chimney down draft

Bonjour everybody, Since 20 years, i have a wood stove on the first floor connected to a chimney that is outside an external wall. I noted since 3 ou 4 years there's sometimes a smoke odor coming from the stove and/or from the chimney flue. I installed this summer two roof vents when renewing roofing but nothing goes better. My home is a two level house and chimney goes 36 inches over roofing. How to fix it ? Thanks before i die of asphyxiation !!! (Joke)
Ren from Quebec state.
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Ren Fradette wrote:

No joke. You need to immediately schedule a chimney sweep, and have an experienced contractor inspect the chimney itself for leaks and damage.
I would also get a carbon monoxide alarm.
There should be no, repeat no, smoke inside your attic under any circumstances. Roof vents exist to let the house 'breathe' but they are not a backup for a leaky chimney, which should create the proper suction through heat to vent all of its smoke.
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"Ren Fradette" wrote:

Make sure the chimney is clean, but just cleaning it probably won't help. Chimney down drafts are a common problem. Which wall is the chimney on? Heat from the sun on a south facing chimney may aggrevate the problem. Do you keep the stove air shut tight when you don't have a fire? So, what happened 3-4 years ago? trees grow higher and change air flow?
Adding a cap might help, especially one of those that you see on the coast and turn with the wind. Is there a clean out at the base of the chimney, has it been cleaned out, is it open?
If you can't figure out the problem, put a damper in the stove pipe near the entry to the chimney would likely help, keep it closed whenever you don't have a fire.
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