Chimney & Skylight Leak Repair in Pittsburgh — Find the Culprit, Fix the Right Thing
You already know where it leaks. The question is why — and around chimneys and skylights, there are half a dozen suspects that all drip in the same spot. We test until we know which one is yours, then fix that.
Chimney and skylight leaks come with a special frustration: everyone blames someone else’s part. The roofer eyeballs it and says it’s the chimney guy’s problem. The chimney sweep says the roof. The skylight manufacturer says it was installed wrong. Meanwhile the stain on your ceiling keeps growing, and you’ve paid two trip charges to learn nothing.
Here’s the truth underneath the finger-pointing: a chimney or skylight is a hole in the roof with a structure sitting in it, and water can get in through the structure, the roof, or the joint between them. The drip looks identical from your living room either way. Pittsburgh Roofing Specialists works both sides of that joint — we test until we know which part is actually failing, fix what’s ours to fix, and tell you plainly if what you need is a mason or a glass unit instead of a roofer.
The Chimney Leak Suspects
Around a chimney, water has five ways in. In the rough order we find them:
The flashing
The metal joint between chimney and roof — the single most common culprit. If that's your failure, it's a metalwork repair, and our flashing repair page covers exactly how we do it.
The crown
The concrete slab on top of the chimney. Crowns crack with age and freeze-thaw, and a cracked crown lets water soak down inside the chimney structure — a leak no amount of roof work will stop.
The brick and mortar
Old brick gets porous, and failing mortar joints wick water like a sponge. The tell: the leak shows up during long soaking rains rather than short storms, because the masonry takes hours to saturate.
The cap — or the missing one
No chimney cap means rain falls straight down the flue. It's the cheapest fix on this list and gets overlooked constantly.
Condensation, not rain at all
Furnace exhaust carries moisture, and in a cold flue it condenses and runs back down. If the “leak” shows up in freezing weather with no rain in sight, this is the prime suspect.
The repair for each of these is completely different — which is why “we resealed around the chimney” so often fixes nothing. Diagnosis first, always.
The Skylight Leak Suspects
Skylights get blamed fast — “of course it leaks, it’s a window in the roof.” Usually it’s one of four things:
The flashing kit
The metal collar sealing the skylight frame into the roof. It fails long before the skylight does, and it's the most common true leak.
Clogged weep channels
Skylights are built to drain small amounts of water through tiny channels. When debris blocks them, water backs up and shows up inside — a cleaning-level fix that gets misdiagnosed as a failed skylight.
Condensation
A cold glass surface plus a humid room (bathrooms especially) equals dripping that looks exactly like a leak — but shows up on cold mornings, not rainy ones.
A failed glass seal
Fog or moisture between the panes means the insulated unit has failed. It's not leaking into your house — but it's done, and it's a unit replacement, not a roof repair.
When it truly is the skylight and the unit is old, we’ll give you the honest three-way comparison: reflash it, replace it, or remove it and roof over the opening. Plenty of Pittsburgh homeowners with a 30-year-old builder skylight over a hallway pick the third option and never miss it.
How We Tell the Suspects Apart
The pattern of the leak is the fingerprint. When it drips — long soaker vs. short storm, rain vs. dry freezing morning — plus what we find on the roof, in the attic, and with a hose test when it’s ambiguous, points to one suspect. You get photos of the evidence and a flat written price for the actual fix.
And the boundary promise, in writing: if the diagnosis is masonry — a crumbling crown, spalling brick — we’ll show you the photos and say “this needs a mason,” not sell you roof work that won’t stop it. Same the other way: if a chimney company told you it’s the roof, we’ll confirm or correct that with evidence.
Chimney & Skylight Leak Repair Cost in Pittsburgh
Most of these repairs run $150–$600 for a chimney, and for skylights range between 300$ to 1500$. A chimney cap or cleared weep channels sits at the low end; skylight reflashing in the middle; a full chimney flashing rebuild or skylight replacement at the top. Roofing over a removed skylight is quoted per the roof type. One flat written price after diagnosis, before any work.
Chimney & Skylight Questions, Answered Straight
That pattern usually points to saturated masonry — porous brick or failing mortar drinking water for hours before it reaches the inside. Short-storm leaks point more toward flashing. The pattern is real evidence; mention it when you call.
No — that’s the classic signature of condensation, either from a cold flue or a cold skylight over a humid room. It needs a different fix than a rain leak, which is exactly why we ask about timing before anyone climbs a ladder.
We repair the flashing and the mortar joint it seats into. Structural masonry — a cracked crown, spalling brick, a rebuild — is honest mason territory, and we’ll tell you so with photos rather than working around a problem that will undo the repair.
Real question, honest answer: if the unit is decades old and the leak is in the flashing, reflashing is usually worth it. If the unit itself has failed, compare replacement cost against roofing over the opening — for a skylight nobody would miss, removal is often the cheaper permanent fix. We’ll price both so you can choose.
Then start one page over — our roof leak repair service is built for exactly that: tracing a leak to its source when the source isn’t obvious.
Stop Paying Trip Charges to Hear “Not My Part”
One assessment covers the roof side, the joint, and an honest read on the structure — photos, a named culprit, and a flat written price for the right fix. Roof Repair Specialist Pittsburgh.