Sika Sarnafil PVC Roofing in Rockford, IL
Sika Sarnafil PVC roofing in Rockford, IL: welded thermoplastic sheets for hospitals, kitchens and wet roofs, and what to ask before you buy the premium.
Sika Sarnafil PVC Roofing
Sika Sarnafil PVC Roofing
Rockford, IL
A hard refreeze after a thaw turns every puddle on a flat roof into a sheet of ice, and in Rockford, IL that cycle repeats on dozens of nights each winter. The membrane under that ice has to stay watertight while it is wet, cold and sometimes covered in salt, grease or exhaust residue. That is the job Sika Sarnafil designed its reinforced PVC sheets for. Sarnafil comes from the roofing arm of Sika, a Swiss company, and it is among the best known names in thermoplastic membranes, with felt-backed versions for adhered installs and welded seams that fuse into one piece. It costs more than some alternatives, and an owner has every right to ask whether the premium fits the building. Sometimes it does. Sometimes a cheaper sheet does the job just as well.
Be frank with the bidder about what lands on your roof. Grease, chemicals, foot traffic and standing water decide whether PVC earns its price.
Know what makes a PVC sheet different from the rest
PVC is a thermoplastic with a polyester or glass-fiber reinforcing layer, and its seams are welded with hot air so the joint becomes part of the sheet itself. That is why it resists many oils, fats and chemicals that attack other membranes, and why it is common over restaurants, labs, food processors and rooftops with heavy exhaust. A properly welded PVC seam does not rely on adhesive to hold water out, which suits a freeze-thaw climate. The tradeoffs are cost and some stiffness in a deep freeze, so installers have to be careful about handling and welding when it is very cold. Sarnafil is also sold in a felt-backed form that is adhered rather than screwed down, which is useful where fasteners should not go through a deck. Every seam on a PVC roof we weld gets probed before it is covered.
A PVC bid should name the reinforcement, the thickness and the attachment. If it does not, ask.
Follow the water across a hospital campus roof
Water is the story on a campus like Mercyhealth's Javon Bea Hospital-Riverside, a $505 million building opened in 2019 and described as the largest construction project in Rockford history. A June 2018 flood caused $30 million in damage at the system's Rockton Avenue cancer facility, and Mercyhealth opened a 19,000 square foot Cancer Institute at Javon Bea Hospital-Riverside in May 2025, a move off Rockton Avenue that followed that flood. Then a 200-year flooding event in July 2024 overwhelmed Rockford's stormwater systems. A roof over a clinical space has to handle that kind of rain, and a backed-up drain does not wait for a convenient week to fail. PVC tolerates a few hours of standing water better than most sheets, but no manufacturer wants a roof that ponds for days, so drains, sumps and tapered insulation matter just as much here.
Winter adds a quieter version of the same problem. Meltwater that cannot reach a frozen drain spreads across the roof, refreezes overnight and leaves ice rings around sumps, and about 134 freezing days a year gives that process plenty of chances. Ice sitting against a flashing edge lifts it a little more with every cycle. A welded sheet shrugs off the water, but the terminations at walls and drains are where the work either holds or fails, so they deserve the closest look.
Walk a campus roof after a heavy rain and note which areas hold water. That list is your first repair plan. A drain and scupper review belongs near the top of it.
Keep the sheet away from what attacks it
PVC has its own enemies. Direct contact with asphalt, coal tar and some foam products can pull plasticizer out of the sheet, so a recover over an old built-up roof needs a separator layer or a cover board. Rooftop traffic wears any sheet, and walkway pads matter on roofs that technicians cross to reach equipment. On a hospital or a medical campus, the roofing plan should also say how fresh air intakes are protected, how the work is phased around operating areas and how noise and vibration are kept away from sensitive rooms. These are questions about the building, not the brand. Those questions come up on every hospital roofing job and across any healthcare system portfolio.
- What separates the PVC from old asphalt or foam below it?
- Where are walkway pads installed, and who maintains them?
- How are the air intakes shielded during the work?
Pay the premium only where the building earns it
Sarnafil PVC usually costs more than TPO or EPDM, and that is reasonable on the right roof. A restaurant with a grease-laden exhaust, a medical building with chemicals or a roof that sees heavy foot traffic can justify it. A plain, dry warehouse roof usually cannot, and a bidder who recommends PVC for everything is selling a product, not a solution. Ask for the price of PVC next to the price of a TPO or EPDM option, and look at what each one adds beyond the membrane. If you are shopping across brands, Versico also sells PVC, and a fair comparison puts both bids on the same insulation, the same flashing details and the same drains. Compare the warranty forms too, because the exclusions say as much as the price.
If the premium cannot be explained in plain words, you are probably paying for the label.
Plan the welding for dry mornings and mild weeks
PVC welds best on a dry sheet in moderate temperatures, so Rockford's good windows run from late spring through early fall. Cold mornings stiffen the sheet and slow the work, and damp surfaces spoil a weld. Hospitals and clinics rarely close, so the work gets phased in sections, with each area dried in before the crew leaves and each seam probed before it is covered. For a campus along the Rockton Avenue corridor, schedule the loudest work around procedures and visiting hours. If a thaw has already opened a leak, get a temporary dry-in first. Do not install a permanent PVC sheet in a rush when the forecast is uncertain. When oils and abuse are the main concern, KEE roofing is the other sheet worth pricing. A second PVC option such as Carlisle SynTec should be compared by its approved details and product data.
For a membrane project, confirm that the crew's hot-air welder settings and test-weld routine are part of the quality plan. Probe field seams after they cool, and keep test coupons when the specification calls for them. A job near Rockton Avenue may need quiet phasing around healthcare operations, while a roof in Belvidere may prioritize uninterrupted plant access; neither use changes the need to document the assembly and its edge details. Owner representatives should receive the inspection record before temporary protection comes down.
Questions Owners Ask
Does PVC cost more than TPO in Rockford?
Usually it does. The extra cost buys chemical resistance and a tough welded seam, which pays back over kitchens and labs. Over a dry warehouse it often does not.
Will a PVC roof handle our winters?
It will, with careful handling. The sheet stiffens in deep cold, so installation is best in milder weeks. Once in place, welded seams and a clean drainage plan carry it through freeze-thaw cycles.
Can PVC go over an old asphalt roof?
Only with protection. Asphalt can attack PVC, so a separator or cover board goes in between. A moisture scan of the old roof comes first.
What if the roof ponds after rain?
Fix the drainage. Some manufacturer warranties exclude ponding beyond a short window, and standing water speeds dirt build-up on any membrane. Tapered insulation or new drains usually solve it.
How do I check the welds when the crew finishes?
Ask for probe testing along every seam, photographs of each detail and a signed walkthrough. A weak weld is far cheaper to fix on the day it is made.
