Why Portland Roofs Dam Up: Altitude Sun on a Deep Pack
Altitude makes the sun stronger and the air colder at the same time. A roof in Portland can be producing meltwater on its south face at midday while the thermometer reads well below freezing.
That is why mountain roofs dam up on clear, cold weeks that look harmless. South and west faces melt, north-facing eaves and shaded valleys hold the ice, and the pack above keeps feeding it.
Ice-barrier practice in Multnomah County
Design snow loads up here are among the highest in the country, and the membrane and retention details that come with them are not paperwork. On an older Portland cabin neither is likely to be present.
What a Crew Does on a Portland Roof
The first pass is assessment: eaves, valleys, gutter line and any interior staining, all photographed with timestamps. You see what the crew sees, and the rate and likely hours are agreed before work begins.
Steam then takes the dam off in sections, prioritizing wherever water is actively backing up behind it. The gutter trough and downspout are cleared through to daylight on the same visit, because a clear eave over a frozen gutter is a temporary fix.
How long a removal actually takes
A single-story eave with a thin dam and clear gutters is often an hour or two. A two-story Portland house with ice standing a foot deep across the front, frozen downspouts and a valley packed solid is most of a day for a two-man crew. The honest answer on the phone is a range and the reason for it, not a number designed to win the booking.
The estimate is revised out loud if the roof turns out worse than it looked from the ground, before the extra hours are worked rather than after they appear on the invoice.
Working at night and during an active storm
Freeze events do not keep office hours, and the worst leaks tend to announce themselves in the evening when the day's melt refreezes. Crews run lit, and a roof that is actively collecting snow is worked anyway, because waiting for better weather means the dam is bigger when somebody finally gets to it.
What does stop a crew is wind and lightning. Both are judgment calls made on site in Portland, and a postponed start gets explained rather than dressed up.
What steam actually does
A steam unit delivers water at roughly 290°F at a pressure low enough to rest your hand in the plume. It cuts a channel straight through the ice and lifts the dam off in sections, right down to the shingle. The heat does the work, not force, so granules, seal strips and flashing come through untouched.
That is the whole difference between steam and the hot pressure washers often sold as steam. A pressure washer cuts ice fast because of its pressure — and that same pressure strips the granules off asphalt shingles and drives water up under the courses. One method removes ice. The other removes ice and roof.
| Removal method | Low-pressure steam only. No chipping, salt or pressure washing. |
|---|---|
| Pricing model | Billed by the crew hour, rate quoted before dispatch |
| Service | Ice dam removal in Portland, OR |
| Documentation | Dated before and after photos, written scope in Xactimate line items |
| Typical scope | Steam, 8-16 crew hours typical |
| Coverage area | Portland and Multnomah County |
| Primary climate stressor | Solar melt on deep pack, shaded eaves |
Multnomah County Coverage From Portland
Crews working Portland cover the adjoining communities on the same route — Marylhurst, Happy Valley, Gladstone, West Linn and Tualatin — so a storm week usually means one truck handling several addresses in Multnomah County rather than separate trips.
Nearest hub towns with their own crew pages: Beaverton, Tigard, Lake Oswego, Oregon City, Hillsboro, Gresham.
During a cold snap Portland gets worked alongside the neighboring Multnomah County towns on the same route, with active interior leaks moved to the front of the list.
If water is already inside a property in Portland, call (888) 561-9664 rather than filling in a form — the phone is faster and leaks jump the line.
