Actually it's only a 2x4 with a 1x2 loft, so it is actually big enough for 3 pigs. A little more than 13 sq. ft. I was an inch short with the coroplast for both levels with one 4x8 sheet, I could have made do, but I wanted coroplast to play around with and make other things out of anyhow, so I just went ahead and got two.