1. Actual overall wall
length: subtract thickness of one mortar joint.
2. Actual opening dimensions: Add thickness of one mortar joint
to height and width.
3. Block quantities required 100 Sq. feet of wall area. 8”
high, 16” long, 113 blocks; 6” high, 16” long,
150 blocks; 4” high, 16” long, 225 blocks.
4. Multiples of 8” will always be even feet (2’-
0”, 4’-0”, 6’-0”); or even feet
plus 8” (2’-8”, 4’-8”, 6’-8”),
Odd feet plus 4” (1’-4”, 3’-4”,
5’-4” 0.
5. To determine the number of block required for a wall, find
the square feet of the wall and use the following calculations:
4” high x 16” long block
– multiply Sq. Ft. by 2.25
6” high x 16” long block – multiply Sq.
Ft. by 1.5
8” high x 16” long block – multiply Sq.
Ft. by 1.125
4” high x 18” long block –
multiply Sq. Ft by 2
6” high x 18” long block – multiply Sq.
Ft by 1.333
8” high x 18” long block – multiply Sq.
Ft by 1
6. To determine the number of block required
per course, use the following calculations:
16” long block –
multiply length of wall .75
18” long block –multiply length of wall by .667
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