Posted January 2026 · Updated May 2026 · About a 9-minute read

How to actually stop ice dams in Oakland County.

Every February, the calls roll in: "There's a wall of ice on my roof and water's coming through the ceiling." If you've lived in Bloomfield Hills, Birmingham, Rochester, or pretty much anywhere in Oakland County for more than a couple winters, you've either had an ice dam or you know someone who has. This is the article we wish more homeowners read before the first cold snap.

What an ice dam actually is.

An ice dam is a ridge of ice that builds up at the eave of your roof — the lowest, coldest edge that overhangs the wall. Once the ridge gets tall enough, snowmelt running down the warmer upper part of the roof hits the ice dam, has nowhere to go, and starts pooling. Then it works backwards under the shingles. Then it drips down through the soffit, into the wall, and onto your dining room ceiling.

That's the part most homeowners understand. What people misunderstand is why ice dams form in the first place.

Ice dams aren't really a roof problem. They're an attic problem.

This is the core thing to get. Ice dams happen because the upper part of your roof is warmer than the eave. Snow melts on the warm part, runs down to the eave (which is at outdoor air temperature), and refreezes. The bigger the temperature differential, the worse the dam.

So why is the upper roof warmer than the eave? Two reasons, both inside the house:

Heat is escaping into the attic. Either because attic insulation is undersized, because warm air is leaking through can lights and bath fans, or because the duct work is uninsulated.
The attic isn't venting properly. Cold outside air should be entering at the soffit and exiting at the ridge, constantly washing the underside of the roof deck with cold air. If the soffits are clogged, painted over, or undersized, the air doesn't move — and the heat builds up.

Fix those two, and the upper roof stays roughly the same temperature as the eave. Snow doesn't melt early. Ice dams don't form. The roof stops being the problem.

What does and doesn't work to stop ice dams.

Doesn't really work:

Heat cables. They melt a channel through the dam. They don't stop the dam from forming. Every year they get more expensive to run. They're a band-aid, not a fix.
Salt or calcium chloride socks. Same problem — they melt a path through the ice. They also corrode flashing and stain shingles.
Roof rakes. They help in an emergency to relieve pressure on the dam, but they don't stop the underlying cause. And if you're standing on a ladder in February raking snow off a 12/12 pitch, you're one slip from a hospital trip.
"Ice melt" products applied to the dam. See above.

Actually works:

Air-seal the attic floor. Find every penetration where warm air leaks into the attic — can lights, attic hatch, plumbing chases, the seam between the top plate and drywall — and seal them. This is the #1 fix and the one most homeowners skip.
Add insulation to R-49 or better. Michigan code is R-49 (about 14" of blown-in cellulose or fiberglass) for attic insulation. A lot of older Oakland County homes are still running R-19 or R-30. Bumping it up isn't expensive and the heating bill savings often pay for it in a few winters.
Verify continuous soffit intake. Look at your soffits. Are the vents clear? Are they painted shut? Are they undersized for the home? We see all three constantly. If intake is restricted, the ridge vent can't pull air through, and the attic gets hot.
Install ice and water shield at the next reroof. Michigan code requires it 24" past the warm wall. We install it 6 feet up from every eave, in every valley, and around every penetration. It won't stop the dam from forming, but it stops the water that does back up from getting through the deck. This is the most important roof-side defense.

How to tell if it's a roof problem or an attic problem.

Most ice dams are attic problems. But there are a few cases where the roof itself is contributing:

The valley is icing repeatedly. If you're getting ice damming in the same valley every year, the underlayment in that valley is suspect — and a competent reroof will solve it.
The dam is forming above an unheated section. If you have an ice dam over an unheated porch, breezeway, or garage attic — and the heated portion of the roof above is fine — that's a roof-design issue (often a missing thermal break) that we can solve during a reroof.
Skylights are leaking when the dam thaws. The flashing around the skylight is the actual leak path. The dam is the trigger, but the skylight flashing is the fault.

If your home is having ice dam problems and you can't tell whether it's the roof or the attic, we'll come look. Free, no obligation. Usually we can tell within 20 minutes.

What about new construction?

If you're building or doing a major addition in Oakland County, the easiest way to never deal with ice dams is to plan for them in the design phase: continuous soffit intake, ridge venting, R-60+ in the attic, air-tight attic floor, ice and water shield 6+ feet up from the eave, and — if you really want to make sure — standing seam metal on the lower portion of the roof. Metal sheds snow before the dam can build.

Quick action checklist for this winter.

Walk the inside of your attic on a cold day. Can you feel air movement at the soffits? If not, intake is restricted.
Look at the underside of the roof deck. Frost on the deck = warm air leaking up from the house. That's your air-sealing problem.
Check insulation depth. Less than 12 inches? You're under-insulated.
Watch the roof after the first heavy snow. Does the snow stay on for days at uniform depth, or does it melt patchily and refreeze? Patchy melt = attic heat loss.
If you've had ice dams two winters in a row, the next reroof is the time to fix it for good. Ask us about it during the estimate.