Vertical supports? Are your taking about the base or the walls? If you mean the walls I have 17 on the back wall, and 8 on each side wall. And 8 on the front wall WITH 10 stacked 2x4s. I'm not sure where you got 13 from?
As for the horizontal spans on the base. I see where you're talking about in the pics that I posted, unfortunately I didn't take pics of when I added vertical supports on the base. But, I did add vertical supports in those horizontal spans. So thats taken cared of.
Please respond back as I'm unclear on the 13 vertical supports youre taking about. I'm not trying to argue, just trying to see what you're talking about so I can fix it. I'm not opposed to over building
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