Millcreek · Salt Lake County
Fireplaces That Smoke or Will Not Draft in Millcreek
A fireplace that has always worked and has suddenly started spilling smoke is usually telling you something about the house, not about the chimney.
Fireplace calls in Millcreek arrive as one of three complaints: it smokes into the room, it will not stay lit, or something inside it has visibly broken. The first two are draft problems and the third is a materials problem, and they get diagnosed in completely different ways.
Draft is a pressure contest
A chimney pulls because the hot column of air inside it weighs less than the cold air outside. Anything that weakens that column, or that offers the house an easier place to draw air from, wins the contest instead.
Two things make this common here. Homes below the canyon mouth sit in cold air that drains downslope after sunset, and when that air presses on the top of a chimney it can stall or reverse a marginal draft at exactly the hour people light a fire. Separately, the mid-century houses across Millcreek have been steadily tightened over the decades with new windows, added insulation and sealed rim joists. A tight house running a furnace, a range hood and a basement dryer has nowhere left to draw make-up air from except the flue.
The test costs nothing. Crack a window near the fireplace and light it. If the smoking stops, the chimney is fine and the house is starving it, and the answer is combustion air rather than masonry work.
What breaks inside a firebox, and what we will not sell you
Firebrick and refractory mortar move every time they heat and cool, and after enough seasons the joints open up. Gaps wider than a coin need attention, because what sits behind that firebrick is framing. Throat dampers warp and stop seating. Smoke chambers built with the corbelled brick left rough create turbulence right where the smoke needs to accelerate, and parging one smooth has fixed fireplaces that owners had been told were beyond help.
What we will not do is sell you a taller chimney, a new damper or a liner before proving the draft problem is where we say it is. Smoke behavior is measurable. A fireplace that fails a pressure test and passes a masonry inspection needs an air supply, not an invoice for brickwork.
Questions
Fireplace Repair in Millcreek — common questions
My fireplace only smokes in the evening. Why then and not in the morning?
That pattern usually points at cold air draining off the bench after sunset and pressing down on the flue, often combined with the furnace running harder at night. It is a pressure issue, and the fix is frequently make-up air or a top-mounted damper rather than masonry repair.
Can cracked firebrick wait until next season?
It depends how wide. Hairline cracks in the face are normal and can be watched. Open joints, missing pieces, or anywhere you can see through to something that is not firebrick should be repaired before the next fire, because the material behind it is not rated for that heat.
Would glass doors fix a fireplace that spills smoke?
Sometimes, for an honest reason: doors reduce the opening the chimney has to serve, which improves the ratio between opening and flue. That is a legitimate fix for a slightly oversized opening, but it will not overcome a house held under negative pressure.
Is a fireplace that never smoked before suddenly dangerous?
Smoke in the room means combustion gases are in the room, carbon monoxide included, so it should not be ignored. It does not automatically mean the chimney is damaged. We look for a blockage or a nest first, then test the house pressure, then inspect the masonry.
Also in Millcreek
Our other services here
Chimney Sweep Inspection Chimney Repair Installation Gas Fireplace Caps & Dampers Dryer Vents All Millcreek services
Nearby
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