How do you check a chimney before using the fireplace?
Short answer. Before the first fire of the season, check from the yard that the cap and crown are intact and nothing is leaning or missing, then at the hearth open the damper, shine a flashlight up the flue for nests, debris or heavy black buildup, and confirm smoke and carbon monoxide alarms work. If you see glazed creosote, cracked liner tiles or a blocked flue, or it has been a year since the last inspection, call a certified sweep before lighting it.
From the yard
- Is the cap in place, not rusted through or tilted?
- Any missing or loose bricks, or a crumbling crown?
- Does the chimney stand straight, with no gap where it meets the house?
- Are branches within about 10 feet of the top? Trim them back for spark safety.
- Use binoculars. Do not climb onto the roof to look.
At the hearth
- Open the damper fully and make sure it moves freely and stays open.
- With a strong flashlight and a mirror, look up the flue. You should see clear liner and daylight or the cap screen, not a nest, leaves or debris.
- Scrape the smoke shelf or flue wall with a fireplace tool. Soot or creosote around 1/8 inch thick, or any shiny, tar-like glaze, means it needs sweeping first.
- Look for cracked or missing liner tiles, loose firebrick or wide gaps in the firebox mortar.
- Check for water stains or rust on the damper, a sign of a missing cap or crown problem.
Safety basics
- Test smoke and carbon monoxide alarms.
- Have a screen or glass doors and a metal ash container with a lid.
- Start with a small fire of dry, seasoned hardwood and watch that smoke draws up, not into the room.
A yearly inspection by a sweep certified by the Chimney Safety Institute of America is still the standard. For the roof side, see chimney leaks and crickets and the roof maintenance checklist.