Why Is My Skylight Leaking in Pittsburgh? 7 Key Causes

Quick answer

A wet skylight is stressful. First, find where water enters. Place a bucket under the drip. Stop more damage safely from inside. Never climb on the roof. Stay out of the attic in storms. Water often starts high up the roof slope. A roofer must trace the path. Then they can fix the true leak source. Call Slate Authority Pittsburgh for roof help.

Signs to look for

Skylight leaks show up in many ways. You might see water right away. Other times, the signs hide for weeks. Look closely at the ceiling. Check the drywall around the window frame. Drywall is the plaster board on your walls.

Look for these common signs inside:

• Water drips from the frame.
• Wet spots on the drywall.
• Peeling paint near the glass.
• Stains with brown rings.
• Fog between two glass panes.
• Musty smells in the room.

Water can drip straight down. It can also run along wood rafters. Rafters are the sloped wood roof beams. Water follows wood far from the hole. That means the roof hole sits elsewhere. Do not guess where it starts.

Check the glass on dry days. Does the glass look cloudy? Fog means the inner seal failed. A broken seal lets moist air enter. That air turns into water drops.

You may see damp drywall corners. The corners swell when wet. Flaking paint is another early sign. Catching small signs early prevents rotted wood. You can check our signs a slate roof needs repair guide. It will help you spot roof problems fast.

Look at the wood frame too. Does the wood feel soft? Does the paint bubble up? Soft wood means water was there before. Dark spots also point to old leaks. Take notes of what you see. These clues help your roofer a lot.

Common causes

Why do skylights leak? Here are 7 causes roofers find most often.

1. Worn out roof flashing

Flashing means thin metal pieces that seal joints. Roofers wrap flashing around the skylight frame. Rain hits the roof and flows past. Over time, the metal bends, rusts, or lifts. Bad flashing lets rain slip right underneath.

2. Bad roof underlayment

Underlayment is a water shield under your roof cover. It rests right on the wood roof decking. Decking means the flat wood boards of the roof. If the shield tears, water seeps through. Rain will soak the wood underneath.

3. Dried and cracked sealant

Workers use special roof caulk around frames. Sun heat dries this caulk over the years. Winter cold makes it crack and pull away. Once caulk splits, water slips inside. Caulk alone cannot replace good metal flashing.

4. Condensation from indoor humidity

Not every wet spot is a roof leak. Warm air inside your home holds water. This warm air rises to the skylight. Cold outdoor air chills the skylight glass. Water drops form on the pane and drip.

5. Melting ice dams

Winter brings heavy snow and freezing cold. Snow melts on warm roofs and runs down. It freezes again near the cold roof edge. This ridge of ice blocks draining water. Trapped water backs up under the skylight frame.

6. Slipped or broken roof slates

A leak near a skylight may start higher. A broken slate above lets water in. Water travels under the slate to the window. You can check our problem finder to learn more. The skylight might be completely fine on its own.

7. Clogged weep holes

Skylights have tiny weep holes in the frame. These small holes let trapped water drain out. Dirt, pine needles, and moss clog them. When clogged, water stays trapped inside the frame. It then overflows onto your drywall ceiling.

Each of these causes needs care. A roofer must look at the whole roof. Small defects lead to bigger leaks over time. Fixing the true cause keeps your home dry.

What to do right now

You just saw a leak. Do not panic. Take safe steps to protect your home.

Grab a plastic bucket or wide bowl. Place it on the floor under the drip. Put an old towel in the bucket bottom. The towel stops loud dripping sounds. It also stops water from splashing out onto floors.

Move your furniture away from the wet area. Roll up any rugs on the floor. Cover heavy furniture with plastic sheets or tarps. Water damages wood tables and chairs fast. It can also ruin soft couches and floors.

Check the ceiling drywall carefully. Is the ceiling sagging or bulging with water? Stay far away from a sagging wet ceiling. Wet drywall is very heavy. It can drop without warning. Never stand under a wet ceiling bulge.

