Short answer: An ice dam is a ridge of ice that forms at the edge of a roof and traps melting snow behind it. To prevent ice dams on your roof, keep the roof deck cold and give meltwater a warm path off the eaves. That means sealing attic air leaks, adding attic insulation, balancing attic ventilation, installing ice and water shield and adding a roof de-icing system like Thermaline on the edges, valleys and gutters that ice up every year.
Utah homeowners remember the 2022–23 winter. Salt Lake City logged 87.3 inches of snow, its 11th-snowiest season since records began in 1885, and the statewide snowpack broke a record that had stood since 1952 (KSL). That season left plenty of Salt Lake Valley homes with icicles, sagging gutters and ceiling water stains. Even an average winter brings enough storms and sunny thaws to build ice dams on the wrong roof.
PRQ Exteriors is a BBB-accredited, Inc. 500 roofing company and a certified Thermaline installer serving homes and businesses across the Wasatch Front. This guide covers what causes ice dams, why Utah roofs are so vulnerable, how to remove ice dams safely and the ice dam prevention steps that actually work.
Ice dams start inside the house, not on the roof. Attic heat loss warms the roof deck, snow melts from below, and the meltwater runs down to the cold eaves. There it refreezes, and each freeze-thaw cycle makes the dam taller.
Here are the ice dam causes we see most on Utah homes:
|
Cause |
Why it leads to ice dams |
Typical fix |
|---|---|---|
|
Attic air leaks |
Warm air escapes through can lights, bath fans, hatches and plumbing stacks |
Air seal the attic floor |
|
Inadequate attic insulation |
Heat moves through thin or settled insulation and warms the roof deck |
Add insulation to current recommended levels |
|
Poor attic ventilation |
Blocked soffits or missing ridge vents trap warm air under the roof |
Balanced soffit and ridge ventilation |
|
Cold eaves and overhangs |
The roof edge sits outside the heated envelope and stays below freezing |
Heated roof edge such as Thermaline |
|
Valleys and complex rooflines |
Valleys funnel large amounts of snowmelt into one spot |
Heated valley panels, ice and water shield |
|
Clogged or frozen gutters |
Meltwater has nowhere to go and freezes in place |
Gutter heat cable, cleaning, proper slope |
|
North-facing roof edges |
Shaded eaves stay frozen long after the rest of the roof melts |
Targeted roof de-icing system |
In short, what causes ice dams is a warm roof deck above a cold roof edge, with melting snow refreezing at the eaves. ENERGY STAR lists ice dams as a common symptom of attic air leaks and notes that air sealing plus insulation can help prevent them.
Is Utah worse for ice dams than other snowy states? In many ways, yes. Salt Lake Valley winters pair heavy storms with high-altitude sun. Snow melts on the roof by afternoon and refreezes at the eaves overnight, which is exactly how ice dams grow.
Local factors that raise the risk:
That is why ice dams in Salt Lake City show up even on newer roofs. Ice dam prevention belongs on every Utah winter roof maintenance checklist.
Short answer: Yes. Shingles are built to shed water downhill, not hold back standing water. When an ice dam traps meltwater, it backs up under the shingles and causes an ice dam roof leak, often days after the storm.
|
Warning sign |
What it usually means |
|---|---|
|
Thick icicles on gutters |
Meltwater is refreezing at the eaves; an ice dam is likely forming |
|
Ceiling water stains near exterior walls |
Water has backed up under shingles and reached the drywall |
|
Damp or frosty attic insulation |
Warm air is leaking into the attic, or water is getting in |
|
Bent or pulling gutters |
Gutter damage from ice weight, often hundreds of pounds per run |
|
Bare roof patches while neighbors' roofs are snow-covered |
Heat loss through the attic is melting snow from below |
|
Peeling paint or stains on exterior walls |
Ice dam water damage running behind siding or soffits |
Left alone, ice dam water damage can lead to wet insulation, mold, rotted fascia and soffits and repeat leaks every winter. Large icicles on gutters are also a falling-ice hazard over doors, walkways and driveways.
The best approach to preventing ice dams on the roof works in two directions: keep heat out of the attic, and protect the roof edge when Utah weather wins anyway.
Pro tip: Steps 1–3 treat the cause; steps 4–6 protect the roof edge. On complex rooflines, north-facing eaves and valleys, a roof de-icing system is often the only reliable fix.
Ice dam prevention is a whole-roof job. PRQ Exteriors combines roof-edge protection, ventilation and waterproofing so each piece backs up the next. Here is how we help Utah homeowners and property owners stop ice dams.
Traditional roof heat cable is zigzagged across shingles and clipped in place, where sun and ice wear it out. Thermaline takes a different approach. A UL-listed self-regulating heat cable sits inside a protective copper, aluminum or steel panel that runs along the roof edge and keeps snowmelt moving into the gutter.
