Why Your Chimney Leaks — And What Actually Fixes It
Water is the single most common thing we are called out for, and it is almost never coming from where the homeowner thinks.
on site
included
If it is urgent
Smoke coming back into the room, a burning smell after a fire, an animal in the flue, or water running down the chimney breast — stop using the fireplace and call us.
Water gets in at four places
A chimney is a masonry column sticking out above the roofline with nothing over it. Everything that goes wrong with it starts there. When we scope a leak, we are checking four things in this order.
- The crown. The slab at the very top. On most New Jersey houses built before about 1950 this is a thin mortar wash rather than a proper cast crown, and mortar wash cracks. Every crack is a funnel pointing straight down inside the chimney.
- The cap. If there is no cap, the flue is an open pipe aimed at the sky. Every inch of rain that falls on your roof falls down it too.
- The flashing. The metal joint where the chimney passes through the roof. Industry inspections find the leak at the flashing or the cap in roughly four out of five leaking chimneys.
- The brick itself. Old brick is porous. Once the face spalls off, the masonry drinks water and holds it.
How to tell which one it is
The location of the stain tells you a lot before anyone goes on the roof.
A stain on the ceiling around the chimney, appearing during or just after rain, usually means flashing. A stain on the chimney breast itself, often several feet below the ceiling, usually means water is running down the inside of the masonry — crown or cap. White chalky deposits on the outside brick (efflorescence) mean water is moving through the masonry and carrying salts out with it, which points at absorption and failed mortar joints.
None of that is a diagnosis. It is a starting point, and it is why we scope rather than guess.
What the repairs involve
Fixing a leak is usually cheaper than people expect if it is caught early, and considerably more expensive if it has been running for years. A cracked crown that gets sealed is a modest job. The same crown left for five winters lets water into the space between the liner and the brick, freeze-thaw takes the masonry apart from the inside, and now you are rebuilding courses.
We photograph what we find and give you a written quote for the specific repair. The $49 inspection is what gets you the photographs.
Common questions
Straight answers
Is my chimney leak actually a roof leak?
Sometimes, and it matters because it changes who should fix it. Flashing sits at the boundary between the two trades. We tell you which one you have rather than quoting you for masonry when the problem is the roof.
Will waterproofing the brick fix it?
Only if absorption through the brick face is genuinely the problem. Sealing a chimney that is leaking through a cracked crown just traps the water inside the masonry, which makes it worse. That is why the diagnosis comes first.
What happens on the visit
- We protect your floor and hearth before anything else
- A camera goes in the flue, bottom to top — not a flashlight
- We check the firebox, damper, smoke shelf and the crown above the roofline
- We confirm which appliances vent into which flue
- You get a written report with photographs the same day
Get it looked at
Inspection $49 · Cleaning $99