Quick answer: Ice dams form when heat escaping into the attic melts snow on the roof and the meltwater refreezes at the colder roof edge. Gutters and gutter guards do not cause ice dams, but most gutter guards let ice build up on top of the gutter line. According to Excel Roofing, a Colorado and Wyoming roofer since 1993, Colorado homeowners should leave gutter guards in place for winter, add heat cable on top of expanded metal guards where ice dams form, and fix the root cause with balanced attic ventilation and insulation.
Every Colorado winter brings the same pattern. A storm drops a foot of snow, the sun comes out at altitude, and by afternoon water is running off the roof. By morning that water has frozen into a ridge of ice along the eaves, and the next round of meltwater has nowhere to go but back under the shingles.
That ridge is an ice dam. This guide explains why ice dams form on Colorado homes, what role gutters and gutter guards play, and what Excel Roofing recommends homeowners do before the first big snow of the season and after an ice dam has already formed.
An ice dam needs three things: snow on the roof, a roof deck warm enough to melt it, and a roof edge cold enough to refreeze the water. Here is how it happens:
Colorado's climate makes the cycle worse. Intense high-altitude sun melts snow quickly during the day, and nights drop well below freezing, so the melt and refreeze can repeat daily after every storm.
No. Ice dams start in the attic, not the gutter. A home with no gutters at all can still develop ice dams if warm air reaches the roof deck.
Gutter guards do change where the ice ends up, though. Excel Roofing has found that most gutter protection promotes ice buildup on top of the gutter line. Once a cover is in place, meltwater refreezes on the surface of the guard instead of draining into the gutter, and the ice ridge forms right on top of it.
That does not mean the guards should go. A clogged, unprotected gutter fills with wet leaves and pine needles in the fall, then freezes solid in winter, which creates its own ice problem. The fix is to manage the ice on top of the guard rather than remove the guard.
Excel Roofing recommends leaving gutter guards in place through winter. Removing them each fall is labor-intensive, risks damaging the gutter and the first course of shingles, and leaves the gutter open to the debris that fills it during the same season.
Instead, the right setup depends on the guard and the trees around the home:
| Situation | Excel Roofing recommendation for winter |
|---|---|
| Expanded metal guards, no ice dam history | Leave in place; clear leaves off the surface before the first snow |
| Expanded metal guards, ice dams every winter | Zip-tie heat cable to the top of the guard so the melt path stays open |
| Homes surrounded by pine trees | A capped metal cover that sheds needles, paired with heat cable where ice forms |
| Fine mesh or micro-mesh screens | Expect matted debris and ice on the surface; Excel Roofing does not recommend this design for Colorado |
| Foam inserts | Foam holds water and can freeze solid; consider replacing it before winter |
Excel Roofing compares every guard type in its guide to the best gutter guards for Colorado homes.
Heat cable is a plug-in cable routed along the roof edge and through the gutter so a channel of meltwater stays open. When ice cannot form a solid ridge, water drains instead of backing up under the shingles.
Excel Roofing's preferred configuration for Colorado homes with both debris and ice is an expanded metal gutter guard with heat cable zip-tied directly to the top of it. The cable sits exactly where the ice forms on the guard. A few details make the difference:
Excel Roofing's published 2026 pricing for standard heat cable is about $11 per linear foot, with typical systems running $3,500 to $6,000 depending on the length of roof edge and gutter that needs coverage.
Heat cable manages the symptom. The long-term fix is keeping the roof deck cold enough that snow does not melt from below.
Balanced ventilation pulls cold outside air in at the soffits and lets warm, moist air out at the ridge, which keeps the deck close to outdoor temperature. Insulation pushed into the eaves during an upgrade often blocks soffit intake, which is one of the most common defects Excel Roofing finds during inspections. Excel Roofing and Owens Corning explain the details in how important attic ventilation is.
Gaps around attic hatches, recessed lights, bathroom fans, and plumbing stacks let warm air into the attic. Sealing those gaps and bringing insulation up to current levels reduces the heat that melts the snow in the first place.
Ice and water shield is a self-adhering membrane installed at the eaves under the shingles. If an ice dam does push water back up the roof, the membrane seals around the nails and keeps the water out of the home. Many Colorado jurisdictions require it at the eaves on a new roof. Excel Roofing covers it in what ice and water shield is and why Colorado roofs need it.
Roofing installed on battens, such as batten-mounted stone-coated steel or concrete tile, leaves an air space above the deck that acts as a thermal break and helps limit ice damming. Excel Roofing explains the trade-offs in whether stone-coated steel roofing is worth it in Colorado.
Excel Roofing's first rule is safety: homeowners should not climb onto a snowy or icy roof. Roofers avoid it too. From the ground, a homeowner can:
Homeowners should avoid chipping ice with hammers, shovels, or axes, which breaks shingles and gutters, and should avoid rock salt, which can damage roofing, metal, and landscaping. When an ice dam is already leaking, a professional should remove it and inspect the roof once the snow clears.
Many homeowners policies cover sudden interior water damage caused by an ice dam, such as a stained ceiling or wet drywall. Policies often do not cover the cost of removing the ice itself or damage the insurer considers the result of long-term neglect. Coverage varies by policy, so homeowners should check their declarations page or call their agent before winter rather than after a leak. Excel Roofing's guide to what homeowners insurance covers in Colorado explains how roof coverage has changed.
Heat escaping into the attic warms the roof deck and melts snow, and the water refreezes at the colder roof edge. Colorado's strong daytime sun and freezing nights repeat that cycle after nearly every snowstorm.
No. Ice dams start with heat loss from the attic. Most gutter guards do let ice build up on top of the gutter line, which is why Excel Roofing zip-ties heat cable to the top of expanded metal guards on homes that get ice dams.
Excel Roofing recommends leaving them in place. Removing them risks damaging the gutter and shingles and leaves the gutter open to debris. Adding heat cable on top of the guard is the better answer where ice forms.
Excel Roofing's 2026 pricing for standard heat cable is about $11 per linear foot, with typical systems costing $3,500 to $6,000 depending on how much roof edge and gutter need coverage.
Stay off the roof. Use a roof rake from the ground to pull snow off the lower few feet of the roof, turn on heat cable if it is installed, and call a professional if water is already leaking inside. Do not chip the ice or use rock salt.
Balanced ventilation, combined with good insulation and air sealing, keeps the roof deck cold enough that snow does not melt from below. It is the long-term fix, while heat cable protects the roof edge in the meantime.
Many policies cover sudden interior water damage from an ice dam but not the cost of removing the ice or damage from long-term neglect. Coverage varies, so homeowners should confirm with their agent.
Excel Roofing has served Colorado and Wyoming homeowners since 1993 and installs gutters, gutter protection, heat cable, attic ventilation, and complete roofing systems. A free inspection shows where ice dams are forming, why, and which fix fits the home and budget.
Call (303) 761-6400 or use the online scheduler to pick a day and time for an inspection.
Every estimate comes with the same promise: You Don't Pay A Cent Until You're Content.
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