The short answer
Aging Sealant and Flashing
The sealant used to waterproof the skylight frame and flashing joints hardens with age. This material loses its flexibility and can shrink, pulling away from the surface. Small cracks develop, allowing water to seep in during rain. Flashing, the metal strips that direct water away, can also warp, rust, or separate from the roof deck, breaking its watertight seal. Even high-quality materials degrade after years of exposure to sun, rain, and temperature swings.
Roof Movement and Settling
Your roof is not a static structure. It expands with heat and contracts in cooler temperatures, a cycle that repeats daily. Over many years, this movement can fatigue the materials around a fixed skylight. The constant flexing can open tiny gaps in the seals and loosen the mechanical fasteners that hold the flashing in place. This gradual process is why a skylight that was perfectly fine for a decade can suddenly start leaking.
- Thermal expansion and contraction from sun exposure.
- Normal settling of the house structure over years.
- Wind uplift that loosens fasteners or flashing.
- Vibration from nearby construction or heavy traffic.
Roof Membrane Degradation
The roofing material itself, whether shingles or a flat roof membrane, deteriorates over time. Sunlight, hail, and freeze-thaw cycles break down the material's protective qualities. When the roof surface around the skylight weakens, water can penetrate under the flashing or through compromised shingles. This water then finds its way to the skylight opening from above or behind. On a shingle roof, missing or cracked shingles near the skylight are a common culprit. On a flat roof, blisters or splits in the membrane can channel water toward the fixture.
Clogged Drainage Channels
Many skylights, especially curb-mounted models, have built-in gutters or drainage channels. Their job is to catch any incidental moisture that gets past the primary seal and divert it back to the roof. Over years, these small channels can become clogged with leaves, pine needles, dirt, or even insect nests. When blocked, water backs up and spills into your home. This type of leak can be intermittent, only happening during heavy rain when the channel overflows.
What to Do When It Leaks
Your first step is to protect your home's interior. Contain the water to prevent further damage to ceilings, walls, and floors. The repair requires two separate trades: a qualified roofer must fix the skylight leak at its source. Then, water damage restoration pros are needed to dry out the wet building materials inside to prevent mold and structural issues. Do not delay the drying process, as damp insulation and framing can begin to grow mold within a couple of days.
- Move furniture and belongings away from the drip area.
- Place buckets or towels to catch water.
- Turn off electricity to the room if water nears fixtures.
- Document the damage with photos for insurance.
- Contact a roofer to assess and repair the skylight.
- Call local water damage pros for interior drying.
Talk to someone now
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (405) 565-9833Frequently asked questions
Is a leaking skylight an emergency?
Yes, it requires quick action. A continuous leak can soak insulation, rot wood framing, and ruin drywall. It also creates perfect conditions for mold growth within 24 to 48 hours. You should address the interior water damage promptly.
Who should I call to fix it?
You typically need a roofer to permanently repair the skylight seal, flashing, or surrounding roof. For the water inside your home, you need the pros. They have the equipment to dry walls, ceilings, and subfloors properly.
Will my homeowner's insurance cover this?
It might, if the leak causes sudden, accidental water damage. Damage from long-term wear and tear or lack of maintenance is often excluded. Policies vary, and your insurer decides what is covered. Check your policy and report the claim promptly.