Roofing Contractor in Oshkosh, WI Built for Lake Winnebago Winters

An ice dam is a ridge of ice that forms at the eaves when attic heat melts snow higher on the roof and the water refreezes over the cold overhang. The meltwater pools behind the ice, backs up under the shingles, and leaks into walls, insulation, and ceilings.

Oshkosh gets 40–50 inches of snow plus lake-effect bursts off Winnebago, and the stretch from late fall to early spring brings constant freeze-thaw swings. The real culprit is usually the attic. Thousands of 1940s–1960s Capes and ranches were built with minimal insulation and little ventilation, so heat escapes straight into the roof deck. Older homes built before modern code often have no ice-and-water shield at the eaves at all. The damage stays hidden until stains appear, often in February or March, after weeks of soaked insulation and wet decking.

• Thick icicles hanging from gutters and eaves
• A ridge of ice along the roof edge after snowfall
• Brown ceiling or wall stains near exterior walls
• Peeling paint or bubbling drywall in upstairs rooms
• Frost or damp insulation in the attic
• Snow melting fast on the upper roof but not at the eaves

We see the worst ice damming in post-war Capes on Oshkosh's west side near Sawyer Street, in older neighborhoods around Menominee Park, and in 1950s ranches across Neenah–Menasha and Fond du Lac. Knee-wall attics in story-and-a-half homes are a frequent trouble spot.

First we tarp and steam the ice off safely. Then we fix the cause by adding ventilation, sealing attic air leaks, and installing code-compliant ice-and-water shield when we reroof.

Hail bruises asphalt shingles, knocks off the protective granules, and can crack the mat underneath. Straight-line winds lift shingle tabs, break the seal strips, and tear off shingles, ridge caps, and flashing. All of that leaves the deck open to the next rain.

The Fox Valley gets regular severe convective storms between late spring and summer, including derecho-strength winds and occasional EF0–EF1 tornadoes. The open farmland across Winnebago, Fond du Lac, and Calumet counties gives wind nothing to slow it down before it reaches homes on the edge of town and in rural areas. Lakefront homes take direct gusts off the water. Hail damage is easy to miss from the ground, and that's one reason out-of-state storm chasers move in after a big event.

• Missing, creased, or flipped shingles
• Granules piled in gutters or at downspout outlets
• Dents in gutters, vents, siding, or metal roofing
• Dark circular bruises on shingles
• Lifted or bent flashing and ridge caps
• New leaks right after a storm

Shoreline homes in the Town of Black Wolf, along the Miller's Bay area, and on the Lake Poygan shoreline get hit hardest by wind. Exposed subdivisions on the edges of Fond du Lac, Greenville, and the Town of Harrison see more hail and blow-off claims.

We document the damage with dated photos for your insurance claim, make temporary repairs, and then repair or replace the affected roofing to restore wind ratings and watertightness.

Flashing is the metal that seals the joints where the roof meets chimneys, dormer walls, skylights, and vents. When it corrodes, pulls loose, or was only caulked to begin with, water gets in at the roof's most vulnerable seams.

Oshkosh's older housing has a lot of tall brick chimneys and dormer-heavy rooflines. Many of those chimneys have crumbling mortar, and the flashing has been patched with tar several times over the decades. Expansion and contraction across a 100°F temperature swing gradually breaks down sealant and pulls metal away from masonry. Each freeze-thaw cycle opens the gaps a little wider.

• Water stains on ceilings around the chimney
• Rusted or tar-smeared flashing
• Gaps between flashing and brick
• Crumbling mortar joints near the roofline
• Damp attic framing beside the chimney
• Leaks that show up only in wind-driven rain

This is very common on Victorians and Foursquares near Algoma Boulevard, Washington Avenue, and the College Avenue corridor, and on older homes on Doty Island and in central Fond du Lac. These houses often have several chimneys and complicated dormer intersections.

We remove the old patchwork and install new step and counter flashing cut into the mortar joints. If the chimney needs it, we coordinate tuckpointing or a cricket.

Asphalt shingles lose their oils and granules as they age. They turn brittle, curl, and crack, and they can't shed water or hold up to wind the way they once did. Eventually patching costs more than it's worth.

