If the firewood pieces aren't all approximately the same length the rows get too far apart, and the stacks get wonky. I dry for 3 years so I don't need or want much space between.
I can usually hit 16 +/- 1” pretty easily without measuring but I’ve been cutting firewood for almost 50 years. Our own wood stove has a shorter firebox than my parents had while I was growing up (I made all their firewood by the time I was 15 and some of it starting when I was in grade school). That took a little adjustment because I used to cut them about 20” long.
Those longer pieces could be stacked higher outside, and remain stable.
My parents and I both moved out of that old house on the edge of town on the same year. They moved onto my moms parents farm, where they have a natural gas well and no more need for firewood.
I got married and my wife and I moved into a 1000 ft addition that my brother added to the back of my grandma’s (on my dad’s side) 1000 ft ranch house. We put in the small wood stove then.
There were a couple of old 36’ x 46’ x 16’ timber framed barns here, that my great great grandad had put up in the 1880’s. I stored my firewood in one of those for about 15 years. It seasoned very well, stacked inside and I would always cut enough to stay 4-5 years ahead.
Unfortunately, the barns had to be replaced after the roofs and foundations failed at the same time. Maintenance had not been kept up in the years since my grandpa had passed. I dismantled the old barns and salvaged most of the wood that was still solid (mostly American chestnut).
I used a lot of that to make shops and a loft inside my new pole barn. My latest “project” was the woodshed on the back of that Stockade building’s back porch. I used some of the 9” and 6” square hand hewn timber’s for framing, along with the sawed oak rafters and chestnut siding boards. I also cut up some of the old white oak floor planks from those old barns for “sticker” boards to hold my stacks up.
The woodshed lean-to is 7 ft wide x 25 ft long and I can stack the firewood floor to roof inside by hand. I would have made it wider, but the roofing tin sheets (Extra pieces used by Stockade to protect the tin siding and roofing during shipment) were only 8 ft long.
The stacks of 16” long firewood are quite stable inside there, up to 9 ft high. It probably helps a lot, that they are just 7 ft wide.
Maybe someday, after all the dying ash is cleared (that don’t need much seasoning time), I’ll go back to cutting 4-5 years worth, and use the full 24 face cord capacity of that woodshed. For now, staying just two years ahead and using half of it works real good. Plus I can keep my field car (Durango) out of the weather.
I had my firewood stacked outside on pallets for a few years, after I took down the last of the old barns and before I completed the woodshed. I hated that. There’s not much worse than dealing with tarps under snow (I covered the tops of the stacks with tarps), and those 16” pieces could not be stacked very high.
The woodshed works great. I have a stone driveway around back. The side porch on our house (right next to the wood stove) holds 1/2 face cord which is about what I can fit in my tractor bucket. When I use that up, I can have it refilled in minutes, no matter how deep the snow is outside.