You need to start at the bottom and work up. I just did this at my house. I most certainly built the chimney before I roofed too......there isn't to much room to play with the piping because its actually 2. Pipes, one inside the other. Plus, when you do the cap, it needs to be centered so it works correctly. Go to Doug Ashy. That's where I got mine, and look at the instruction book. That'll give you a better idea......... I wish I had gotten the largest they had now that I'm using it......
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