SEASONAL

Winter Roof Problems: 6 Issues We See Every Year in the SW Suburbs

By AJ Roofing | April 2, 2026 | Southwest Suburbs of Chicago

Illinois winters are hard on roofs in ways that homeowners in milder climates never have to think about. After years of responding to winter-related roof problems across Orland Park, Tinley Park, Naperville, and the surrounding suburbs, AJ Roofing sees the same six issues appear every season. Here's what they are, what causes them, and what to do if you're dealing with any of them.

1. Ice Dams

Ice dams form when heat escaping from your living space warms the upper roof deck, melting snow that refreezes at the cold eave zone. The resulting ice ridge traps meltwater that then forces its way under shingles and into your home. It's the most common and most damaging winter roof problem in our climate.

Damage from ice dams includes water staining on ceilings, damaged insulation, and mold growth. Professional steam ice dam removal is the only safe method — mechanical chipping damages shingles, and salt causes corrosion.

2. Attic Condensation and Moisture Buildup

Even without an active leak, Illinois winter attics can develop significant moisture problems. Warm, humid air from the living space infiltrates the attic through gaps around light fixtures, plumbing penetrations, and attic hatches. When this air contacts cold roof decking and rafters, it condenses — depositing moisture that promotes mold, stains, and eventually structural damage to roof sheathing.

Signs include frost on the underside of the roof deck visible from inside the attic, water staining on rafters, and musty odors from the attic space. A properly air-sealed and ventilated attic prevents this. If you see frost in your attic this winter, schedule a professional inspection in spring to assess what corrective work is needed.

3. Flashing Failure from Freeze-Thaw Cycling

Metal flashing — the thin metal strips that seal transitions between roofing and walls, chimneys, skylights, and valleys — expands and contracts with temperature changes. In Illinois, where temperatures can swing from -10°F to above freezing within a single week, this cycling is extreme and continuous. Over time, the caulk and sealants that seal flashing joints harden, crack, and fail.

Failed flashing is a primary cause of winter leaks that are mistakenly attributed to ice dams. If you have interior water damage near a chimney, skylight, or dormer, flashing failure is often the culprit. Flashing repairs require removing and resetting the metal properly — not just caulking over the existing condition. Call AJ Roofing for roof repair at any flashing location showing signs of failure.

4. Flat Roof Ponding and Membrane Failure

Flat roofs — common on commercial buildings and residential additions — face unique winter challenges. Snow accumulation creates substantial weight loads, and the freeze-thaw cycle at seams and penetrations stresses the membrane material. When snow melts and water can't drain (due to clogged drains or low points in the roof surface), ponding occurs. Standing water beneath snow contributes to membrane failure at seams.

Monitor flat roofs during and after snow events. If drains are clogged or you observe standing water after melt, clearing the drainage pathway promptly prevents more serious damage. Any signs of interior leaks from a flat roof area warrant immediate inspection before the next freeze cycle forces more water through the failing membrane.

5. Gutter Ice Backup

Gutters that weren't cleaned before winter hold debris that creates blockages. When snow melts and refreezes in a clogged gutter, the ice expands and forces the gutter away from the fascia. This mechanical stress can pull gutter fasteners out of the fascia board entirely, requiring both gutter repair and fascia repair before spring.

The ice in backed-up gutters also contributes to ice dam formation at the eave — ice in the gutter creates a barrier for water draining from the roof, accelerating the dam-building process. Clean gutters before winter is the prevention. If yours are already iced up, wait for a thaw rather than trying to chip ice out mechanically — you'll damage the gutter or the fascia.

6. Shingle Cracking from Thermal Shock

Asphalt shingles become brittle in very cold temperatures. When temperatures drop below 0°F — which happens in the SW Suburbs during most winters — shingles lose flexibility and become vulnerable to cracking from physical stress. Foot traffic on a frozen roof, heavy snow sliding off, or even thermal contraction can crack already-aging shingles at this stage.

This is particularly an issue for shingles approaching the end of their service life. A roof that's performed fine through moderate winters may crack significantly in an unusually cold season. After a polar vortex event, if your roof is 15+ years old, a spring inspection is a reasonable precaution to check for new cracking that wasn't there before the cold snap.

DIY vs. When to Call a Pro

Some winter roof tasks are reasonable for homeowners: using a roof rake from the ground to reduce snow load before ice dams form, cleaning gutters in late fall as prevention, and monitoring the attic for frost or moisture. Most actual repair work — anything that involves getting on the roof, cutting into the system, or replacing flashing — warrants a professional in winter conditions. Cold surfaces are slick, damage can be worse than it appears from below, and improper winter repairs can create new problems that surface in spring.

AJ Roofing handles winter emergencies across all SW Suburbs communities. If you're dealing with an active winter roof problem, call us before the next freeze cycle makes it worse.