Soprema Roofing and Waterproofing in Rockford, IL
Soprema SBS modified bitumen and liquid flashing in Rockford, IL: torch-free options, cold-applied systems and details for old downtown brick roofs.
Soprema Roofing and Waterproofing
Soprema Roofing and Waterproofing
Rockford, IL
Ice builds behind a parapet long before anyone sees it from the street. On an old downtown brick building in Rockford, IL, meltwater runs to the low edge of the roof, refreezes behind the coping and lifts the flashing a little more with each cycle until a ceiling stain shows up in the unit below. Soprema makes the kind of products that suit roofs with that sort of detail. The company is based in France, and its Sopralene SBS modified bitumen sheets come in torch-applied, self-adhered and cold-applied forms, backed by Colphene adhesives, Alsan RS liquid flashing resin and polyiso boards. For a building with parapets, penetrations and tight corners, those options give a contractor more ways to make a watertight detail without an open flame.
Before you sign, ask the bidder to show you the detail drawing for your worst corner. The answer is the roof.
Read the parapet and the flashing on a downtown brick building
Downtown Rockford carries a wide mix: the Ziock tower on South Main, a 19-story hotel with a rooftop bar and pool, the Faust Hotel from 1929, the Coronado Theatre from 1927, and the brick freight station on Church Street that the city wants to turn into apartments and storefronts before Metra service returns. Each of those buildings carries its own roof, and any older downtown building tends to meet winter at the same weak points. Parapet walls hold moisture, copings loosen, and base flashings tear when the wall moves against the roof. With about 134 freezing days a year, the water that gets behind a loose termination in November is freezing and thawing against it by January. Layered SBS sheets handle that movement because the asphalt stays elastic at low temperatures.
Walk the perimeter on the first mild day after a hard freeze, and look for cracks along the flashing and gaps at the coping joints.
Choose torch, self-adhered or cold-applied with the neighbors in mind
The same modified bitumen sheet can be applied three ways, and each fits a different building. Torch-applied installs bond fast and form strong laps, but an open flame on an older building with wood blocking or rooftop gas lines calls for fire watch and careful planning. Self-adhered sheets have a sticky underside and go down with no flame at all, so they suit occupied buildings, hotels and historic structures where fire is the main worry. Cold-applied systems use adhesive, such as Colphene, and produce little smoke, though they need the right surface temperature to cure. Match the method to the roof, the occupants and the season. A modified bitumen job over a hotel where guests are sleeping starts with that question.
If a bidder reaches for a torch without discussing the building, ask why.
Use liquid flashing where sheets cannot fold
Some details are simply hard to flash with a sheet: a cluster of pipes, a cluttered equipment curb, an odd wall penetration, a drain with several conduits. Alsan RS is a liquid-applied resin that cures into a continuous, reinforced layer that bonds to the roof and the penetration, so there are no folds or laps to open under freeze-thaw. It is a repair and detailing tool that earns its cost where sheet flashings keep failing. Where a parapet cap or a stubborn corner keeps failing, it can sometimes seal the detail without a rebuild. Ask a bidder where liquid flashing would help on your roof, and what substrate preparation it needs. The same attention to detail belongs on skylight and penetration flashing and on the edge metal and coping that close the perimeter.
- Which details on this roof will be liquid-applied, and which will be sheet?
- What primer and substrate prep are required?
- How is the cured resin inspected?
Spend on the details before you spend on the field
On a downtown roof, the field is rarely the problem. Walls, drains, curbs and edges carry most of the risk, and a bid that puts all its money into the main membrane and none into the details will fail where the roof is busiest. Ask the bidder to price the details separately: base flashings, counterflashings, coping, drains and penetrations. That makes it easy to see where a proposal is thin and where it is padded. It also lets you phase the work, repairing the worst details now and replacing the field later if the insulation tests dry. If you are weighing modified bitumen against a similar assembly from GAF or Johns Manville, give every bidder the same drawings and the same questions, and compare the answers.
Cheap details cost the most to fix twice. Pay for them once.
Wait for the surface temperature the adhesive needs
Self-adhered and cold-applied products want a clean, dry surface and temperatures that let the adhesive bond, which rules out most of Rockford's winter. Plan the work for late spring through early fall, and use a dry-in for any leak that cannot wait. A downtown building with tenants, hotel guests or event crowds needs a sequence that keeps entrances clear, protects air intakes and limits noise at the wrong hours. A roof over a space that is occupied all day calls for occupied building reroofing, with phasing, protection and clear communication with tenants. Owners near downtown Rockford should also check rooftop access, crane permits and street closures before the crew arrives.
Deliveries matter too. The multiyear rebuild of I-39 that IDOT started in March 2026, running from U.S. 20 up to Mulford Road, puts work zones in the way of the trucks that bring rolls, adhesive and pallets of board into town. Build a day or two of slack into the schedule, order material before the work window opens and store it dry on site. Rolls of modified bitumen should sit on end, out of the sun, and adhesives should stay warm enough to pour. A crew waiting on a late truck is a crew with a half-open roof, and that is the exact situation to avoid.
When reviewing any proposed assembly, check that the manufacturer documentation matches the exact membrane, insulation, cover board and attachment method in the contractor's submittal. An approved component list is more useful than a broad product label. Keep delivery tickets and lot information with the closeout package, and photograph concealed layers before the next sheet covers them. Those records make a future repair easier to specify, especially where older roofs in Downtown Rockford meet newer additions with different substrates.
Questions Owners Ask
Can modified bitumen go on without a torch?
Yes. Self-adhered and cold-applied versions exist for roofs where an open flame is a concern. Each needs a clean, dry surface and weather that lets the adhesive set.
What is liquid flashing good for?
Odd shapes. Penetration clusters, irregular curbs and tight corners are easier to seal with a resin that flows and cures than with folded sheet. It still needs primer and a sound surface underneath.
Is SBS better for cold climates than other asphalt sheets?
SBS stays flexible when temperatures fall, which suits Rockford's freezing days. APP is stiffer and handles heat well. The roof's exposure and the method of application guide the pick.
How do I protect a historic building during reroofing?
Avoid open flame, protect masonry and old windows, and document existing conditions with photographs. Ask what the crew does at parapets and cornices, since those are the delicate parts.
Will a new roof fix a leak at the parapet?
Only if the parapet is addressed too. Cracked masonry and loose coping let water behind the new flashing. Rebuild or seal the wall details alongside the field.
