We have been gone for six yrs. but are back and waiting for cold weather to try and heat are new home,we purchased this home as a forclosure and it has a clayton wood furnace and a large stone hearth pad that we just put a new mansfield on now for the question this home has a very large weak old deck that must be replaced not so much because of rot but poor constuction post have been heaving from incorrect building so yes it is old treated pine that is dry and most paint is gone and i was cosidering burning it small amount at a time in the clayton furnace is this an absolute no no or would most guys use it for starting fires i have heard conflicting stuff about old trated wood thanks and its good to be back here!