I sweep each year and i also run some powder that burns and catalyzes the conversion of sticky creosote into black soot dust that wont burn.
I had a chimney fire when i lived in SW Wa as a new homeowner. We'd burned a bunch of crappy wet wood the previous year and that likely gunked up the works.
It could have burned the whole house down.. .I was just getting ready to go our and run the dog sitting in the living room putting on my shoes and I heard this giant whooshing sound.... It was the sound of air being sucked into the woodstove...
I ran over and shut off the air intake and ran outside and looked up at the chimney pipe... .flames were shooting up out of it! It looked like a rocket had hit my roof and was still roaring.
I grabbed my garden hose and turned it on and ran in the house and opened the stove door and blasted the fire out... a giant whoosh of steam either put out the fire in the pipe or it burned out on its own.
The fire dept came out and sent a couple of 300 pound 6'6'' guys and gear stomping around on my roof and I thought they'd fall through, but they didn't.
Ever since then, i run a brush through each year and run creosote catalyst powder... haven't had a lick of trouble since.
These are douglas fir trees and they are dry and burnable now... Ive got about 3 cords set up for this winter and spring... .hope that will last us through. My buddy has 80 acres in the Siskiyous and it is mixed oaks and firs and manzanita.
These trees were already down and mostly limbed, all I had to do was buck them into rounds and load them and drive them into the Rogue Valley and unload them and cover them. I have a hydraulic hand operated splitter that is slow, but very effective. Buddy let me borrow his truck and saw, I managed to break the chain brake /plastic handguard thing somehow, so I ordered him a new one for $35 and Put $100 worth of diesel in his rig. Even with those expenses, i still feel good about the day. Was gorgeous out there... .I think he is about 1 mile into Oregon from N Calidornia.
Feels good to do a hard days work that I know will keep us warm this winter.