Ice at the eaves and water behind the walls in winter
Ice Dam Damage on Rahway Roofs
A ridge of ice at the eave, icicles over the door or a stain on an outside wall after a thaw: ice dam damage in Rahway, NJ comes from heat leaking into the roof. Call (732) 487-3991 and a local roofer can plan a look at the roof edge and the attic.
Safety first, before the roof
- Icicles or a shelf of ice hang above a doorway or path: keep people and pets clear and use another entrance, since large pieces can drop.
- A wire is down, or an ice-loaded limb sits on one: stay far back and treat the wire as live. Reports to PSE&G go through 1-800-436-7734, and anyone hurt needs 911.
- The ceiling sags with trapped water or a light fixture is wet: stay out of the room. Leave the house and call 911 at the first sign the ceiling is giving way.
- The roof is icy and the plan is to chip at the dam: stay on the ground. Chipping from a ladder risks a fall and tears shingles.
Ice problems that overlap with other jobs
Water that gets through at the eave and stains a ceiling lands on roof leak repair. Gutters pulled loose by ice are covered in gutter and downspout repair. A roof that has taken several winters may call for a roof inspection.
Shingle repair or a heat-loss project
Replacing lifted shingles and soaked underlayment at the eave is a repair, but it does not stop the next dam.
The lasting answer lies in the attic: air sealing, insulation and venting. A roofer may suggest the roof work first and the attic work with an insulation contractor, so ask who does which part.
Why January at Newark sets the scene
Newark's January normals from 1991 to 2020 are a high of 40 degrees and a low of 25.5, with 9.1 inches of snow. Days that climb above freezing after a snowfall melt the roof snow, and nights below freezing turn that water to ice. The February 2026 blizzard dropped 27.2 inches at Newark Airport, which is the kind of load that tests an attic's insulation.
Questions people bring to this job
How urgent is an ice dam on the ten-step scale?
Steps 8 to 10: a ceiling that sags, a wet light fixture, a wire down or ice about to drop on a doorway. Move clear and phone 911 or PSE&G where wires are involved, then call (732) 487-3991. Steps 4 to 7: water coming inside, so call this week. Steps 1 to 3: icicles with a dry ceiling. Photograph the dam and note the date.
What makes an ice dam form?
The UMass Amherst article names three ingredients: snow on the roof, heat that melts the underside of it, and cold at the overhang that freezes the meltwater again. Heat escaping from the living space warms the upper roof, while the overhang stays near outdoor temperature, so water freezes at the edge and backs up under the shingles.
How much snow does it take?
On a poorly insulated, poorly air-sealed roof the same article says even one or two inches of snow is enough. Snow also acts as insulation, at roughly R-0.5 to R-1 per inch, which traps more heat below. Newark's normal January snow is 9.1 inches.
What cures an ice dam for good?
The Building America guide begins with air sealing the ceiling plane, then adds insulation and venting, keeping a 2-inch air space between the insulation and the roof sheathing. UMass calls self-adhering underlayment a band-aid, not a cure. A roofer can look at the attic side before suggesting a repair.
Is an ice barrier required on Rahway roofs?
The state's Bulletin 07-3 applies the ice dam membrane requirement only where January averages 25 degrees or colder, and it names Sussex County as that area. Newark averages 32.8 degrees in January, so Rahway sits outside the mandatory area, though ice can still form.
Is ice dam work offered in Linden, Roselle, Carteret and Iselin?
Yes. Ice dam calls come from Linden roofing, Roselle roofing, Carteret roofing and Iselin roofing as well as Rahway. Call (732) 487-3991 with the address and where the water shows.
What changes an ice dam job
- How far the water traveled inside the walls and ceiling.
- Whether the underlayment at the eave is soaked.
- The insulation depth and the air leaks in the attic floor.
- The vents at the soffit and ridge, and whether insulation blocks them.
- Whether gutters and fascia need repair too.
- Ask who handles the attic work and how it is priced, apart from the roof.
Winter moves that make ice damage worse
- Chipping the dam with a hammer or ice pick.The UMass article says more damage is done to life, limb and roof, so leave it for a roofer.
- Installing heat tape as a cure.The same article advises against it, noting it can embrittle shingles and create a fire risk.
- Skipping the attic.Heat loss is the cause, so check for open hatches, recessed lights and gaps around pipes.
Clues on the roof and indoors
- A heavy band of ice built up along the eave
- Long icicles hanging over a door, a walkway or a gutter
- Water stains on a ceiling or wall along an outside wall after a thaw
- Damp insulation, or frost coating the roof boards from below in the attic
- Shingles lifted at the eave or gutters pulled loose by ice
Code and contract notes for ice work
The state's ice dam membrane rule is tied to a cold-county average, so a Rahway job leaves the choice to the owner and the roofer. Contract basics and each town's building office are on the hiring checks page.
Ready when you are
Have the street address ready, along with what is visible from the ground and roughly how old the roof is. Renters: the landlord makes the roof decisions, so tell the landlord.