Never poke holes in a ceiling to drain water. Poking it can cause the whole sheet to tear. The heavy drywall could fall on you. Let water drip on its own into buckets.

Never climb on the roof during rain. Wet roofs are slick and very dangerous. Falls can cause severe injury. Never go in the attic during a storm. Wait until the rain stops completely. Let a trained roofer handle roof work.

Take clear photos from the floor. Snap photos of the drip and stains. These photos show your roofer where water entered. They also help your records later. Write down what time the drip started. Note how hard it rained outside too.

When it is an emergency

Some leaks can wait for morning. Other leaks need fast help. You should know the difference.

Call for fast help if water runs near wires. Water touching light fixtures creates big fire risks. Water in walls can reach switch boxes. If water hits an electrical box, turn power off. Use the main breaker on your wall panel. Never touch wet switches with bare hands.

A ceiling that bows deep down is an emergency. The weight of trapped water can break joists. Joists are the wood boards holding the ceiling. Clear everyone and pets out of that room. Close the room door to keep children safe.

A sudden rushing stream of water is urgent. A small drip can wait in a bucket. A fast stream means flashing blew off. When wind peels metal away, call for help. Pros offer emergency slate roof stabilization to protect the home. Roofers can install a tarp until storms pass.

Listen for odd cracking sounds in the ceiling. Cracking wood means weight is stressing the frame. That calls for quick action. Move your family away from that room right away.

What a roofing pro checks

A roofer will visit to inspect your skylight. They do not just glance at the glass. They check the whole roof area around it.

Here is what the roofer checks:

• Metal step flashing along the sides.
• Head flashing across the top edge.
• Rubber seals around the frame curb.
• Slates or shingles above the window.
• Wood frame for soft rot spots.
• Drain channels for dirt and moss.

Good roofers check the upper roof slope first. Water flows downhill with gravity. A leak four feet above shows at the frame. Our team does full slate roof inspections to find leaks. We track water paths back to the start.

The pro will look at the flashing metal. We often install copper flashing on slate roofs. Copper lasts for decades and solders tight. The roofer checks if old metal rusted through. They make sure the curb stands high enough.

The pro also looks inside your attic space. They inspect the rafters and the roof decking boards. They check for dark mold or soft wood spots. Finding hidden rot early keeps your roof deck solid and safe.

They also check the skylight glass itself. They inspect the rubber gasket along the glass edge. Gaskets keep wind-driven rain out. If gaskets shrink, water leaks inside. The roofer tests the seals to be sure.

Repair or replace

Homeowners often ask if they need a new skylight. Roof age alone never decides roof replacement. Many times, a careful repair fixes the leak. Other times, installing a new unit makes more sense.

Use this simple guide to see your options:

Situation	Best Choice	Why It Works
Rusted or bent flashing metal	Repair flashing	The skylight unit itself is still sound.
Clogged weep holes on frame	Clean weep holes	Clearing holes lets trapped water drain out.
Cracked glass or broken pane	Replace skylight	Broken glass cannot be safely fixed.
Fog trapped between glass panes	Replace unit	The seal failed and heat leaks out.
Rotted wood curb and frame	Replace unit and curb	Rotted wood cannot hold screws tightly.
Loose slate above the curb	Repair slate	Fixing slates stops water entering above.

Read our guide on repair vs replacement to learn more. If the window is sound, you only need leak repair. Our slate roof leak repair service fixes flashings and slates. Good roofers protect what works. They only fix what is broken.

Think about how old the glass is. If the frame is rotten, replace it. If only the metal lifted, repair it. Your roofer will explain what they see. They will help you choose the best path.

What changes the cost

Every home has a different roof shape. The cost to fix a skylight leak varies. Roofers look at several key details to price repairs.

