no. of frames =area of room /area of a frame.
area of a frame= 2X4 square cm.
area of room= 22X 22 square cm. no.of frames =22 X22 / 2x 4 = 60.5 .
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20x20 = 400 2x4= 8 400/8= 50 needed
Builders will normally order 1 per foot when framing 16" on center to cover the cripples and corners. This does not include the wood required for the bottom and top plate.
75
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)
Standard studs are spaced 16" apart. 30 feet times 12 inches = 360 inches. 360 inches divided by 16 inches = 22.5. If you are measuring left to right, the right-side stud from the frame becomes the last one. Depending on how you will compensate for the extra 8" at the end, you will need 21 or 22 2x4s.