I was wrong on the CF of sand in 50 pounds. I made the mistake of going to an 'ask' site…which obviously gave me the wrong answer. And I didn't question the answer…as I should have.The cubic foot calculation is correct, but the 3 cubic feet per bag is off.
Depending on particle size/moisture/ etc, sand is about 100 lbs per cubic foot, so a 50 lb bag is about 0.5 cubic feet.
21.3 Cubic feet / .5 cubic feet per bag is 42.6 bags.
2 inches is not a lot of sand for a chicken to play in, they will mixing it in with the gravel in no time at all.
I use sand in the coop, it's easy to clean, but the run is straw over dirt.