Downdraft repair for fireplaces that push smoke back into the room
Downdraft repair is the work of finding out why air or smoke is coming down a chimney instead of going up it, and then correcting that cause, whether it sits in the flue, at the top of the stack or in the house itself. Working out of our Union Street office, we trace these problems for homes in New Bedford, Dartmouth, Fairhaven and Acushnet before recommending any fix.
Why draft goes wrong on this stretch of coast
A chimney draws because warm gas rises. Wind, nearby buildings and the way a house breathes can all overpower that pull, and each shows up often in these four towns.
Wind off the bay
Steady wind from Buzzards Bay and nor’easter gusts can press down on the top of a flue or swirl around it. A chimney that draws well on a calm night may puff smoke on a blustery one.
Close-packed city lots
The state’s survey of New Bedford describes houses built close together on a tight street grid, with three-deckers in whole districts. A shorter chimney beside a three-story neighbor can sit in that building’s wind shadow.
Fireplaces low in the house
Many local houses have raised basements and interior chimneys. The lowest floor is where a house most wants to draw air in, so a fireplace or stove there suffers first, and in winter it may pull that air down the flue.
Housing ages, heating fuels and storm history come from the sourced notes on our community pages: New Bedford, Dartmouth, Fairhaven, Acushnet.
How we find the cause
Draft problems rarely have a single source, so the visit is a process of elimination, starting with the simplest explanations and moving outward from the flue.
Clear the simple suspects
A nest, fallen tile, a stuck damper or heavy creosote can all choke the flue. These are checked first because they are the quickest to put right.
Compare opening and flue
We measure the fireplace opening against the inside size of the flue. When the opening is too big for the flue, smoke spills out the front however clean it is.
Study the top and surroundings
The height of the stack is compared with the ridge, nearby roofs, trees and taller buildings that can disturb the air around the flue outlet.
Test how the house breathes
With windows shut and exhaust fans, the dryer and other appliances running, we see whether the house is drawing air down the chimney to make up for what it loses.
Agree on the remedy
Depending on what turns up, the fix may be a wind-directional cap, a taller flue, a glass or metal smoke guard across the opening, damper work, a new liner, or a draft fan.
Some causes lie with the house rather than the chimney, such as a powerful kitchen hood, and the answer may involve another trade.
We retest after the work where the weather and conditions allow, and tell you straight if a change only helps part of the way.
Symptoms of a draft problem
These usually point to draft rather than to a dirty flue, especially once the chimney has been swept.
- Smoke rolling out at lightingA puff into the room when the fire starts, which settles once the flue warms, is the most common complaint.
- Cold air from an idle fireplaceA steady chill or a draft at the hearth when nothing is burning means air is flowing down the flue.
- Soot smell on windy daysAn odor from the fireplace that comes and goes with the wind points to the top of the chimney.
- Trouble after a renovationNew windows, insulation or a big range hood can change how the house pulls air and start smoking that was never there before.
- Smoking from one level onlyIf a basement fireplace smokes while an upstairs one draws fine, pressure inside the house is the likely reason.
Downdraft work, or something simpler first?
This service fits a flue that is clean and clear but still smokes, or one that lets air in when it should be still. If the flue has not been swept lately, start there.
Ask for downdraft repair when
- Smoke spills into the room during fires
- Cold air or smell comes from an unused fireplace
- The trouble began after windows or insulation
- Smoking depends on which way the wind blows
Ask about a different page when
- A flue that has not been cleaned recently: Chimney Sweeping
- Weak draft that no chimney change can cure: Chimney fan installation
- A damaged or badly sized flue: Chimney Liner Installation
What shapes a downdraft job
The diagnosis is the same kind of visit for everyone. The fix that follows can be small or large, depending on these factors.
- Where the cause sits
- A blocked flue or a stuck damper is a small repair. Raising a stack or relining it is a much larger piece of work.
- How many causes overlap
- Often an oversized opening, a short stack and a tight house all add up. Fixing one may help without solving the whole problem.
- The chimney’s height and roof
- Work at the top of a tall chimney or a steep roof takes more setup than changes made at the hearth.
- Whether the house needs changes
- If the house itself is starving the fire of air, part of the answer may be outside chimney work, such as a supply of outdoor air to the room.
No price list on this site, on purpose. Two chimneys that sound the same over the phone rarely are. Once someone from the New Bedford office has looked at yours, you get the scope in writing and decide from there.
Downdraft questions we get from local homeowners
Why does it only smoke when I first light the fire?
A cold flue is full of heavy, cool air that resists the smoke. Until the flue warms, the fire has little draft to work with. Opening a nearby window slightly as you light, or warming the flue with rolled paper held near the damper, often helps. If it persists, the flue may be too small for the opening.
Will a new cap fix it?
Sometimes. A wind-directional cap can help when gusts at the top are the main cause. It does nothing for a flue that is too small, a house that is short of air or a chimney that is simply too low. That is why we look at all of those before suggesting one.
The smoking started after we put in new windows. Why?
Older houses leak air, and that leakage used to feed the fire. Tighter windows cut the supply, and exhaust fans or a dryer can then pull air down the easiest path, which is often the chimney. Fixes include closing or slowing those fans while burning, or bringing in outdoor air.
Can you just make the chimney taller?
Extending the flue is one remedy for a stack that sits too low against its roof or a neighboring building. Whether it suits yours depends on the structure, how it looks and whether the local building official needs to sign off. We explain the options with photographs before you decide.
What is a smoke guard?
It is a strip of glass or metal fixed across the top of the fireplace opening. It makes the opening smaller, so a modest flue can handle the smoke from it. It is a simple, often effective fix when the opening is too large for the flue above it.
Booking, hours and general chimney questions are on the main FAQ; how a visit runs is on what to expect.
Often looked at alongside
- Chimney fan installationA powered exhauster mounted on the flue top for chimneys that cannot draw reliably by themselves.
- Chimney Cap InstallationMeasuring each flue and fixing a screened stainless or copper hood over it against weather and wildlife.
- Smoke Chamber RepairParging stepped, rough or cracked smoke chamber walls into a smooth, sealed slope above the damper.
- Damper Repair and InstallationFreeing or replacing rusted throat dampers, or fitting a top-sealing damper up on the flue tile.
Background reading
- 7 minThree-Decker and Two-Family Chimneys in New Bedford: What Owners Should KnowSeveral flues in one stack, gas boilers in old coal flues, tall tops in the harbor wind: how to look after a multifamily chimney.
- 6 minSalt Air, Wind and Coastal Chimneys: What the South Coast Does to Masonry and MetalWind off the water drives rain into masonry and salt into metal. What that means for caps, flashing, crowns and mortar near the coast.
- MapThe four places we coverNew Bedford · Dartmouth · Fairhaven · Acushnet, all from one office downtown.