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Depends on the size of the block.
However, an house brick is 9" x 3" x 4"
So assuming the brick is laid 9" long and 3" high a single course of wall would require!!!
21 x 12 = 252 "
Hence 252 / 9 = 28 bricks for the length
&
9 x 12 = 108 "
Hence
108 / 3 = 36 bricks in height
Hence 36 x 28 = 1008 bricks is required!!!!
If you wanted a double course wall (for support) that is 8 " wide. Then you need twice the number of bricks which is 2016 bricks.
To calculate the number of blocks needed to build a retaining wall, you first need to determine the area of the wall. In this case, the area is 21ft (length) x 3ft (height) = 63 square feet. Next, you need to know the size of the blocks you are using. Let's assume each block covers 1.5 square feet. Therefore, you would need 63 square feet / 1.5 square feet per block = 42 blocks to build the retaining wall.
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If 400 bricks measuring 81 by 31 are required to build a wall 42 ft high how long is the wall?
169''9
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Traditional Concrete Masonry Unit (CMU) Blocks have 2 rectangular voids through the block. These voids are called "Cells". The face shell thickness is the thickness of the block material from the cell to the front of the block. For example, a typical block of dimensions 8"high by 8"deep by 16" long probably has a face shell thickness of 1.25".
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They plant vegetation, build terraces, and build retaining walls.
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I think: 2250
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