A chimney is safe to use when the flue is clear of creosote and blockages, the liner is intact, the crown and cap keep water out, and clearances to combustibles are correct. The only way to be sure is a professional inspection.
The safety checklist
Clear flue, intact liner, sound crown and cap, sealed flashing, solid masonry, correct clearances, and a damper that opens and seals. Plus working smoke and carbon monoxide detectors in the home.
Warning signs it is not safe
A strong campfire smell, smoke pushing into the room, water in the firebox, falling masonry, or any carbon monoxide alarm. Stop using it and get it checked.
Why a camera matters
Hairline liner cracks can let heat and carbon monoxide reach framing, and they are invisible from below. A Level 2 camera inspection is how you confirm the liner is sound.
Frequently Asked Questions
Can I tell if my chimney is safe myself?
You can spot obvious signs, but only a camera inspection confirms the flue liner is intact.
It has not been used in years. Is it safe?
Not until inspected. Animals, debris, and deterioration are common in unused chimneys.
What if I smell gas or CO?
Stop using it, ventilate, and get it inspected immediately.
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