I used Ana White’s Adirondack Chair plan for these chairs. I used the cheapest 1×4 cedar planks I could find. This was before the days of owning a nail gun, so there are a lot of screws and glue. I also did not have a jig saw at the time, so the top is square and flat rather than rounded. I don’t mind. They’ve held up well the last few years and have done their job.