Most 2 x 4s will be 1 1/2 x 3 1/2".
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Can be eight or eleven feet long. In actuality, it can be as long as you want. 2x4 refers to the width and height dimensions of the plank, not the length. So I could cut a 2x4 to 2 inches long and it would be a 2 inch long 2x4.
8
20x20 = 400 2x4= 8 400/8= 50 needed
You will need at least 13-9' 2x4's, on 16" centers, and 2-16' 2x4's for plates. (Deduct plate thickness from stud length)
2x4's have a weight that varies based upon wood and length. With this said, the weight generally runs at about one point twenty-eight pounds per foot in length. Thus, an eight foot 2x4 would run about eleven pounds.