The short answer
Common Causes After Snowfall
Snow on your roof can melt unevenly. Heat escaping from your living space warms the attic, which melts the snow directly above it. That meltwater runs down the roof slope until it hits colder eaves, where it refreezes into an ice dam. Water then backs up under the shingles and drips into the attic.
Another cause is wind-driven snow that gets pushed up under roof vents or ridge caps. Heavy snow can also pile up in valleys or around chimneys, where it melts and seeps through flashing that has lifted or cracked. Look for wet spots near the roofline, around vents, and at the top of exterior walls.
Signs You Have an Ice Dam
Ice dams form when snow on the upper roof melts and refreezes at the colder eaves. You may notice icicles hanging from the gutters, or a visible ridge of ice along the roofline. Inside the attic, check for water stains on rafters, a damp sheen on the underside of roof sheathing, or drips that follow the slope of the roof.
If you see water stains that follow a straight line across the ceiling, that is a strong clue that an ice dam is pushing water under the shingles. Act quickly, because standing water can soak insulation, rot wood framing, and promote mold growth. The pros can help you remove snow safely and stop further leakage.
How to Respond Right Away
First, clear snow from the lower few feet of the roof using a roof rake, if you can do so safely from the ground. Removing snow near the eaves helps break the dam and lets water drain. Do not use a hammer or sharp tool on the ice, as that can damage shingles.
Inside the attic, place a bucket under active drips and consider using a fan to improve air movement. Keep the attic warmer than freezing, but do not turn the heat up too high, as that can melt more snow and worsen the leak. If you cannot reach the area safely, call local water damage pros for help with extraction and drying.
- Clear snow from the roof with a long-handled rake
- Use a plastic shovel, never metal tools that can scratch shingles
- Remove ice from gutters by hand, not with an axe
- Set up a bucket or tarp under active drips
- Open attic vents to let moisture escape
- Check for wet insulation and remove it if saturated
When to Call the Pros
If you see water stains, sagging drywall, or soaked insulation, the damage may be more than a simple dry-out. Wet insulation loses its R-value and can harbor mold if left damp. The pros can remove wet insulation, dry the structure, and repair any damaged wood or drywall.
You should also call if you cannot safely access your roof or attic. Snow and ice create slippery conditions, and ladder work is risky. A professional inspection can find the exact entry point, whether it is a nail hole, a cracked vent boot, or a worn rubber seal around a pipe. Ask about moisture mapping to pinpoint hidden leaks.
Prevent Future Snow Leaks
The most effective way to prevent ice dams is to keep your attic cold. Seal any gaps where warm air from your living space can rise, such as around light fixtures, vents, and attic hatches. Add insulation on the attic floor to slow heat transfer from below.
Also inspect your roof for loose or missing shingles before the next snowfall. Clean gutters in late fall so meltwater can flow freely. If you live in a cold climate, keep an eye on the weather forecast and act before a heavy snowstorm hits. For persistent issues, a moisture-mapping service can show where heat and moisture are entering.
- Seal air leaks around pipes and wires with caulk or foam
- Add attic insulation to at least the recommended depth
- Install a vapor barrier on the warm side of the insulation
- Clean gutters and downspouts every autumn
- Trim tree branches that overhang the roof
- Consider roof ventilation to keep the surface cold
Water damage does not wait
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (313) 766-2970Frequently asked questions
Is a wet attic after snow always a leak?
Not always. Condensation can form when warm, humid air from your home reaches the cold attic surfaces. That looks like a leak but is usually a ventilation or insulation problem. Check for water dripping from nails or the underside of the roof deck, which points to condensation.
Can I dry the attic myself?
You can dry small areas with fans and dehumidifiers, but soaked insulation needs removal. Wet fiberglass loses its shape and insulating value, and it can stay damp for weeks. For large areas, local water damage pros can extract water and set up industrial drying equipment to prevent mold.
Will my insurance cover attic water damage?
Policies vary, and your insurer decides what is covered. Snow or ice dam damage is often covered under homeowners insurance, but it depends on the cause and your specific policy. Contact your insurance company soon, and take photos of the damage before any cleanup. Check your policy for details.