Back when i was logging ,and whole tree chipping i had about 2 boxes,200 cubic yards piled up for a few weeks. It would get hot and steam in the pile. Out of curiosity i took a automotive temp guage with about a 7' lead taped it to a piece of strapping and stuck it in the pile. the temperature was betwee 140-150 degrees F. at the big biomass plants where they have 1000's of yards piled up to 60 ft high they have to keep turning it over to keep it from catching fire.
