I know that double row stacked firewood is slightly slower drying than single rows. That said, due to space limitations, I double stack on pallets with about 8 inches or do of space between rows. I top cover with tin roofing the double rows (one solid piece of roofing over both rows). I got to wondering about the airflow in between rows and wondering if the airflow would be sufficient in between rows, underneath tin roofing to carry away evaporated moisture from the stacks. What do you think?