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Ice dams and the top of the window

Every window installation assumes water falls downward. In this city, for a few weeks a year, it does not.

Here is the mechanism. Snow on a roof melts from underneath, the water runs down to the cold overhang, and it refreezes there. That ridge of ice grows, and the water behind it has nowhere to go but sideways and backward, under the shingles and into the wall.

Which means water arrives at the top of your window from above and behind it. Almost no window in a mild climate ever has to handle that, and a great many installations are not built for it.

The head of the window is where this is won or lost. That is the top of the unit, and there should be flashing above it that carries water out over the face of the wall rather than letting it run down behind. If that flashing is missing, too short, or lapped the wrong way round, backed-up water goes exactly where you do not want it.

The timing is the diagnosis, and it is free. A leak that shows during heavy rain is a driven-water problem at the face of the wall. A leak that shows in a mid-winter thaw, with no rain at all, is coming from above. Write down when yours appears before you call anybody.

The tells inside are at the top corners. Staining on the casing where the head meets the sides, paint failing along the head trim, and a damp smell in a room whose window looks perfect from outside.

And here is the part that costs people money. Replacing a window that is leaking because of an ice dam replaces a symptom. The new unit will be flashed better, which may help, and the water will still be arriving. The actual fix is a roof, ventilation and insulation conversation, and it belongs to a different trade.

So sequence matters more here than anywhere. Deal with what is happening at the eave first, then do the window. Do it the other way round and there is a fair chance of doing the window twice.

Dormers and anything set into a roof plane are the worst case, because the roof and the wall meet at the window instead of above it. On those, ask specifically how the head is detailed.

Ask each contractor what he thinks is causing the stain before he quotes a replacement. A contractor who looks up at the eave has told you he understands this city.

The longest winter on my list

Bangor has the coldest and longest winter of any town I serve, and that is not a colourful detail on this page. It is the reason the page exists.

More weeks of snow on the roof means more cycles of melting and refreezing, and each one is another chance for water to work backward under an eave. Houses here get tested harder and more often than anywhere else I work.

Broadway's mansions are the difficult case. Lumber-baron Victorians with tall walls, dormers, valleys and complicated rooflines, which is exactly the geometry that concentrates meltwater. Exterior work on some of them may also be reviewed, and what the local district covers is a question for your address, so ask City of Bangor code enforcement before a design is drawn.

The dense older neighbourhoods around downtown put roofs close together and leave snow with nowhere to go but the ground between buildings, which piles it against lower walls and windows.

Postwar development outward is the straightforward half, with simple eaves, generous overhangs and far less trouble at the head.

The working season here is the shortest on my list, so a contractor who says in March that the window can wait until the roof is sorted is being honest rather than difficult.

Construction costs here are the lowest of the larger towns I cover, which means doing the roof and the windows properly in sequence is more affordable than it would be on the coast.

On anything pre-1978, ask about lead-safe work practices.

Who hires a window and door contractor in Bangor, ME

Owners with a stain at the top of a window that only appears in winter. People on Broadway with complicated rooflines and repeated trouble at the same openings. Postwar households doing straightforward replacement.

What does the job cover here?

Removal, repair of whatever the head and the framing above it need, the unit, head flashing carried out over the face of the wall, air sealing, and the trim inside and out.

In this city, add the timing question. When the stain appears decides whether this is a window job at all.

When should you replace windows in Bangor?

Warm weather for the work, because sealants and tapes have working temperature ranges and the opening is exposed while a unit is out. The season here is genuinely shorter than elsewhere in the state.

Winter is when you gather the evidence. Photograph the ice at the eave and the stain inside on the same day, and that pair of pictures is worth more to a contractor than anything you can tell him in June.

Why is Bangor different?

Because the winter here is long enough that water regularly moves upward and backward into buildings, and almost nothing about a standard window installation anticipates that. A replacement quote that has not looked at the roof above the opening is answering a question nobody asked.

A statewide fact worth knowing while you compare quotes: Maine does not license general contractors or builders. Only plumbers and electricians hold state licenses, so nothing certifies that somebody can tell an ice dam leak from a failed unit. Insurance, references, financial stability and reputation are all checkable, and my ten-step process checks all four before I give you a name.

What do Bangor homeowners want to know first?

How do I know if an ice dam is causing my window leak? By when it appears. A stain that shows in a winter thaw with no rain is coming from above. A rain leak shows in rain.

Where does ice dam water get in at a window? At the head, the top of the unit. Water backs up under the roof and arrives from above and behind, which most installations do not anticipate.

Will new windows fix an ice dam leak? Not on their own. Better flashing may help, but the water is still arriving. The fix is a roof, ventilation and insulation job.

What should I do first? Deal with what is happening at the eave, then replace the window. The other order risks paying for the window twice.

Bangor sits at the bottom of these rows more consistently than any town on my list, on labour and land both.

The expensive outcome here is not on the table either. It is buying a window from the first row to solve a problem at the eave, then buying the roof work anyway next year and finding the new unit went in while water was still arriving. Order of operations is the only cost lever on this page, and it is free.