Much of the suburban growth in the Fox Valley happened in the 1990s and early 2000s, so a large share of roofs in Appleton, Greenville, Kimberly, Little Chute, Neenah, and Fond du Lac are now 20–30 years old. Harsh UV in summer, heavy snow load, and constant thermal cycling wear shingles faster here. Poor attic ventilation, common in mid-century homes, can take years off a roof by baking it from below.

• Curling or cupping shingle edges
• Bald spots where the granules are gone
• Cracked or brittle shingles
• Several repairs needed in recent years
• Sagging lines along the roof deck
• Roof over 20 years old with original shingles

We see clusters of end-of-life roofs in 1990s subdivisions across the Town of Grand Chute, Greenville, Fox Crossing, and Fond du Lac's newer neighborhoods. In many of them, homes built in the same year are all needing replacement within a season or two of each other.

We give an honest assessment of remaining life. When replacement makes sense, we do a full tear-off with ice-and-water shield, synthetic underlayment, and balanced ventilation.

Many older homes have had new shingles laid over old ones. Under those layers there's often original plank or skip-sheathing decking that has been rotted by decades of slow leaks, or has gaps that can't hold modern nails securely.

Oshkosh was the "Sawdust City," and its turn-of-the-century houses were sheathed with rough-sawn boards. Over generations, homeowners saved money with layovers. Code now generally limits roofs to two layers, so those homes need a full tear-off, and the bid has to plan for decking repairs nobody can see until the old shingles come off.

• Wavy or uneven roof surface
• Thick, stepped-looking roof edges
• Soft or spongy spots underfoot
• Daylight visible between attic boards
• Shingle nails backing out
• Roof feels heavy or sags between rafters

This is typical of Queen Annes and bungalows in Downtown Oshkosh, the Lakeside and Sheboygan Street area, and older blocks of Neenah, Menasha, and Fond du Lac. Lake cottages that were reroofed cheaply over the years show it too.

We tear off down to the rafters, replace rotted boards, and install new plywood or OSB sheathing where needed. Possible decking costs are spelled out in your estimate in advance.

EPDM, TPO, and modified-bitumen roofs on commercial buildings, garages, and additions fail at seams, penetrations, and drains. Ponding water and heavy snow speed up membrane breakdown and strain the structure underneath.

The Fox Valley's manufacturing, paper, and commercial buildings depend heavily on low-slope roofs. Wet March snow is dense, and when it piles up on a flat roof with clogged drains, it puts serious stress on older membranes and decks. Thermal cycling shrinks membranes and pulls seams apart, and freeze-thaw turns small punctures into wide splits.

• Water ponding 48 hours after rain
• Blisters, bubbles, or wrinkles in the membrane
• Open or lifting seams
• Interior drips near rooftop units or drains
• Cracked or split flashing at parapet walls
• Visible deck deflection under snow

We service a lot of these on light-industrial and retail buildings along Oshkosh's main corridors, in Fox Crossing and Kaukauna, and on mixed-use buildings in downtown districts. Flat-roof porches and additions on older homes are common problems too.

We repair seams and penetrations, improve drainage, and recoat or replace the membrane with EPDM, TPO, or modified bitumen, depending on the building's use and budget.

Leaves and seed pods from mature trees fill gutters and valleys, which traps water against the roof edge. In shaded, humid spots, algae leaves dark streaks and moss grows in, holding moisture against the shingles.

Older Oshkosh neighborhoods and lakefront lots are full of mature maples and oaks. Humid Fox Valley summers give algae and moss ideal conditions. In winter, clogged gutters make ice dams worse because meltwater has nowhere to go.

• Gutters overflowing in rain
• Black or green streaks on shingles
• Moss clumps on shaded slopes
• Debris piled in valleys
• Sagging or pulled-away gutters
• Water staining on fascia or soffits

This is especially common under the old-growth canopy around Menominee Park, the Algoma Boulevard area, Butte des Morts, and wooded lots near Winneconne and the Chain O' Lakes around Waupaca.

We clean valleys and gutters, treat moss and algae safely, and can install seamless gutters and guards so debris doesn't keep coming back.