Roofing Contractor in Oshkosh, WI Built for Lake Winds and Wisconsin Winters

An ice dam is a ridge of ice that forms at a cold eave when attic heat melts the snow higher up the roof. The meltwater runs down, refreezes at the overhang and pools behind the ice. From there it backs up under shingles and into the soffits, walls and ceilings below.

Oshkosh gets long stretches below freezing with 40–45 inches of snow on top. Many local homes were never insulated or ventilated for that, including balloon-framed Victorians, 1.5-story Cape Cods with knee-wall attics and bungalows with finished upper floors. Warm air escapes into the roof deck, the snow melts from below and the eaves stay cold. The damage often stays hidden until late February or March, when ceiling stains show up and soffit and fascia boards have already started to rot.

• Thick ice ridges or large icicles along gutters and eaves
• Brown water stains on ceilings near exterior walls
• Peeling paint or bubbling drywall under the roofline
• Damp or moldy attic insulation near the eaves
• Soft, discolored soffit or fascia boards
• Water dripping inside window frames during a thaw

We see the worst ice damming on Cape Cods and 1.5-story homes on the south and west sides, on bungalows in the Stevens Park and South Park areas, and on older homes along the Algoma Boulevard corridor where attic insulation is thin or missing.

Our fix: We safely remove ice with low-pressure steam, repair the leak and any damaged decking, then add ice and water shield, better ventilation and heat cable where it makes sense.

High winds can break the adhesive seal under shingle tabs, fold them back and crease them, or tear them off completely. Once the seal fails, the next storm lifts those tabs even more easily. That exposes nail lines and underlayment to wind-driven rain.

Wind blows across miles of open water on Lake Winnebago and Lake Butte des Morts before it reaches homes along the shore and the rivers. Three-tab shingles and aging roofs from the 1990s and 2000s lose their seal strength over time, and summer straight-line winds across the Fox Valley finish the job. Our short warm season matters too. Shingles installed in cold weather may never seal properly unless they're hand-sealed or fastened correctly.

• Shingles or tab pieces in the yard after a storm
• Horizontal creases across shingle tabs
• Exposed black underlayment or bare decking
• Shingles that flap or lift on windy days
• New leaks after wind-driven rain

This damage is concentrated on Menominee Park and Millers Bay homes, the Lake Butte des Morts shoreline, Black Wolf lakefront properties and riverfront cottages along the Fox and Wolf rivers. Exposed corner lots in Westhaven see it too.

Our fix: We replace damaged shingles with matching ones, hand-seal the tabs, re-nail to the manufacturer's high-wind pattern and check nearby courses for broken seals.

Flashing is the metal that seals the joints where a roof meets a chimney, wall, dormer, skylight or vent pipe. When it lifts, corrodes or loses its sealant, water gets behind it. These leaks often show up some distance from where the water actually gets in.

The freeze-thaw cycles in March, April and November make the metal, masonry and sealant expand and contract every day, and old caulk cracks under that strain. Victorian and bungalow homes in Oshkosh have lots of brick chimneys, dormers and wall intersections, and many were flashed decades ago with roofing cement instead of proper step and counter flashing. Mortar joints on old chimneys also deteriorate, which lets water in above the flashing line.

• Stains on the ceiling or wall beside a chimney
• Water marks around skylight frames
• Rusted, bent or loose metal at roof joints
• Cracked mortar or missing counter flashing on the chimney
• Tar or caulk patches layered over flashing
• Drips during heavy rain but not light rain

This is very common in the Washington Avenue Historic District and the UW Oshkosh campus neighborhood, where turn-of-the-century homes have multiple chimneys and dormers and decades of patch-over repairs.

Our fix: We remove the failed material and install new step, counter and apron flashing, cutting reglets into the masonry where needed. Skylights get new flashing kits or are resealed.

Hail can crack the fiberglass mat inside a shingle and knock off the protective granules, even when the roof looks fine from the ground. Bruised shingles age quickly under UV exposure and freeze-thaw cycling. Leaks often appear months after the storm.