According to Thermaline, the system offers:
As a certified Thermaline installer, PRQ designs each layout around your eaves, valleys and gutters, then handles the full Thermaline installation from panels to power.
Valleys and gutters are where ice dams start on most Utah homes. We pair ThermaShingle on the eaves with ThermaValley in the valleys and ThermaGutter for gutter heat cable protection. Metal roofs get ThermaDrip or ThermaSeam for a warm, low-profile drip edge.
Every PRQ roof replacement in snow country includes ice and water shield at the eaves and valleys. Planning a reroof? It is the best time to add ThermaShingle+ or ThermaValley+, which adhere directly to the membrane.
We check soffit, ridge and gable vents during every inspection and correct roof-side ventilation so the deck stays close to outdoor temperature.
Commercial roof ice dams look different. On flat and low-slope roofs, flat roof ice buildup collects around drains, scuppers and parapets. When a roof drain freezes, water ponds, adds weight and finds seams. PRQ's commercial roof de-icing uses ThermaFlat panels, heated drains and downspout cable to keep water moving for property managers, HOAs and building owners.
Short answer: The safest ice dam removal method is professional ice dam steaming, which melts through the ice with low-pressure steam without damaging shingles or gutters. For a temporary fix, a calcium chloride ice melt sock can open a drainage channel.
|
Method |
Safe for your roof? |
Notes |
|---|---|---|
|
Ice dam steaming |
Yes |
The professional standard for ice dam removal in Salt Lake City |
|
Calcium chloride ice melt in a sock |
Yes, short term |
Lay it across the dam to melt a channel to the gutter |
|
Roof rake for snow, from the ground |
Yes |
Removes the snow that feeds the dam |
|
Rock salt |
No |
Corrodes gutters and flashing, stains siding, kills plants below |
|
Hammers, axes or shovels |
No |
Cracks shingles, punctures underlayment, tears gutters |
|
Pressure washers or open flames |
No |
Strips granules, forces water under shingles, fire risk |
|
Climbing an icy roof |
No |
Ice, snow and pitch make falls likely; leave it to a pro |
To remove ice dams safely, stay on the ground and call a pro. Then fix the cause so the same dam does not come back next storm.
What does an ice dam inspection include? A PRQ inspector checks your roof edges, valleys, gutters, ventilation and attic for the conditions that create ice dams. The inspection is free and carries no obligation.
The best time to schedule is late summer or fall, before the first Wasatch Front storm. If you already have an active ice dam leak, call us right away.
Does homeowners insurance cover ice dams? Many policies cover sudden interior water damage from an ice dam roof leak, such as stained ceilings or soaked drywall. Most do not pay for ice dam removal itself, and carriers may deny claims they tie to poor maintenance or long-term neglect. Coverage varies by policy, so call your insurer before you assume either way.
If ice dam water damage shows up, document it right away. Keep a simple file with dated photos of the ice and the interior damage, receipts for removal and repairs and any inspection reports. PRQ's insurance experts can walk you through the claim process and document roof damage with a full photo report.
Yes. Ice dams trap water where shingles are designed to shed it. Over time they cause leaks, rotted decking, wet insulation and gutter damage.
Yes. Water pooled behind an ice dam backs up under shingles and leaks into the attic, walls and ceilings. Ice and water shield limits the damage, but it does not stop the dam.
Late summer or fall, before the first snow. The roof is dry and safe to work on. If you are replacing your roof, install heated panels during the reroof.
Cost depends on the linear feet of eaves, valleys and gutters, your roof type and whether you need a new electrical circuit. Basic heat tape costs less up front, while a heated panel system lasts longer and uses less energy. PRQ provides a free estimate with an exact price for your home.
Yes, when they are designed and installed correctly. Heat cable keeps a melt channel open so water drains instead of refreezing. Panel systems like Thermaline spread heat more evenly and protect the cable from wear.
For most Utah roofs, yes. Thermaline reports up to 65% energy savings versus heat tape, and its panels protect the cable so maintenance drops to about once every 10 years. It also looks cleaner than zigzag cable.
We do not recommend it. Using a roof rake from the ground is fine, but climbing an icy roof or chipping ice is dangerous and damages shingles. Professional ice dam steaming is safer.
Yes. PRQ Exteriors provides ice dam removal and ice dam prevention in Salt Lake City, Sandy, Draper, West Jordan, Park City, Holladay, Cottonwood Heights and across the Salt Lake Valley.
Ice dams are predictable, which means they are preventable. Seal and insulate the attic, ventilate the roof deck, back up the eaves with ice and water shield and add a heated roof edge where Utah snow hits hardest.
Schedule your free, no-obligation ice dam inspection today. Request your free roof inspection online or get a quote for certified Thermaline installation. Not ready to book? Get a satellite-measured instant quote first.
This article is for general education. Roof conditions, insurance coverage and product performance vary. Stay off icy roofs and call a professional for ice dam removal.