Ice Dam Removal and Prevention: How to Stop Ice Dam Roof Leaks
Short answer: Ice dam removal starts with taking weight and water off the roof: rake snow from the lower roof from the ground and, in an emergency, cut channels so trapped water can drain. Lasting ice dam prevention means stopping warm air and heat from reaching the attic with air sealing and insulation.
Ice dams are the reason a ceiling stain can appear in February even when no pipe has burst. Meltwater backs up behind a ridge of ice at the roof edge, works under the shingles and drips into the attic, the walls and the ceiling. If water is already coming inside, get help with ceiling and roof leak water damage in Littleton; Reestorian can connect you with a local provider. Then come back to fix the cause.
This is general information. Roof work is dangerous, so hire a roofer or a weatherization contractor for anything on a ladder or roof.
What is an ice dam on a roof?
The University of Minnesota Extension describes an ice dam as a ridge of ice at the edge of a roof that stops melting snow from draining off. Three things have to happen at once:
- There's snow on the roof.
- The upper roof is above freezing, usually because heat from the house warms the roof deck.
- The lower roof edge is below freezing, because the eaves stick out past the warm walls.
Snow melts on the warm part of the roof, the water runs down to the cold eave and refreezes. The ridge of ice grows with each melt, and the water behind it has nowhere to go but under the shingles.
The Extension says heat from the house is the main cause, and that air leaking through ceiling openings into the attic is the biggest path for that heat in many homes.
Signs of an ice dam roof leak
- Thick ice along the eaves and gutters, often with long icicles
- Water stains or peeling paint on ceilings and walls along exterior walls
- Wet or matted attic insulation near the eaves
- Damp spots or drips around windows and door frames below the roofline
- Frost or water on the underside of the roof deck in the attic
Water dripping from the ceiling during a thaw? Call to reach a local ceiling water damage provider.
Call (928) 394-5135How do you remove ice dams safely?
| Method | How it works | Cautions |
|---|---|---|
| Roof rake from the ground | Pulls snow off the lower roof so less meltwater reaches the eave | The Extension notes roof rakes can damage roofing; stay on the ground and watch for power lines |
| Drainage channels | Cuts a path through the dam so trapped water can drain | The Extension suggests hosing with tap water on a warm day, working up from the lower edge; channels last only days |
| Professional steaming | Low-pressure steam melts channels without tearing shingles | Hire an experienced roofer or ice dam company |
| Heat cable | Keeps a melt path open along the edge | Treats the symptom, not the cause |
What to avoid: chipping ice with a hammer, ice pick or shovel, which tears shingles and gutters; climbing on an icy roof; and using rock salt, which can damage roofing, gutters and plants.
How to prevent ice dams on your roof
The Building America Solution Center, run by Pacific Northwest National Laboratory, lists three ways to prevent ice dams, in order of importance.
1. Air seal the attic floor
Sealing the ceiling plane is the most important step. Warm air leaks into the attic through:
- Top plates of interior and exterior walls
- Recessed can lights
- Attic hatches and pull-down stairs
- Chimney and furnace flue chases
- Plumbing stacks and electrical wiring holes
- Bath and kitchen exhaust fan housings
2. Add insulation
Once leaks are sealed, adequate attic insulation slows heat loss to the roof deck. Keep insulation out of the soffit vents so air can still move.
3. Ventilate the roof deck
Soffit intake vents and ridge exhaust vents move cold outdoor air along the underside of the roof deck, keeping it closer to outdoor temperature. Baffles keep insulation from blocking the vents. The Extension adds that if air sealing is done well, only a small amount of ventilation is needed.
A weatherization contractor can run a blower door test and use an infrared camera to find where heat is escaping, as the Extension suggests.
Protect the roof edge when you re-roof
The Building America Solution Center recommends a self-adhered membrane, often called ice and water shield, along the eaves as a secondary layer against leaks. Building codes often require it. If you're replacing a roof in Colorado, ask your roofer about it. Under C.R.S. § 6-22-103, a residential roofing contract must be in writing, include a 72-hour cancellation right and state that the contractor can't waive your insurance deductible.
Why ice dams happen in Littleton
Littleton averages about 65 inches of snow a year, and Colorado winters swing between snowstorms and sunny thaws. Those freeze-thaw cycles are exactly what builds ice dams. Homes with complex rooflines, low-slope sections over porches, vaulted ceilings with little room for insulation, and recessed lights in the top-floor ceiling are the most likely to get them.
Dealing with water damage from ice dams
Wet attic insulation can hold water for a long time and keep the ceiling below damp. The EPA says mold usually won't grow if wet materials are dried within 24 to 48 hours, so act quickly:
- Catch drips and move belongings away from the wall
- Photograph the ceiling, walls and the ice from outside
- Check the attic for wet insulation, if you can do it safely
- Call for help to dry or remove wet insulation and drywall
- Fix the heat loss before you repaint, or the stain will return next winter
See water damage on the ceiling for how ceiling repairs work.
Local note: Ice dams are most common where snow stays on the roof. In Ken Caryl and Castle Rock, higher elevations bring heavier, longer-lasting snow. In Highlands Ranch and Greenwood Village, vaulted ceilings and complex rooflines are common trouble spots.
Related reading: Learn the signs of hidden water damage in walls and ceilings, and what to do about water damage on a ceiling.
When should you call a water damage professional?
Call a roofer for the ice and the roof. Call a water damage professional when:
- Water is dripping through a ceiling or running down a wall
- Attic insulation is wet or matted
- Drywall is stained, soft or sagging
- You smell mustiness after a thaw
Ice dam leaking in Littleton? Call (928) 394-5135 to reach a local ceiling water damage provider.
Frequently asked questions
Can I chip ice dams off with a hammer or ice pick?
It's not a good idea. Chipping can tear shingles, damage gutters and put you at risk of falling. Safer short-term steps are raking snow from the lower roof from the ground or making drainage channels through the dam.
What's the best way to eliminate ice dams for good?
Stop the heat that melts the snow. The University of Minnesota Extension says air leaking into the attic is the main cause in many homes, so air sealing the ceiling, then adding insulation and keeping the roof deck ventilated, is the lasting fix.
Do heat cables prevent ice dams?
Heat cables along the roof edge can keep a drainage path open, but they don't fix the cause, which is heat escaping into the attic. Air sealing and insulation address the source.
Are ice dams covered by homeowners insurance?
Water damage inside the house from an ice dam is often covered as sudden damage, but policies vary. The cost to remove the ice or fix attic insulation is usually treated as maintenance. Check your policy and photograph damage right away.
How soon can mold start after an ice dam leak?
The EPA says mold usually won't grow if wet materials are dried within 24 to 48 hours. Wet attic insulation and ceiling drywall can hold water much longer, so they often need professional drying or removal.
Sources
Related guides
Water Damage on the Ceiling: Causes, Repairs and What to Do Next
What a ceiling stain or sag means, how to find the source and how a water-damaged ceiling gets repaired.
Signs of Hidden Water Damage in Your Home
The subtle signs of water damage behind walls, under floors and above ceilings, and a room-by-room way to check.
Ice dam leaking into the house?
Call to reach a local provider for ceiling and wall water damage in Littleton.