I am preparing to place a 10X10 deck above a grassy area. I will be placing 4X4's in a box like frame and go from there.
My question is: I have the lumber and cement mix to do the job, but the 4X4's are 12' and I need the 4X4's to be plumb and exactly square (10X10). How do I make sure this is completely sqaure.
By the way, The 4X4's are 12' high because it will act as a trellis as well (in the future).
Thanks for your help.