The stain is two feet away from the chimney. Is the chimney still the cause?

Often, yes. Water that enters at the crown or flashing runs down inside the structure and along framing before it reaches the ceiling. That is why the entry point is traced rather than guessed at from where the stain appears.

Why does my Hempstead chimney leak only in certain storms?

Wind direction. Hempstead gets nor'easter winds and wind-driven rain off the coast, and that rain is pushed sideways into gaps that ordinary vertical rain runs straight past. A chimney can stay dry for months and then leak hard in one storm.

Do I need a permit for this in Hempstead?

In New York, permits are issued locally by the municipal or county building department, not by a state agency. Routine sweeping and inspection generally do not need one, but structural masonry work such as rebuilding a chimney above the roofline typically does. Call your local building department before work begins.

Is there a state chimney licence I should ask about?

New York does not issue a statewide licence for chimney sweeping, inspection or masonry repair. Nassau County runs its own home improvement contractor licensing program, so verify current requirements with the county consumer affairs or licensing office for work in Hempstead.

How do I know the repair matches the problem?

Ask the technician to show you what they found — camera footage from inside the flue, photos of the crown, cap and flashing. Ask for the reasoning in writing alongside the price.

Water coming in in Hempstead, NY

You have a damp patch on the ceiling next to the chimney. Maybe a stain on the wall, or a smell of wet brick in the firebox. Water is getting into the chimney somewhere above, running down inside it, and coming out where you can see it. The wet spot is almost never directly under the hole. Water travels along mortar joints, down the outside of a flue, and along framing before it shows itself.

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A lot of Hempstead housing predates 1960, and masonry chimneys serving older fireplaces and boilers are widespread here. Those chimneys have had decades of weather. Hempstead sits about five miles inland from the South Shore bays, so salt-laden air and nor'easter winds reach the village and go to work on chimney caps and flashing. Winter brings repeated freeze-thaw cycles, and freeze and thaw widens every crack it finds. Wind-driven rain then gets in where ordinary rain would just run past.

While you wait — please don't

Do not seal over the stain. Painting or patching the ceiling hides the evidence you need to find the actual entry point, and the water keeps coming.
Do not assume it is only cosmetic. A chimney that has been wet for years can become structurally unsound, and falling brick is a hazard at the base.
Do not light a fire to dry it out. Heating a saturated flue does not dry a chimney out, and if water has damaged the liner you may be putting combustion gases somewhere they do not belong.
Stop using the fireplace if smoke enters the room. Smoke coming back inside can mean a blockage or a damaged liner, so stop using it until it has been inspected; if anyone feels dizzy, sick or confused, get outside and call 911.
Do not go up on the roof yourself. Wet masonry and a steep roof are a bad combination, and from the ground you cannot see the crown, cap or flashing anyway.

What the technician does

The entry point gets tracedThe technician works out where the water is actually getting in rather than sealing over the stain. That usually means looking at the crown, the cap, the flashing, the brick face and the mortar joints, plus the inside of the flue.
Flashing replaced and counter-flashedWhere the chimney meets the roof is the most common way in. New flashing is counter-flashed into the mortar joint so water runs out rather than behind it.
Crown repaired or recastThe crown is the slab on top of the chimney. Cracks let water straight into the masonry, so it is repaired or recast depending on what is left of it.
Cap fittedA cap keeps rain out of the open flue. It also keeps animals and debris out, which matters on a coastal Long Island roof after storms and downed limbs.
Repointing and spalled brick replacedOpen mortar joints and brick faces that have flaked off from freeze-thaw are repaired. Damaged brick that has broken down is cut out and replaced.
Breathable water repellent where appropriateOn some chimneys a breathable repellent is applied so the masonry sheds water but can still dry out. It is used where it suits the chimney, not on every job.

Why this happens in in Hempstead, NY

Hempstead's weather does two things to a chimney. In winter, water soaks into brick and mortar, freezes, expands and opens the crack a little wider. That repeats all season. In warmer months, humid summers and year-round moisture keep an unused flue damp, which is often where the smoky or musty damp smell in the living room comes from. Add tropical storms and hurricanes — Irene in 2011, Sandy in 2012 — plus nor'easters and winter wind-driven rain, and a small gap in a crown or a lifted piece of flashing becomes a leak.

Timing matters here too. Across Hempstead and the rest of Nassau County, calls spike in early spring once winter freeze-thaw damage shows itself, and again in late summer and fall when people are prepping for hurricane season and heating-system startup. Many older homes here still vent oil or gas boilers into unlined masonry chimneys, so a leaking chimney is not just a fireplace problem — it can be sitting on top of an active venting flue. Masonry rebuilding and repointing in New York concentrate in the warmer months, because mortar needs to cure without freezing. If you are seeing a stain now, it is worth getting it looked at rather than waiting for the next storm.

Questions people ask

The stain is two feet away from the chimney. Is the chimney still the cause?: Often, yes. Water that enters at the crown or flashing runs down inside the structure and along framing before it reaches the ceiling. That is why the entry point is traced rather than guessed at from where the stain appears.
Why does my Hempstead chimney leak only in certain storms?: Wind direction. Hempstead gets nor'easter winds and wind-driven rain off the coast, and that rain is pushed sideways into gaps that ordinary vertical rain runs straight past. A chimney can stay dry for months and then leak hard in one storm.
Do I need a permit for this in Hempstead?: In New York, permits are issued locally by the municipal or county building department, not by a state agency. Routine sweeping and inspection generally do not need one, but structural masonry work such as rebuilding a chimney above the roofline typically does. Call your local building department before work begins.
Is there a state chimney licence I should ask about?: New York does not issue a statewide licence for chimney sweeping, inspection or masonry repair. Nassau County runs its own home improvement contractor licensing program, so verify current requirements with the county consumer affairs or licensing office for work in Hempstead.
How do I know the repair matches the problem?: Ask the technician to show you what they found — camera footage from inside the flue, photos of the crown, cap and flashing. Ask for the reasoning in writing alongside the price.

One call

One call to (866) 576-7943 and we arrange for an independent sweep or mason to come out and look at your chimney in Hempstead. The estimate is free, the technician inspects first and gives you the price, and nothing starts until you approve it.

Call now · (866) 576-7943

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