An ice dam forms when snow on the roof melts from underneath, runs down to the cold eave, and refreezes into a ridge. That ridge holds back later meltwater, which can work under the shingles and reach ceilings and walls. In Columbus this happens most often from January through March, and the stain shows up inside the house, so the first job is to stop the water and dry the area quickly.
Key takeaways
- An ice dam is refrozen meltwater at the roof edge, and it forces water back under the shingles instead of letting it drain off.
- Freeze-thaw cycles on a snow-covered roof are the mechanism, so the risk rises and falls with the weather rather than with the calendar alone.
- Columbus roofs most at risk are low-slope rear additions and shallow-eave roofs on older housing, which is common across the city's pre-war stock.
- Stains, bubbling paint and drips near exterior walls or light fixtures are the usual signs that water has come through from the roof.
- Heat leaking from living space into the attic is often what melts the snow from below, so insulation and ventilation can be part of the cause.
- Drying within 24 to 48 hours, as EPA guidance recommends, is what limits mold, and the crew can set up that drying after the water is stopped.
What is an ice dam, and why does it form?
An ice dam is a ridge of ice that forms at the roof edge and stops meltwater from draining. The water that backs up behind it can get under the shingles and into the roof structure. The cause is uneven temperature across the roof surface.
Snow lying on a roof does not melt evenly. Heat from the living space below warms the underside of the roof deck, so the snow nearest the attic melts, and that water runs down toward the eave. The eave overhangs the wall and sits outside the warm zone, so it stays below freezing. The water reaches that cold edge and freezes, and each layer adds to the ridge.
Once the ridge is tall enough, the next melt has nowhere to go. It pools behind the ice and works its way up under the shingles, following nail holes, flashing and any gap where the roof meets a wall or chimney. The water does not need to pour through to cause damage. It only needs to soak the sheathing and insulation long enough to reach a ceiling. That is why the leak can appear hours or days after the snowfall that started it.
When does the risk peak in Columbus?
In Columbus the risk runs through the cold months, typically January to March, with the normal last 32°F falling on 18 April. Ice dams need both snow on the roof and a freeze-thaw pattern, so a mild winter with little snow carries less risk.
The National Weather Service's Wilmington office publishes the normal freeze dates for Columbus. The normal first 32°F is 27 October, and the normal last 32°F is 18 April, with a late-season freeze still possible after that. The normal seasonal snowfall is about 28.2 inches. Those are averages, and the Weather Service cautions that temperatures vary across an area because of topography, urban setting and where instruments sit. So a roof on one street may refreeze while the next one does not.
The pattern that matters is the thaw. A week of cold with snow, followed by a few days above freezing and then a hard drop, produces the most ice on the eaves. Homeowners often notice the leak on the warm-up after a cold stretch, not during the cold itself. Watching for the first warm spell after heavy snow is a practical habit, and checking the ceiling under the roof edge after that thaw can catch a problem early.
What does a winter roof leak look like from inside?
The first sign is usually a stain on the ceiling along an exterior wall, at the top of a room, or near a light fixture. Paint may bubble, and drywall can soften or sag. Dripping after the thaw is a strong signal that the water came from the roof rather than a plumbing line.
Ice dam leaks tend to follow the structure. The stain often sits along the top of an exterior wall, in a corner where two walls meet the ceiling, or in a room directly under a rear addition. In older houses with plaster, the ceiling may crack or the plaster may lift in a band. In newer rooms with drywall, the tape seams can show a yellow or brown line before the paint fails. A drip at a recessed light is a common early sign because the fixture carries the water down.
Some signs are easy to miss. Frost or ice visible on the outside of the eave, icicles in a long row along the gutter, or a patch of wet insulation in the attic can all point to the same cause. Check the attic if there is access, looking at the underside of the roof deck and the insulation near the eaves. If the wood is dark, damp or stained, water has already got in, even if the ceiling below looks fine.
Is it a roof problem or an attic problem?
It can be either, and often both. A roof problem is a gap or failure in the shingles, flashing or underlayment that lets water through. An attic problem is heat escaping from the living space and melting the snow, which then creates the ice. Sorting out which one applies is a job for a roofer and, if the attic is involved, for an insulation or ventilation contractor.
The attic side is about heat. When warm air from below reaches the roof deck, it melts snow from underneath even on a cold day. Gaps around light fixtures, bath fans, attic hatches and wall plates let that warm air rise. Insulation and ventilation are meant to keep the roof deck close to the outside temperature, so the snow stays put until it melts normally. A house whose attic is poorly insulated or closed off often produces ice dams where its neighbors do not.
The roof side is about water getting in. Missing or lifted shingles, damaged flashing around a chimney, and worn underlayment at valleys can all let meltwater through even without much ice. Repairing shingles and flashing is roofing work. Replacing a roof is outside what this company offers. The water cleanup and drying that follow a leak, whichever side caused it, is the work this company's crew does.
What should you do in the first hours after you see water?
