To determine how many 2x4x8 boards you need for an 8-foot wall, you first need to know the spacing of the studs. Typically, studs are placed 16 inches apart on center. An 8-foot wall requires approximately six studs (including one at each end), so you would need about 6 boards, assuming you are using the entire length of each board for the wall studs. Additionally, you may need extra boards for top and bottom plates, so it's wise to purchase a few more.
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There are different sizes of brick. You will need to know how many bricks are in a square foot, including the mortar joint.
Okay, this requires a little simple math and some three dimensional thinking. For the fence (wall) planks alone, you will need 55 eight foot 2 x 4's. For a simple box frame you will need another 8. 55 + 8 = 63 The problem is, the fence (wall) will not be free standing. You'll need three twelve foot 4 x 4 posts (twelve foot long, because four feet of them will be set into the ground.
A cinderblock is 8" by 16" if you include the mortar joints.You'll need to figure out how many square inches the cinder block is (8 X 16)and how many square inches the wall is. (1 square foot equals 12" x 12")Divide the size of the blocks into the size of the wall and that's how many blocks you'll need.You'll also need to start doing your own homework.Getting people to do it for you on-line is the same as cheating.
6o bricks
144/8 = 18