Interesting, looks like a will protected hearth as well as noncombustible surroundings, obviously though something went seriously wrong.
Yeah the stove and all piping was professionally installed Class A double wall pipe. The hearth was beyond overbuilt, clearance to combustibles exceeded on all sides. I even built the hearth so it was impossible to get within C2C range unless you put something on the pad itself that shouldn't have been there. I have lost sleep over it the past few days going over every possible scenario. At this point im glad no one was hurt but breaks my heart all the hard work and $$ I put into that house is gone.