Stop the water if you can do it safely, move belongings out of the wet area, and protect the rest of the house. Photograph the damage before anything is moved or cleaned. Keep away from light fixtures and outlets in wet areas, and turn off power to that section if it is safe to reach the panel.
Water near electrical fixtures is a real hazard, so the first step is to stay clear of it. If a ceiling fixture is dripping, do not touch it. Switch off the circuit at the panel if you can reach it without standing in water, and call an electrician if the wiring is involved. Place a bucket or tarp under the drip, and move furniture, rugs and electronics out of the way. Clear the drip path rather than trying to fix the roof from a ladder in winter.
Take photos and video of the ceiling, walls, floor and any stained materials before cleaning. Note the time you first saw the water and whether it is still coming in. Your insurer will want that record. Then call a restoration company. The crew can extract standing water, set up air movers and dehumidifiers, and check for moisture behind walls with meters and thermal imaging. Drying quickly is what keeps a manageable leak from turning into a mold problem, and EPA guidance points to drying wet materials within 24 to 48 hours.
What does the crew do, and what does it not do?
The crew handles the interior water damage and drying, and it can place emergency tarping or board-up over an opening so more water cannot get in. The crew does not replace roofing, does not repair the attic insulation or ventilation, and does not fix plumbing. Those jobs go to the right trade.
The emergency stage usually means extracting water, removing wet materials that cannot be saved, and setting drying equipment. The crew checks readings until the structure is dry, then it can document the damage with moisture readings and photos for your insurer. Repairs such as drywall, trim and flooring are quoted separately after someone has seen the wet area. The price is confirmed on site before any work begins.
Some work sits outside the crew's scope. A missing shingle, a cracked flashing or a worn valley needs a roofer. Insulation and attic ventilation changes are a separate job. If the leak came from a supply line feeding the attic, that is plumbing work and needs a licensed plumber. In Columbus, plumbing is licensed in Ohio, and city building departments handle residential registration, so ask any plumber which license they hold and check it with the issuing office. If you want a sense of how the cleanup is scoped, the cost guide explains what moves a quote.
How does insurance usually treat ice dam damage?
A standard homeowners policy generally responds to sudden and accidental water damage, and generally does not cover long-term or gradual leaks. Whether a particular ice dam leak is covered depends on your policy and on how the damage happened. Check your policy and ask your agent.
Insurers look at the pattern of the damage when deciding how a leak happened. A sudden discharge is treated differently from water that has been seeping for months, and insurers can ask how long the damage has been going on. Ice dam leaks sit in the middle, so the wording of your policy and the facts of your loss decide the outcome. Coverage is not something a cleanup company can promise, and the crew does not handle your claim.
What the crew can provide is documentation. Moisture readings, photos and a description of what was removed and dried can go to your insurer. Keep your own photos and receipts too. If you have a dispute about how a claim was handled, the Ohio Department of Insurance takes consumer complaints at 800-686-1526, though it does not settle disagreements about what the damage is worth. For a broader look at how claims work in Ohio, see the Ohio insurance guide when it is published.
Frequently asked questions
Can I knock the ice off my gutters or roof edge myself?
Climbing a ladder onto a snowy or icy roof is risky, and chipping at ice can damage shingles and gutters. The safer approach is to stop the water inside and keep the area dry. If you need the roof edge cleared, a roofer is the right person to ask. Do not use tools near electrical service lines.
Does a leak from an ice dam always mean my roof is failing?
Not always. An ice dam can form over a roof that is in good condition when heat from the attic melts snow from below. Insulation and ventilation can be part of the cause. A roofer can check the shingles and flashing, and an insulation contractor can look at the attic. Often both play a role.
How quickly does ice dam water cause mold?
EPA guidance says to dry water-damaged areas and items within 24 to 48 hours to prevent mold. Mold can start on wet drywall, insulation and wood fairly quickly. A small patch under about 10 square feet can sometimes be cleaned by a homeowner, but larger areas, or mold in the attic or heating system, call for professional help. Mold can trigger allergy and asthma symptoms in some people.
Will the crew fix my roof or replace my shingles?
No. The crew handles the interior water damage, drying, and emergency tarping or board-up over an opening so more water cannot get in. Shingle repair and roof replacement are roofing work. Ask a roofer to look at the roof once the interior is dry or while tarping is in place.
Is the emergency work covered by Ohio's right to cancel?
Ohio law gives homeowners a three-business-day right to cancel many contracts signed at home. Ask the company for the written agreement and the cancellation notice, and check with the Ohio Attorney General's office if you are unsure whether the right applies to an emergency job.
How do I reach the crew, and how fast will it come?
The phone is answered 24/7, and a crew is dispatched as fast as one is available. The number is (833) 490-5225. Ask for the license and certification details at any time on the phone. Arrival times depend on availability, so the team cannot promise one.
Sources
This guide is general information for Franklin County homeowners, not a substitute for an on-site inspection. Prices are estimates. See our disclaimer.