirm what is underneath. A coating over wet insulation traps the moisture, so we run these tests first. Most of the time the results point to replacement.
Is it a red flag if someone recommends a coating without a moisture survey?
Yes. A full moisture survey uses FLIR thermal imaging and moisture testing to find wet insulation under the membrane. Anyone who recommends a coating without that survey has not checked for hidden water, and a coating over wet insulation traps it. We run these tests before we recommend a coating or a replacement.
Does a roof coating fix ponding water?
No. Ponding means water is sitting because of slope or drainage. A coating does not change the shape of the roof or open a drain. Those issues get planned into a replacement, or into a repair if the rest of the roof is still sound.
What kind of warranty comes with a replacement?
We can offer a 20 year warranty on commercial roofs we replace, once the system and the application are approved. A coating on a tired roof does not start you in the same place, which is one more reason replacement is usually the better buy.
Do you offer roof coatings, or only replacements?
Both, but a coating is the exception, not the rule. When a roof truly qualifies, we offer coatings and restoration through our commercial roof repair and maintenance work. Most of the time we take the failed roof off and install a new TPO, EPDM, PVC, modified bitumen, or metal system. See our commercial roofing page for the full picture.
Can you come out if the roof is leaking today?
Yes. We’re open 24 hours. Call (815) 209-9054. We can stop the water first, then inspect the roof and give you a written plan.
Do you offer financing?
Yes, with payments as low as $149/month for qualified buyers.
Get Your Free Inspection and Estimate
Call (815) 209-9054. We’re open 24 hours, or you can request your free inspection and estimate online.
