I found this on a different forum and thought it might be good for those of you that thought class A chimney pipe is expensive!
This afternoon, I got the chimney for my wood stove hooked up in my garage. I started a fire in it and the garage was warmed up to about 60 degrees(it was 30 outside). While I was working on my Jeep, I noticed smoke started to lower in the garage. Sure enough, the chimney pipe had started the roof of my garage on fire and was burning its was down the wall! I ran to grab the hose, but my heart skipped a beat as I found out it was frozen! In a panic, I remembered I had a fire extinguisher in the shed, so I grabbed that, climbed a ladder, and tried putting out the fire. It kept burning, so I called 911. I ran inside and started filling one gallon pails of water. I was able to nearly get the fire out by the time the fire department got there. The damage is minimal, but several things got wet. I also have a heaping pile of insulation and wood to clean up tomorrow. I lucked out tonight since there was no wind and the fire started at the peak of the roof.
If you install a chimney, be sure to use double walled pipe, not single walled!
This afternoon, I got the chimney for my wood stove hooked up in my garage. I started a fire in it and the garage was warmed up to about 60 degrees(it was 30 outside). While I was working on my Jeep, I noticed smoke started to lower in the garage. Sure enough, the chimney pipe had started the roof of my garage on fire and was burning its was down the wall! I ran to grab the hose, but my heart skipped a beat as I found out it was frozen! In a panic, I remembered I had a fire extinguisher in the shed, so I grabbed that, climbed a ladder, and tried putting out the fire. It kept burning, so I called 911. I ran inside and started filling one gallon pails of water. I was able to nearly get the fire out by the time the fire department got there. The damage is minimal, but several things got wet. I also have a heaping pile of insulation and wood to clean up tomorrow. I lucked out tonight since there was no wind and the fire started at the peak of the roof.
If you install a chimney, be sure to use double walled pipe, not single walled!

Hilly, glad it wasn't worse. They say most of us aren't smart enough to learn from other people's mistakes. Hopefully you just reached someone who is smart enough!