This is one of my Adirondack chairs made out of thick stock, i.e., the armrest are 6/4. It is a heavy chair made out of STK (small tight knots) Western Red Cedar and assembled with stainless steel hardware.
Thanks for the comments - the reason I went with the thick look, I think it looks cool, and you're probably right that it would survive the fallout, or truck parked on top of it… The plans that I used with a little tweaking was from FineWoodWorking.com by Tom Begnal - Curved-Back Adirondack Chair. I moved the arms out 2" so the average American butt can fit into it, and used thicker dimension. The Western Red Cedar I purchased at http://www.simmenlumber.com/ in Sacramento, CA… Thanks for the feedback!!!