If your fireplace isn't drawing well, it's important to figure out what's causing the problem — and fast. A poorly drafting fireplace or fuel-burning appliance is both a safety and maintenance hazard. Weak draft leads to inefficient burning, more creosote buildup inside your chimney, wasted fuel, smoky rooms, and, in the worst cases, dangerous levels of carbon monoxide inside your home.
If your fireplace usually draws well but has suddenly become smoky or hard to keep lit, there are a few obvious things you should check before calling in a professional.
Start With the Damper
First, make sure your damper is fully open. It should stay closed when the fireplace isn't in use — this prevents cold air from flowing down the chimney and keeps squirrels, bats, and birds out. But it's easy to forget to open it before starting a fire, which is one of the most common causes of a smoky room.
Check for Obstructions
If the damper is open and the fireplace still isn't drafting properly, carefully climb onto your roof (or hire someone to) and use a flashlight to look inside the flue. You're checking for two things:
- No animals or other obstructions such as bird nests or dry leaves.
- Signs of excessive soot and creosote buildup, either inside the flue or on the spark arrestor mesh around your chimney cap (if you have one).
Physical blockages and heavy buildup are two of the most common culprits behind sudden draft problems.
Weather and Wind Can Play a Role
Once you've cleared any obstructions and cleaned the flue, your fireplace should return to normal. But weather and wind can also impact draft — especially when starting a fire before the chimney liner has warmed up. If your fireplace has chronic drafting problems, it's worth consulting a chimney and fireplace specialist who can evaluate your system's configuration.
Structural Issues That Affect Draft
A specialist might discover that your flue's interior is too small for the appliance you're using, or that your chimney isn't tall enough for optimal draft. In many cases, installing a flexible metal chimney liner in an unlined chimney — or adding a wood-burning insert — can dramatically improve draft. A metal liner insulates the flue from the surrounding chimney structure, so combustion gases stay hotter as they rise and create a stronger updraft than cooler gases would.
Adjust Your Fire-Building Technique
If a major modification isn't in the budget, tweaking your fire-building routine can help. As a rule, a small, hot fire will draw far better than a large, cold one — and well-seasoned wood always outperforms green wood. Simple changes like these can make a noticeable difference in how your fireplace performs.