I'm about to build a base for my two rain barrels, 55 gal each. I plan on them being side by side, approx. 30 inches off the ground and I'd like to use regular 2X4's vertically to build this with a plywood top. These two barrels will weigh over 900 lbs total when full.
How can I calculate how many vertical supports I require so the 2X4's don't collapse under the weight? The floor surface is a wooden deck, but if necessary I can install 2X4's flat on the deck to help spread out the load.
I found this website, but I don't know how to use the numbers as for sure the length of the 2X4 makes a difference.
NEW JERSEY MARIJUANA DISPENSARIES