Utah roofs
Ice Dams and Freeze-Thaw on Northern Utah Roofs: What Causes Them and What to Fix Before Winter
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Every winter, Wasatch Front homeowners call about the same things: a brown ring on a ceiling near an outside wall, or a thick ridge of ice hanging off the gutters after a sunny week of snow. Usually that’s an ice dam. A separate problem, freeze-thaw wear, works on aging shingles all season. The NuRoof Guys see both, and they need different fixes.
GoNano’s article on ice dams and freeze-thaw damage frames them the same way: two related problems with two different solutions. Here’s how to tell them apart and what to fix before the snow sticks.
What an ice dam is
University of Minnesota Extension defines an ice dam as “a ridge of ice that forms at the edge of a roof and prevents melting snow (water) from draining off the roof.” Water backed up behind it can leak into the attic, walls, and ceilings.
The cause is uneven roof temperature, not the snow by itself. In Extension’s words, “Nonuniform roof surface temperatures lead to ice dams.” Snow melts over the warm part of the roof, runs down to the colder eaves, and refreezes there.
Most of that heat comes from inside the house. Extension points to warm air leaking into the attic through gaps around ceiling penetrations such as light fixtures, and says that “in many homes this is the major mode of heat transfer that leads to the formation of ice dams.” Its new-construction guidance adds that “recessed lights, skylights, complex roof designs, and heating ducts in the attic will all increase the risk of ice dam formation.”
Why Northern Utah roofs see both problems
Utah’s energy code uses the 2021 International Energy Conservation Code (IECC) climate zones. In that table, Weber, Davis, Salt Lake, Utah, Box Elder, and Cache counties are Zone 5B, and Morgan, Summit, Wasatch, and Rich counties are Zone 6B. Both are cold-climate zones. Snow that sits on a roof gives an ice dam something to work with, and winter days that swing above and below freezing drive freeze-thaw wear.
Freeze-thaw is a shingle problem
Freeze-thaw damage doesn’t need an ice dam. As GoNano’s article describes it, water gets into a small crack, a lifted tab edge, or a spot where granules have worn off. When it freezes, it expands and pries the opening wider. On an older, brittle roof, repeated cycles can turn hairline cracks into broken or missing pieces. Look especially along the lower edge, where meltwater and ice sit longest. Our post on why Northern Utah asphalt roofs age faster covers what makes shingles brittle in the first place.
Warning signs you can check from the ground
You don’t need to get on the roof. From the yard or inside, look for:
- A thick ridge of ice along the eaves or gutters, especially above a heated room. Icicles alone aren’t always a problem, but a heavy band of ice is a signal.
- Ice building up near downspouts. The Insurance Information Institute (Triple-I) tells homeowners to “watch for ice dams near gutter downspouts.”
- Water stains or peeling paint on ceilings or walls near outside walls, often the first inside sign.
- Curled, cracked, or missing shingle pieces along the lower edge once the snow is gone.
If it’s safe, look into the attic from the hatch with a flashlight for frost on nails or the roof deck and damp insulation near the eaves. If you go in, step only on the framing, never on the insulation.
What actually prevents ice dams
The lasting fix happens inside the attic, not on the shingles. When The NuRoof Guys find that, we’ll say so.
- Seal attic air leaks first. Extension’s order is to “make the ceiling air tight so no warm, moist air can flow from the house into the attic space,” and only then add insulation. Common leak points include light fixtures, the attic hatch, and plumbing and duct openings.
- Bring insulation up to a cold-climate level. ENERGY STAR’s retrofit table recommends R60 for an uninsulated attic in Zones 5 and 6, and R49 if you already have 3 to 4 inches of insulation.
- Keep attic ventilation working. Intake vents at the soffits and exhaust vents near the ridge carry heat and moisture out. Extension notes that if the air sealing and insulation work is done well, “only small amounts of roof ventilation are needed to maintain uniform roof surface temperatures.”
Extension says the contractor you hire should “conduct a blower door test to evaluate how airtight your ceiling is.”
If ice is already on your roof
- Stay off the roof. Extension warns that “anyone on the roof during the winter or performing work on the roof from below risks injury and may cause damage to the roof and house.”
- Don’t chip or pick at the ice. Chipping can damage shingles and gutters, and it means working on a ladder or roof in winter. Hire it out.
- Be careful with roof rakes. Extension says a roof rake “can be used to remove snow, but may damage the roofing materials.” If you use one, stay on the ground, keep clear of power lines, and stick to low, single-story eaves. Otherwise, hire it out.
- Protect the inside. Move belongings and catch the water. Extension advises: “Do not repair interior damage until ceilings and walls are dry.”
- Document it for insurance. Whether ice-dam damage is covered depends on your policy and on what caused it, so read yours and ask your agent before you file. Our Utah homeowners insurance roof checklist covers what to photograph and save.
Then fix the cause. Extension puts it plainly: interior repair should be done together with correcting the heat loss, “or the damage will occur again.”
Repair, restore, or replace before winter
An attic fix doesn’t undo shingle wear that’s already there. In a roof inspection, The NuRoof Guys check the eaves, valleys, flashing, and vents for damage that could let water in this winter.
- Repair when you have specific problems: cracked or missing pieces, lifted tabs at the eaves, failed pipe boots, or open flashing.
- Restore with rejuvenation only when the asphalt roof is aging but still sound. Rejuvenation is not right for every roof. It is one step in a maintenance plan. It does not make an old roof new, and it does not fix an attic air-leak problem.
- Replace when the roof is past saving, with widespread brittleness, soft decking, or repeated leaks.
See our Utah roof maintenance checklist and roof sealing vs. rejuvenation for more.
Frequently asked questions
Are icicles on my gutters a problem? Not always. A thick ridge of ice along the eaves, ice near the downspouts, or water stains inside are the signs to act on.
Should I chip the ice off myself? No. Chipping can damage shingles, and winter roof work is dangerous. Hire it out.
Can rejuvenation stop ice dams? No. Ice dams start with heat escaping into the attic, so the fix is air sealing, insulation, and ventilation. Rejuvenation is a separate question about whether your shingles are aging but still sound.
Get your roof checked before the snow sticks
The NuRoof Guys inspect roofs across Northern Utah, including Ogden, Layton, Kaysville, Bountiful, Salt Lake City, and Logan. We’ll tell you plainly whether your roof needs repair, restoration, or replacement, or whether the real fix is in the attic.
Call 385-383-8479, email info@nuroofutah.com, or schedule a free roof inspection.
Sources and further reading
- University of Minnesota Extension, Dealing with and preventing ice dams (reviewed 2022)
- ENERGY STAR, Recommended Home Insulation R-Values
- Utah Energy Code 2021 (IECC 2021), Chapter 3 RE, Table R301.1 climate zones by county
- Insurance Information Institute, Mitigation Reduces Winter Weather Risks for Homes, Vehicles
- GoNano, Ice Dams and Freeze-Thaw Damage on Shingle Roofs