Rant: I thought sweeping from the top down was backwards until a job in Cincinnati proved me wrong
I always brushed bottom to top because that is how the old guy who trained me did it. Last week I was on a two story brick house near Cincinnati and the creosote up top was glazed hard as glass while the bottom was powder. I started from the top for the first time in 11 years and the whole flue cleared in 40 minutes instead of the usual hour and a half. The powder at the bottom just swept right out after, it never clogged my brush once. Anyone else switch direction based on how bad the glaze is up top?
That 40 minutes versus the hour and a half number is what gets me. When you went top down on that Cincinnati job, did you run a smaller brush first to break up the glaze, or go straight at it with your normal size? I ask because glazed creosote up top is like chipping at a candle, and I have had brushes skip right over it and leave glass behind. On a two story I would guess you were working off a ladder or a roof setup, so did you keep the same brush the whole way down or switch as the flue changed? Curious what your rod setup looked like too, because feeding from the top on a tall flue is a different feel than pushing up from the bottom.