On March 18, 2017 at 08:16, thecapnredfish said...
And all supported on 2x4 walls.
That's fine, as long as they don't decide to store a lot of heavy things on top when they become bored with it. A single 2x4 can support 1100lb of weight, as long as it's plumb. Well, a good 2x4, not the crap from big box stores.