Do Ice Dams Happen in the Treasure Valley?
Yes, ice dams do happen in the Treasure Valley, just less often than in colder markets. They show up in Boise, Eagle, Star, and the north facing parts of Meridian after a snowfall followed by a week of freezing nights, and they almost always trace back to attic heat loss rather than a bad roof. Dodd Roofing and Exteriors repairs a handful of ice dam leaks every January, and most of the homeowners had no idea their roof could form one.
What causes an ice dam on a Boise roof?
Heat escaping from the living space warms the roof deck, melts the snow on the upper roof, and the meltwater refreezes at the cold eave. A few days of that and a ridge of ice builds along the gutter line. Water pools behind it, works under the shingles, and shows up as a ceiling stain near an exterior wall. Ice and water shield under the first few feet of shingles is the last line of defense, and many Treasure Valley homes built before the mid 2000s do not have it.
Which Treasure Valley homes are most at risk?
Homes in the Boise foothills and the North End, river lots in Eagle and Star, and any north facing slope that holds snow for a week or more. Complex rooflines with valleys and dormers trap more snow. Cathedral ceilings, recessed can lights, and bathroom fans that dump into the attic all leak heat upward, and newer homes are not immune.
How can you tell an ice dam leak from a regular roof leak?
Timing and location. An ice dam leak appears during a thaw after snow, right above an exterior wall, and stops when the ice is gone. A leak from worn shingles or failed flashing shows up in any hard rain, often mid roof near a chimney or vent pipe. Our guide on finding a roof leak source walks through the attic check.
How do you prevent ice dams in the Treasure Valley?
Start in the attic, not on the roof. Air seal the hatch, can lights, and plumbing chases, then bring insulation up to current depth. Balance intake and exhaust so the deck stays cold, which our post on attic ventilation requirements in Idaho explains. Keep gutters clear before the first snow. If your roof is due for replacement, ask for ice and water shield at all eaves and valleys, and treat heat cables as a last resort.
What should you do if you have an ice dam right now?
Do not chip at it with a hammer or shovel, which cracks shingles and voids warranties. Rake snow off the lower three to four feet of roof from the ground, and call for a roof repair visit before the next thaw. Interior water damage is often covered by insurance, but ice removal and the attic fix are not. Dodd Roofing and Exteriors serves the Treasure Valley from Boise to Caldwell. Call (208) 295-9421 for a free inspection.
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