I have a bunch of gray birch in an easy to down location. I know they are not the best BTU, but I try not to be a wood snob. My question is, if I bring them down, cut them into rounds now and split them in spring, will they turn punky by the time I'm ready to burn them in 2015-16? I keep the rounds on pallets, and they get full day sun (uncovered). When split in spring, they will be stacked off the ground with just the top of the pile covered. Thanks for any opinions, have not burned any gray birch as yet, and would hate to do all that work for a bunch of punky wood.