Why Scottsbluff Ceilings Leak During a Mid-Winter Thaw

When a ceiling stains or drips during a winter warm-up, the cause is usually one of three things: an ice dam at the edge of the roof, a regular roof leak that the melting snow has found, or frost in the attic melting all at once. Each one has its own signs. This guide is for homeowners in Scottsbluff, Gering, and Terrytown who want to know what they are looking at and what to do next.

Cause 1: An ice dam at the eave

An ice dam starts with heat. Warm air from the house gets into the attic and warms the roof deck, so snow on the upper roof melts even when it is cold outside. That water runs down to the eave, which hangs out past the warm part of the house and stays cold. There it freezes and builds a ridge of ice.

When the next thaw comes, melt water from higher up runs down, hits that ridge, and pools behind it. Shingles are made to shed running water, not hold back standing water, so the pooled water can work its way up under the shingles and into the house.

Signs it is an ice dam:

• The stain is near an outside wall, often along the edge of a ceiling or at the top of a wall.
• You can see a thick ridge of ice along the eave from the yard, often with heavy icicles.
• The leak shows up during a thaw after snow has been sitting on the roof, and stops when it freezes again.

Cause 2: A roof leak the snowmelt found

Sometimes the thaw just exposes a problem that was already there: a lifted or missing shingle, a cracked rubber boot around a vent pipe, or loose flashing around a chimney or skylight. Melt water runs into the opening the same way rain would.

Signs it is a penetrating leak:

• The stain is under a chimney, vent pipe, skylight, or a valley, not only at the edge of the room.
• It also leaks during rain, not just during snowmelt.
• There is no big ice ridge at the eave above it.

Cause 3: Attic frost melting

On cold nights, moisture from the house can rise into the attic and freeze on the underside of the roof and on nail tips. When a warm day hits, that frost melts all at once and drips onto the insulation and ceiling. Stains from this tend to be scattered, may show small rust-colored spots around nails, and can appear even when the roof looks clear. It usually points to attic airflow or air leaks from the house rather than a roof covering problem.

What you can safely do right now

• Put a bucket or towels under any drip and move furniture, rugs, and electronics out of the way.
• If water is near a light fixture or outlet, turn that circuit off at the breaker and keep clear of it.
• If the ceiling is sagging or bulging, keep people and pets out from under it.
• Take dated photos of the stain and of the roof edge from the ground. They help whoever looks at the roof later.
• From the yard, look for an ice ridge along the eaves and note which part of the house it is on.
• If you can reach the attic hatch safely, a quick look with a flashlight for wet insulation or frost on the boards can help tell the causes apart. Do not walk on ceiling drywall between joists.

What not to do

• Do not climb onto the roof. A roof with snow and ice on it is no place to be.
• Do not chip, hammer, or chop at an ice dam. It is easy to break shingles and gutters doing this, and easier to get hurt.
• Do not use open flames, torches, or heat guns on the roof or eave.
• Do not pull down large icicles from below, especially over doors and walkways.

Pete’s Builders does not do interior water-damage restoration. If drywall or insulation is soaked, a water-damage professional can tell you how to dry it out. Questions about whether a policy covers any of it belong with your insurance agent.

When to call a roofer

Call if the stain keeps growing, if water comes back with every thaw, if you can see an ice ridge forming in the same spot every winter, or if the leak lines up with a chimney, vent, or skylight. A roofer can look at the roof covering, flashing, and roof edge. Scottsbluff inspections include a check of attic ventilation.

You can read more about our roofing work in Scottsbluff or start at the Pete’s Builders Nebraska home page.

Frequently asked questions

Why does my ceiling only leak when the snow melts?

Often it is an ice dam: melt water pools behind ice at the eave and backs up under the shingles. Attic frost melting on a warm day can look similar.

Should I knock the ice dam off my roof?

No. Chipping or hammering ice can break shingles and gutters and is dangerous. Keep clear of the roof and call for an inspection.

Does Pete’s Builders fix the water damage inside?

No. Pete’s Builders does not do interior water-damage restoration. We look at the roof to find where the water is coming from.

How do I tell an ice dam from a regular roof leak?

Ice dam leaks are usually near outside walls and show up during a thaw. A regular leak is often under a chimney, vent, or skylight and also shows up in rain.