First, the roof pitch matters. Pitch means how steep your roof slopes up. Steep roofs require special ladders and safety ropes. Work takes more time on high, steep roofs. Workers must move carefully to stay safe.

Second, the roof material changes the labor. A slate roof requires great care and skill. Workers must not walk on historic slates. Cracked slates cause new leaks. Slate work requires special tools and extra time.

Third, the amount of wood rot changes things. If water leaked for months, wood decking rots. A roofer must pull up bad wood. They replace it with fresh, sturdy boards. That takes extra labor and materials.

Fourth, the type of skylight matters. Fixed skylights do not open. They have fewer moving parts. Vented skylights open with motors or hand cranks. Vented units have more seals that need care.

Fifth, the flashing metal choice affects cost. Custom copper flashing lasts a very long time. Basic aluminum costs less but wears out sooner. Quality metals save money over the years.

Sixth, roof access affects the job. Tall three-story homes need taller ladders. Tight spaces between homes make staging harder. Easy roof access keeps setup simple and fast.

Local factors

Living in Pittsburgh brings specific weather challenges. Our area gets cold winters with deep snow. It also brings warm, humid summer days. These big swings in weather stress roof windows.

Winter freeze and thaw cycles cause big problems. Snow sits on your skylight glass. Heat from your home melts the bottom snow layer. The water runs down to the cold roof edge. There, it freezes into thick ice.

Ice dams force water backward under metal seams. If flashing lacks tight joints, water pushes in. That is why proper flashing matters so much here. Strong metal joints keep freezing water out of your house.

Our wet springs also bring heavy downpours. Wind drives rain sideways against roof curbs. Roof curbs must sit high enough above the deck. High curbs stop pooling water from creeping inside during storms.

Summer heat also affects seals. Hot sun beats down on black roof tar. Caulk dries out and shrinks in high heat. Then heavy fall rains test those weak spots. Local weather tests every joint on your roof.

Common questions

I am just checking for now. Do I have to fix it today?

It is fine to just gather facts. You do not need to rush into choices. But do not leave leaks unchecked for months. Small drips slowly rot your roof rafters. A quick inspection gives you facts. Then you can plan calmly on your own time.

Is fixing a skylight leak expensive?

It depends on the cause of the leak. Clearing a clogged weep hole is a simple job. Replacing worn flashing takes more labor and metal. Replacing the whole window costs more. Finding the leak early keeps your costs much lower.

Can the repair wait until next season?

Small leaks often seem safe to delay. But hidden water feeds mold behind your drywall. It also rusts metal nails in your roof. Once wood rots, repairs become much larger. It is best to fix leaks before the next rain.

I need to talk this over with my spouse first.

We completely understand. Roof repairs are a shared home choice. A good roofer provides a written estimate with details. You can review the notes together at home. Take the time you need to feel comfortable.

Will my home insurance pay for this?

Insurance covers sudden storm damage in many cases. If a falling tree branch hits the glass, insurance helps. If high wind rips flashing away, they may pay. But insurance rarely covers normal wear or old caulk. Read your policy to know what it covers.

How do I know if it is just condensation?

Look at the weather when moisture appears. Condensation happens on cold, dry winter days. It forms when indoor air is warm and humid. Leaks happen when it rains or when snow melts. If drops show on sunny days, check indoor humidity.

Can I just put roof tar around the frame myself?

Please do not spread black tar on your roof. Roof tar dries out, cracks, and traps water. It also ruins roof slates around the frame. Tar makes future repairs much harder. Proper metal flashing is the only safe way to stop water.

How long does a skylight repair take?

Most simple flashing repairs take one day. Clearing weep holes takes only an hour or two. Replacing bad wood decking may take two days. Your roofer will give you a clear schedule before starting.

Next step

Do you have a leaking skylight in your home? Slate Authority Pittsburgh is here to help. We inspect the frame, flashing, and surrounding slates. We find the true source of your water leak. Then we share clear options to fix it right.