I read pressure treated wood is coated in a copper solution solution that reacts with aluminum. Have you noticed any issues where the aluminum touches your treated wood yet?
I know its much less than .063 thickness. I think it was around .03 to .04 thickness. If I had it to do over again, I think I would put in a .063 thickness marine grade aluminum. I think its called 6061 grade. I could be wrong, but I know its a 4 digit number for the grade of aluminum.
