Sika Sarnafil Roofing in Davenport, IA
Sika Sarnafil welded PVC roofing for Davenport, IA historic blocks, theaters, restaurants and riverfront buildings: flashings, install and repair.
The house manager at a downtown theater finds a drip in the lobby two hours before curtain. Facilities pulls the roof drawing from the shelf. The membrane is listed as Sarnafil.
That is a good sign and a short list of questions. Sika Sarnafil makes welded PVC roofing, the flashings that go with it and the insulation underneath. Its sheet has a long record on low-slope roofs. Whether the roof in front of you in Davenport, IA is one of them, and whether it needs a patch or a bigger answer, is what a walkthrough sorts out. We install Sika Sarnafil systems and repair the ones already up.
Welded PVC, Reinforced Two Ways
A Sarnafil membrane is PVC with a reinforcing layer inside. Some versions use glass fiber, others use polyester, and felt-backed versions go onto insulation with adhesive instead of fasteners. The seams are hot-air welded, so two sheets become one continuous membrane. A proper weld is stronger than the sheet around it, and we test seams by hand with a probe as we go.
Compared with TPO, PVC resists fats, oils and many chemicals better, which is why it shows up over restaurants, labs and kitchens. Where the exposure is harsher still, owners sometimes step up to a KEE membrane. Holcim Elevate sells a PVC of its own, and the two systems are worth a side-by-side bid. A fully adhered PVC sheet over insulation also gives a smooth surface that suits roofs with a lot of small penetrations.
Flashings That Match the Sheet
Most leaks start at a detail, not in the field. Sarnafil addresses that with prefabricated corners and pipe boots, and with coated metal sheet that PVC can be welded to. Called Sarnaclad, that coated metal turns edge flashings and curb flashings into a welded extension of the membrane, with no sealant joint to fail when the temperature swings.
On a roof with a dozen rooftop units, that matters. Each curb gets a boot, a corner or a wrap that is welded instead of caulked. The crew carries a small kit of formed pieces on the roof, so a surprise at a drain does not stall the day. Where the parapet is brick or stone, we pair the sheet with new coping and edge metal so water leaves the wall as well as the roof.
Brick, Timber and the Village of East Davenport
The Village of East Davenport is a 72-acre National Register historic district along the river, where most of the buildings were put up between 1848 and 1910. Specialty shops, restaurants and theaters now occupy them. A fire in 1901 destroyed twenty acres and caused $1.25 million in losses, and the older masonry and wood-frame roofs here deserve a careful inspection.
That history is a good reason to leave the torch off the roof. Hot-air welding uses no open flame, which is a real advantage in a district with that record and with wood-frame roofs among the older ones. Before work we look at the roof framing from below, check for old leaks that have soaked into rafters, and dry the building in before a sheet goes on. A village roof over a restaurant also needs a grease plan at the exhaust.
Theater Nights and Downtown Parapets
A 100,000-square-foot event complex in downtown Davenport includes both the RiverCenter and Adler Theatre. Union Station dates to 1924, and two of the district's hotels date to 1907 and 1914, the Davenport and the Blackhawk. Downtown Davenport roofs are largely low-slope on historic masonry, so the parapets and the old drains are where a survey starts.
On a PVC roof, a test weld should settle the machine settings before a long seam begins. We tune heat and travel speed on a membrane offcut, then peel the sample to check the fusion. At parapets and penetrations, the field sheet must tie cleanly into each flashing detail. Matinee and load-in times also belong on the work order, so crews can stage material without crossing the lobby flow.
River Air, Ponding and the Flood Question
Modern Woodmen Park on South Gaines Street opened in 1931, seats 4,024 and was ringed by a nine-foot earthen berm in a 2004 renovation. The 2019 flood barrier failure that put downtown under water happened on River Drive at Pershing Avenue. A membrane cannot stop a river. What a roof can do is stay dry above it, so equipment, stock and records moved to upper floors are not rained on as well.
Moist air off the Mississippi also feeds condensation under cold decks. We check for ponding at drains and scuppers, look at the insulation under any standing water and recommend tapered boards at the low points. The River Drive Waterfront has the same damp air, and so does the Bettendorf riverfront where the Isle of Capri hotel and casino stand, so the same discipline applies at both.
Reading an Older Sarnafil Roof
An older sheet will tell you what it needs. A stiff, chalky surface means plasticizer is leaving. Seams that peel under a screwdriver tip are failing. Dirt that does not wash away points to a surface problem rather than a leak. We walk the roof with a probe, take a test weld on a spare piece and decide how far the sheet will accept a repair.
Often a repair is the sensible call, and we make it with matching material. When the sheet has aged past repair, a recover with new insulation and a fresh membrane may fit if cores show the old boards dry. Another prefabricated option, Duro-Last, arrives as measured panels and is worth pricing against a rolled sheet.
Send the Drawing or Book a Walkthrough
Send the roof drawing, the work order or a picture of the label. We will go up with the house manager or the property lead and tell you whether to patch, wait or plan the bigger job. For a storm opening or recurring leak, include the work order and photos so we can assess the roof and access plan.
Questions About Sika Sarnafil Roofing
A Sarnafil roof over our kitchen is five years old and the seams look gray at the exhaust. Is that a problem?
Gray film at an exhaust is usually grease and dust, not damage. Clean a small spot with a cleaner the maker accepts, rinse, and see whether the surface firms up. If the sheet stays tacky or soft, the oil has worked into it and that section should be cut out. Either way, put a grease catch under the fan so the film stops accumulating.
We own an old brick building in the Village. Can a PVC roof go on without open flame?
It can. Hot-air welding needs no torch or kettle, and that is why we propose it for wood-frame roofs and tight historic blocks. Before we start, we inspect the framing and deck from underneath, because the old fire history in the district and years of slow leaks can leave soft wood. Wet or rotten sections get repaired before the new sheet goes down.
What does a theater do on show nights when the roof leaks?
Stop the water, then schedule the permanent work. We can place a temporary patch or tarp in a few hours, leaving the performance undisturbed. After the weekend, we trace the actual path, repair it and give the house manager a written account of what we found, so the next drip gets matched to the same drawing.
Do we need to change the insulation when we replace an older Sarnafil sheet?
Only if it is wet or the code calls for it. Davenport's adopted 2021 codes, amended locally, mean a full replacement often brings insulation up to the present requirement. We test the old boards first. If they are dry and compliant, they can stay and save the budget for the membrane.
How do I find out what leaks are coming from a parapet and not the membrane?
Start with a hose test at the wall, working upward from the bottom of the flashing in sections. We soak masonry joints, copings and the through-wall flashing one at a time, with someone inside watching the ceiling. That narrows the source quickly and keeps you from replacing a sound roof when the brick joints are the real problem.
Talk to a Davenport Commercial Roofer
Send the work order, the building address or a few photos of what you are seeing. We will set a walkthrough, go up with whoever has the hatch key, and tell you plainly what the roof needs.