Severe thunderstorms roll across the Fox Valley from May through August and bring hail, damaging winds and the occasional tornado warning. Most homeowners never get on their roofs, so the bruising goes unnoticed. Storm chasers also show up after these events and push quick claims, which is why Wisconsin passed Statute 100.65 to regulate contractor conduct on insurance work.

• Granules piling up in gutters or at downspout outlets
• Dark spots where granules are missing
• Dents in gutters, vents or metal flashing
• Soft or cracked spots on shingles
• Neighbors getting roofs replaced after the same storm

Hail and wind events often hit the newer subdivisions in the Town of Algoma, Nekimi, Fox Crossing and Neenah all at once. Many of those architectural-shingle roofs are already near the end of their first life cycle.

Our fix: We document the damage with photos, explain whether it supports a claim and handle repairs or replacement within Wisconsin's storm-contractor rules. We never waive deductibles.

Many older homes have two or more layers of shingles nailed over the original plank or board decking. The extra weight, trapped moisture and nail damage hide rot. Code limits on roof layers mean the next replacement requires a full tear-off.

Oshkosh's housing boom after the 1875 fire left thousands of homes with spaced plank decking. Over the decades, owners kept roofing over the old layers to save money. Under heavy, wet snow loads, a sagging, rotted deck hidden beneath those layers becomes a structural concern, and nails driven into split planks won't hold new shingles against lake wind.

• Visible sagging or waviness along the roof plane
• Thick, stepped edges at the eaves showing multiple layers
• Soft or spongy spots when walked on
• Daylight through the decking in the attic
• Shingles that won't stay nailed down

This is typical of the Victorians, Italianates and bungalows in the Washington Avenue area, along Algoma Boulevard and near downtown, as well as rental conversions around UW Oshkosh where maintenance has been put off.

Our fix: We do a full tear-off, replace rotted planks, add plywood or OSB sheathing where needed, then install ice and water shield, underlayment and new shingles.

When an attic can't exhaust warm, moist air, that moisture condenses on the cold underside of the roof deck. In winter it freezes into frost. When the frost melts it drips onto insulation and ceilings, and over time it rots the decking and shortens shingle life.

Oshkosh's humid summers and long, cold winters create big temperature and moisture swings in the attic. Older homes often have blocked soffits, missing ridge vents or bathroom fans that vent straight into the attic. Shaded, tree-lined blocks also keep roofs damp longer, which encourages moss and algae streaking on north-facing slopes.

• Frost or ice on attic nails and the roof deck in winter
• Musty attic smell or dark staining on rafters
• Curling or blistering shingles at a young age
• Dark algae streaks or moss on shaded slopes
• High summer cooling bills and hot upstairs rooms

We find this most often in 1950s–70s ranches and Cape Cods in South Park and Westhaven, and in the shaded older blocks around Stevens Park and the campus area.

Our fix: We balance the intake and exhaust ventilation with soffit, ridge or box vents, reroute exhaust fans and flag insulation gaps that are driving moisture and ice dams.

Flat and low-slope roofs on porches, additions, garages and commercial buildings rely on membranes like EPDM, TPO or modified bitumen. Seams, penetrations and ponding areas fail first. Water can travel a long way under the membrane before it shows up inside.

Heavy, wet snow sits on low-slope roofs around Oshkosh for weeks, and melt cycles leave standing water that freezes and thaws over and over. Commercial and industrial buildings tied to local manufacturing and the paper industry in Neenah and Menasha cover large membrane areas, where a single failed seam can damage inventory or equipment.

• Standing water 48 hours after rain or melt
• Bubbles, blisters or wrinkles in the membrane
• Open or lifting seams at laps and edges
• Ceiling tiles stained or sagging inside
• Cracked sealant around HVAC curbs and drains
• Ice buildup around roof drains in winter

Common on porch roofs and rear additions in older Oshkosh neighborhoods, flat-roofed downtown storefronts and commercial and light-industrial buildings in Oshkosh, Neenah and Menasha.

Our fix: We find the leak, patch or re-seam the membrane, improve drainage at ponding spots and recommend coatings or full TPO/EPDM replacement when the system has worn out.