Ice Dam Leaking Through Your Ceiling
Water dripping through your ceiling in winter is almost always an ice dam — and the visible damage is usually 10% of what's actually wet. Wet attic insulation takes 30+ days to dry naturally, which is exactly the timeline mold needs.
Common Signs
- Water staining or active dripping on second-floor or top-floor ceilings
- Icicles forming on eaves (sometimes massive)
- Visible ice dam on roof edge
- Possibly water tracking down inside exterior walls
- Damp insulation visible from attic if accessible
Most Likely Causes
In order of how often we see them on real jobs.
Warm attic air melts snow on the roof
Insufficient attic insulation lets heat escape into the attic. That heat melts roof snow from below.
Melted water refreezes at the cold eave
At the unheated overhang, the water refreezes — forming an ice dam that blocks further drainage.
Water backs up under shingles
Pooled water behind the dam is pushed under shingles by hydrostatic pressure, into the roof decking and ceiling cavity.
Wet insulation saturates
Insulation absorbs the water like a sponge. Loses thermal value permanently above 50% MC. Supports mold growth.
Ice dam water saturates insulation, drywall, framing, and ceiling finishes. Without aggressive drying within days, mold colonizes the attic and ceiling cavity within 1-2 weeks. Repeated ice dam events cause cumulative structural damage to roofs.
How We Fix It
Emergency containment (interior)
Catch drips, protect contents, document with photos for insurance.
Roof rake (from ground, never the roof in winter)
Remove snow from the lowest 4-6 feet of roof to relieve pressure behind the dam.
Open ceiling for drying access
Controlled cuts to expose wet insulation. Remove saturated insulation entirely (it can't dry in place).
Aggressive drying with monitoring
Air movers + dehumidifiers in attic and affected rooms. Daily moisture readings until baseline reached.
Long-term prevention recommendations
Attic insulation upgrade (R-49+), air sealing, soffit/ridge ventilation. The cause must be fixed or the next storm produces the same damage.
Frequently Asked Questions
Should I knock the icicles off?+
Don't climb on a winter roof — fall risk is severe. Knock ice off only from the ground with a long extension. Better: address the snow load on the roof itself with a roof rake.
Will insurance cover ice dam damage?+
Most homeowners policies cover sudden water intrusion from ice dams as sudden and accidental. Roof damage from the ice itself may or may not be.
Is ice dam water dangerous?+
It's IICRC Category 1 (clean) when it enters. Within 48 hours of contact with building materials it degrades to Category 2 (gray). Get drying started fast.
Why does the same spot leak every winter?+
The underlying insulation/ventilation problem is unaddressed. The ice dam reforms at the same eave every cold snap.
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