Did you manage to avoid fire growing cannabis Keith?
Unfortunately, one time only, I did burn down my shed (I was 24 and it was a rental so it wasn't mine really) by accident with a HID MH setup. My landlord knew I was growing in it, and accepted produce for part of the rent (he was an attorney in NO). I was freaking out, thinking the popo or fire dept would show up, but I got it wet down and put out with a couple of hoses. It was NO so sometimes the popo is slow in responding unless there are gunshots involved. Scared shitless, as I had over a pound on hand, a felony distribution charge if caught. I rebuilt the shed myself, but didn't grow again until I bought a house of my own two years later. My first child was growing in my wife at the time, and I thought I better grow up and be more careful.
Like I am now ... NOT!