A brown ring on the ceiling by the chimney, a damp smell after a storm, water sitting in the firebox. We find where it gets in and close it off.
Water tracks a long way down brick and framing before it shows on a ceiling. The stain marks where it landed, not where it entered. Finding the real entry point is the whole job, and it is the reason a tube of sealant from the hardware store almost never holds.
Almost every chimney leak in Los Angeles starts at the top or the outside faces of the stack, and the water works its way down from there long before you ever see it inside.
Rain here is not a steady thing. We go eight or nine months bone dry, then a handful of storms arrive close together and dump the whole year at once. That pattern is hard on a chimney.
The dry months do the quiet damage. Sun bakes the crown at the top until fine cracks open across it. Old flashing dries out and lifts at the edges. The face of the brick loses the water resistance it once had. None of that shows while the sky stays clear.
Then the first real storm hits dry masonry, and dry masonry drinks. Brick that has sat parched for most of the year pulls water in through every hairline gap. By the time a ring appears on your ceiling, the leak has been running behind the wall for a while.
So the fix is never guesswork about the flue. We go up top, work out which entry point is letting water in, and repair that. Seal the wrong spot and the water simply finds the next gap.
Tell us what you are seeing when you call. It usually narrows down where on the chimney the water is coming through.
The crown is the sloped slab of concrete at the very top of the stack, around the flue. Its job is to shed rain away from the brick below.
Heat and dry air shrink that slab over the years, and hairline cracks open across it. Rain runs into those cracks and straight down inside the chimney. A crown patch or a rebuild handles it, depending on how far gone the slab is.
Flashing is the metal that seals the joint where the chimney comes through the roofline. It is the most common leak point on any chimney, by a wide margin.
Most of the time someone sealed it years back with roofing tar or caulk. That dries out, shrinks and pulls away from the brick, and the joint opens up. Proper step flashing and a counterflashing cut into the mortar lasts far longer than another bead of caulk.
With no cap on top, the flue is an open pipe aimed straight up at the sky. Rain drops in, and so do leaves, birds and everything else.
You tend to notice this one as water in the firebox and a damper that has rusted stiff. A stainless cap closes the top while still letting smoke out. It is one of the cheaper fixes on this list and it prevents a lot.
Brick and mortar are porous by nature. A little moisture moving through them is normal and dries back out.
Once the brick has aged and lost its surface, though, it soaks up far more than it can shed. After a long dry spell the whole stack acts like a sponge in the first storm, and the damp works through to the inside wall. Waterproofing the masonry is what stops that, and the product matters, which we get into below.
That white bloom on the brick has a name, efflorescence. Salts get carried out of the masonry by water moving through it, and they are left behind on the surface as it dries.
It is a sign water is passing through the joints, and it usually comes with mortar that has gone soft or fallen out in spots. Repointing the open joints closes the path the water is taking.
Not every chimney here is brick. Plenty of homes have a factory-built metal firebox inside a tall framed box, called a chase, finished on the outside with siding or stucco. The lid on top of that box is the chase cover, a sheet of metal that does the same job the crown does on a masonry stack.
Most of the ones we find are galvanized steel, and galvanized rusts. Once it does, the flat spots hold water instead of shedding it, pinholes open along the seams, and rusty streaks run down the siding below. By then the water is getting into the chase and soaking framing you cannot see. We replace it with a stainless cover formed with a slope and an overhanging edge, so the rain runs off and drips clear of the walls.
A brick chimney has to breathe. It takes on a small amount of moisture and gives it back to the air, and it has done that quietly for as long as the house has stood.
Coat it with a hardware-store waterproofer that dries to a hard film, and you close that door. Rain still finds a way in around the top and the flashing, but now it cannot get back out. It sits in the brick through every heat cycle and slowly breaks the masonry apart from the inside. The faces of the brick start popping off.
We use a vapor-permeable waterproofer made for masonry. It keeps rain from soaking in at the surface and still lets water vapor escape from within the wall. On a chimney that has been drinking every winter, that one difference decides whether the repair holds for years or fails by spring.
Left alone, a slow chimney leak also rots roof framing and feeds mold inside the wall. The sooner the entry point is closed, the less of that you pay for later.
Finding the source is most of the work. The repair itself is usually the straightforward part.
Firebox, the ceiling near the chimney, a wall alongside it. Where the water lands, and whether it only comes with heavy rain, both help point us at the source.
Crown, flashing, cap, the mortar joints and the brick faces. We work out which of them is actually letting water through before anyone talks about a repair.
What is letting the water in, what it takes to fix, and the number. No work starts until you have said yes to it.
Crown, flashing, cap or joints, whichever it turned out to be. We fix what is causing the leak, not just the wall it stained.
Where the masonry needs it we seal with a breathable waterproofer, and where we can we run water over the repair to confirm it stays dry inside.
Light rain often runs off before it finds the gap. A hard, driven storm pushes water into cracks in the crown or under lifted flashing that a drizzle never reaches. A leak that shows up only in the big storms usually means the entry point is small and near the top, which is good news for the repair.
Two reasons, usually. Either the sealant went on the stain side rather than the real entry point up top, or it was a film-forming product that trapped water in the brick and pushed it somewhere new. Sealing a chimney only works once you know where the water is actually getting in.
A stain that sits right where the chimney meets the roof points at flashing. Water showing up in the firebox itself points higher, at the crown or a missing cap. We confirm it from the roof rather than guess, since the fix is different for each.
Fine surface cracks can often be sealed with a proper crown coating. Once the slab has deep cracks or chunks breaking away, a patch will not hold and it needs rebuilding. We tell you which one you are looking at after we see it, not before.
If the water is dropping straight down an open flue, a cap solves it. If it is coming through the crown, the flashing or the brick, a cap helps but it will not be the whole answer. Often a cap goes on as part of a repair rather than as the repair.
It depends on the source. A cap or a flashing reseal sits at the lower end. A full crown rebuild or extensive repointing costs more. We find the cause first and give you the number before any work starts, so there are no surprises partway through.
Yes, and it tends to. The same water rusts the damper, breaks down the mortar in the firebox, rots the framing around the chimney and feeds mold inside the wall. A leak caught in one wet season costs a lot less than one left for three.
Tell us where the water shows up inside and we will find where it starts outside. Cause first, price before we start, and a repair aimed at the source.
