PVC Roofing in Rockford, IL
PVC roofing in Rockford, IL for kitchens, plants and hangars: where grease and chemical resistance pay off, how PVC ages in the cold, and what it costs you.
PVC Roofing
PVC Roofing
Rockford, IL
Grease from a kitchen exhaust fan bakes onto a flat roof all summer, and then a winter in Rockford, IL pulls on that same surface for about 134 freezing days. Some membranes soften under that fat and crack where the cold catches them. PVC was made for exactly this kind of roof: the sheet resists animal and vegetable fats, oils and many airborne chemicals, and its seams are welded with hot air into a single piece of plastic. That is also why PVC costs more than most single-ply sheets, and why an owner should not buy it for a plain storage building with nothing on the roof but a vent or two. Pay for PVC where the roof is under chemical attack, and save the money where it is not.
If the roof you own has a restaurant, a lab, a paint line or an engine shop underneath it, get a PVC price. If it does not, compare it with TPO before you decide.
Match the membrane to what lands on it
Rockford buildings put odd things on their roofs. Painting and machining are the kind of work that can send vapors and oily mist out of rooftop fans, and in the Loves Park manufacturing area, process exhaust can carry oils toward nearby roof details. A 200,000 square foot aircraft maintenance facility like the AAR building at Chicago Rockford International Airport is the kind of operation where solvents and fumes can end up in the exhaust. A hospital kitchen or a restaurant puts grease on a roof every week. On a membrane that is not built for it, those contaminants leach plasticizer, stiffen the sheet and shorten its life, and the first sign is a crack at a seam or a flashing during a January cold snap. PVC shrugs off most of that exposure, which is the reason it is specified near exhaust.
Walk to the exhaust fans on your roof and look at the membrane around them. If it is slick, stained or soft, tell us before you pick a system.
A maintenance building on the airport side also has to be roofed around airside access and the shop's own schedule.
Learn how PVC ages before you pay the premium
Nobody should sell PVC as maintenance-free. The sheet gets its flexibility from plasticizers, and over many years some of that plasticizer migrates out, which stiffens the membrane, especially on a north-facing slope that never warms up. In a climate with 12 or so days a year below zero, a stiff old sheet is a sheet that cracks at a cold-weather impact, such as a roof drain cover dropped in January. Better formulations hold their plasticizer longer, and reinforced sheets with heavier top plies cost more but resist this. Manufacturers such as Sika Sarnafil and Duro-Last sell PVC systems with different thicknesses, reinforcement and warranty terms, so compare those details instead of the color.
Ask what thickness is in your bid and ask what the sheet is reinforced with. A thin sheet at a PVC price is not a deal.
Decide whether the premium is your money well spent
PVC usually runs above TPO on the same roof, and the gap is the number to understand before you sign. On a roof with grease or chemical exposure, that gap is cheap insurance against replacing a failed membrane early. On a roof with no exhaust at all, you may be paying for protection from something that never touches the sheet. A fair price also covers the details: prefabricated corners and pipe boots, welded flashings, a cover board where the deck is old, and a written test of every seam. Ask for a PVC bid and a TPO bid on the same scope and look at what the difference actually buys.
- Which rooftop units discharge grease, oil or fumes, and where?
- Is the premium for thickness, for chemical resistance, or for the brand?
- What does the warranty say about exhaust and chemical exposure?
Restaurant owners and hospital facility managers should ask the last question twice, because exhaust exclusions are easy to miss. On a restaurant roof, that question comes first.
Keep PVC away from asphalt, foam and coal tar
PVC does not get along with a number of common roof materials. Direct contact with old asphalt, coal tar pitch and some polystyrene insulations can attack the sheet and shorten its life, so a recover over an old built-up roof or a modified bitumen roof needs a separation layer or a new cover board between the old and new. This is the kind of detail that gets skipped on a low bid. A related risk shows up in repairs: patching a PVC roof with the wrong sealant can pit the membrane and spread the damage. Compare that with a close cousin, KEE roofing, which is PVC with a ketone additive that resists plasticizer loss even better, and ask your contractor why they chose one over the other.
A contractor who cannot name the separation layer on your roof has not looked at it closely enough.
Install with the exhaust fans and the weather in mind
Cold stiffens PVC more than it does TPO, and a stiff sheet is harder to form around corners and curbs, so the best Rockford installs are late spring through early fall. Keep rooftop kitchen and process exhausts running safely during the work, which usually means planning hoods and fans in phases with the facility manager. Fire is the other exposure owners ask about. The Chemtool plant explosion and fire in Rockton on June 14, 2021 forced a one-mile evacuation, and heat and residue on a PVC sheet are the damage that fire damage roof repair has to sort out. For any roof with a hospital or a high-value plant below it, such as the Loves Park manufacturers, plan the work so nothing is open overnight.
Call before the first hard freeze if you want the work done this year. After that, a dry-in and a spring install is the better path.
On an exposed roof, heat-welded PVC seams should be checked after cooling, with test welds used to confirm the machine setting before production work continues. Pay close attention to corners, curb wraps and terminations, where a sound field seam can still meet a weak detail. Rockford buildings range from industrial roofs in Loves Park to aircraft-maintenance space at the North Main freight area; the membrane choice should reflect actual chemical exposure and service traffic at the specific building rather than a general category.
Questions Owners Ask
Will kitchen grease ruin a PVC roof?
Not nearly as fast as it ruins some other membranes. PVC resists fats and oils, but grease still builds up, so exhaust fans need grease containment and the roof needs cleaning.
Is PVC worth more than TPO?
Only where chemicals, grease or fumes reach the roof. On a clean warehouse roof, TPO is often the fairer price. Get both bids on one scope and compare line by line.
Does PVC crack in a Rockford winter?
A healthy PVC sheet flexes through freezing weather, and welded seams hold well. An old, plasticizer-depleted sheet can crack at an impact, so look at the age and condition of what you have.
Can PVC be installed over my old roof?
Over some, yes. Asphalt-based roofs need a separation layer, and wet insulation has to come out first. A moisture scan tells us which case you have.
How do I find out who is liable for chemical damage?
Read the warranty exclusions before an exhaust problem appears. Many exclude chemical exposure unless the system was selected for it, and that choice needs to be on paper.
