Greenpoint heats house by house. The two- and three-family wood-frame and brick homes that fill the side streets between Manhattan Avenue and the waterfront almost all run a single boiler in the basement, venting through a masonry chimney that predates the boiler by decades. When one of those boilers starts acting up — shutting off on cold nights, sooting the burner, filling the basement with an exhaust smell nobody can place — the chimney is where the answer usually is. Sweeps Chimney Services inspects boiler chimneys across Greenpoint with 25 years of experience: a camera run from the boiler room to the roof checking seven points — flue blockage, soot buildup, liner condition, masonry deterioration, backdrafting and spillage, flue sizing, and carbon monoxide safety. Call (347) 297-9646 or message us on WhatsApp — we answer 24/7, calmly and without pressure.
The neighborhood’s housing pattern shapes its chimney problems. Owner-occupied small buildings mean the person paying for heat is usually the person living with the boiler — so venting problems get noticed as fuel bills and comfort, not as abstract maintenance items. The wood-frame houses have freestanding masonry stacks exposed on all sides, and Greenpoint sits close to the water: wind-driven rain, freeze-thaw cycles, and waterfront damp work on mortar joints and brick faces year-round. Water entering the flue is the accelerant — it crumbles mortar, cracks clay tiles, and washes debris down onto ledges where the flue narrows, slowly choking draft.
Oil-to-gas conversions are the deep background problem here, as in most of Brooklyn. Many of these homes ran oil heat for decades before converting, and the conversion changed the exhaust chemistry while the chimney stayed the same. Cooler gas exhaust condenses inside a flue sized for an old oil burner; the condensate attacks mortar and terra cotta liner from the inside. The damage is invisible from the boiler room and painless for years — until the liner tiles start shifting, draft weakens, and the boiler begins the cycle of sooting, shutdowns, and service calls that never quite fix it.
A Greenpoint boiler chimney inspection covers the full run: (1) blockage — the camera finds debris, collapsed liner pieces, and soot-packed sections from boiler room to roof; (2) soot and creosote on the flue walls; (3) cracked, missing or displaced liner tiles; (4) masonry deterioration — spalled brick, open joints, and crown damage from the weather exposure these freestanding stacks take; (5) backdrafting and spillage at the draft hood, watched while the boiler fires; (6) flue sizing checked against the connected boiler, because an oversized flue is the engine of condensation damage; (7) CO safety around the boiler and venting. You get photos from inside the flue and a written report in plain language: what is safe, what needs watching, and what should be fixed before the next cold stretch.
For a two- or three-family homeowner, the report also settles responsibility questions fast. When a tenant reports an odor or the boiler room CO detector chirps, a camera report showing a clear flue — or documenting a cracked liner and spillage — turns a worry into a work order. Heating contractors get exactly what they need: flue dimensions, liner condition, and draft findings, with photos.
Carbon monoxide safety: If your CO alarm sounds, or anyone in the house feels dizzy, nauseous or headachy near the boiler — get everyone out of the building, call 911, and do not go back inside until emergency responders clear the building.
Before installing a new boiler in Greenpoint
Inspect the chimney before the new boiler goes in. The camera shows the installer the flue’s true interior size and the real state of the liner, so the new unit gets venting matched to it from day one — and so the warranty is not voided by a venting defect that was already in the chimney. In these small buildings, one correctly sized liner usually solves the whole venting picture for decades.
Pricing
Boiler chimney inspections follow Level 2 pricing: starts at $199 in Brooklyn. If the flue needs relining, stainless-steel liner installation starts at $3,000 including labor and materials.
Frequently Asked Questions
My house is only two families — does a small boiler really need a chimney inspection?
Yes. Small boilers produce the same exhaust problems at the same physics — blockage, condensation, liner damage — and a two-family home has less margin for error: one bad flue affects every unit and the owner’s own apartment. Annual inspection is the NFPA 211 recommendation for any chimney in service.
The boiler room smells like exhaust sometimes. Is that a chimney problem?
Very often, yes. An exhaust smell in the boiler room is the classic sign of spillage at the draft hood — combustion gases curling back into the room instead of rising up the flue. Causes include blockage, weak draft, or a damaged liner. It is also a CO warning sign, so it should be checked promptly, not lived with.
Can water getting into the chimney really damage a boiler flue?
Yes, and in Greenpoint’s waterfront weather it is a leading cause. Water crumbles mortar, cracks clay liner tiles through freeze-thaw, and washes debris down the flue where it collects and narrows the passage. A failed crown or open joints at the top of the stack are usually where it starts — the camera shows how far the damage has traveled down.
How do I know if my flue is too big for my boiler?
You usually cannot tell from the basement — it takes a camera and a measurement. The symptoms are indirect: persistent condensation, liner tiles deteriorating faster than their age suggests, weak draft, and soot despite a recently serviced boiler. During the inspection we measure the flue interior and compare it against what the connected boiler needs.
What happens to my heat during the inspection?
The boiler is off only for the camera scan — typically a short stretch — then restarted and observed while firing for the draft check. The appointment does not leave the house without heat, and we schedule around your tenants’ needs.
Call (347) 297-9646 or message us on WhatsApp — we answer 24/7, calmly and without pressure. Heating season is here — slots fill fast, book before the rush.
Sweeps Chimney Services INC, 68 Jay Street, Brooklyn, NY 11201, (347) 297-9646.
Related: Greenpoint chimney services | Boiler Chimney Inspection | Boiler Chimney Inspection Williamsburg | Boiler Chimney Inspection Bushwick