Shoutout to the guy at the Madison recycling center who said my corrugated was too thin
I was building a three foot tall castle tower out of boxes I grabbed from behind the grocery store on Park Street, and the first version buckled at the base about ten minutes after my kid climbed on it. The guy at the drop off center told me to double up the walls and run the flutes in opposite directions, so I glued two layers with the ridges crossed and it held all weekend. Does anyone else flip their corrugation direction, or do you just use the thick double wall stuff and call it a day?