It was time to make a bonfire and burn wood shingle (what use to be a roof cover). At the end of Summer (2015) our bonfire place ready to be set on fire, also it was very large. I still decided to wait for a rainy day, to minimize fire risks.
I negotiated with our construction worker, who turned out to be a semiprofessional industrial burner (10 years in forestry), called to the local fire station and asked for permission, informing about precise location. They have local watch towers, and just to make sure there is no misunderstanding it's good to inform local authorities (it might be even requested by law).
For me, it seemed like a simple task - pour with petrol that large pile of shingle and it's done. My burner told me - that instead of pouring all pile you need to start small and direct fire to the rest of pile, or more correctly transship the pile to the bonfire. I trusted him and meanwhile built a doghouse for Bob.
Located next to the small pond, set on fire on rainy day
Instead of starting to burn that large pile all at once, burner did set a fire on much smaller bonfire, latter he took coals and inserted at the end of larger pile, and then from the other end of pile moved shingle to burning side.
At the end of the day - it was done. Thus continued to smolder for couple of days.