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CONCRETE BLOCK MODULAR TABLE USING 3/8" JOINTS

    No. of Block in Height  
  Wall Height or Length 4" high units 8" high units No. of 16" Block in Length
  0' 4"
0' 8"
1' 0"
1' 4"
1' 8"
2' 0"
2' 4"
2' 8"
3' 0"
3' 4"
3' 8"
4' 0"
4' 4"
4' 8"
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1/2
1
1 1/2
2
2 1/2
3
3 1/3
4
4 1/2
5
5 1/2
6
6 1/2
7

-
1/2
-
1
-
1 1/2
-
2
-
2 1/2
-
3
-
3 1/2

         
  5' 0"
5' 4"
5' 8"
6' 0"
6' 4"
6' 8"
7' 0"
7' 4"
7' 8"
8' 0"
8' 4"
8' 8"
9' 0"
9' 4"
9' 8"
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
7 1/2
8
8 1/2
9
9 1/2
10
10 1/2
11
11 1/2
12
12 1/2
13
13 1/2
14
141/2
-
4
-
4 1/2
-
5
-
5 1/2
-
6
-
6 1/2
-
7
-
         
  10' 0"
10' 4"
10' 8"
11' 0"
11' 4"
11' 8"
12' 0"
12' 4"
12' 8"
13' 0"
13' 4"
13' 8"
14' 0"
14' 4"
14' 8"
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
15
15 1/2
16
16 1/2
17
17 1/2
18
18 1/2
19
19 1/2
20
20 1/2
21
21 1/2
22
7 1/2
-
8
-
8 1/2
-
9
-
9 1/2
-
10
-
10 1/2
-
11
         
  15' 0"
15' 4"
15' 8"
16' 0"
16' 4"
16' 8"
17' 0"
17' 4"
17' 8"
18' 0"
18' 4"
18' 8"
19' 0"
19' 4"
19' 8"
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
22 1/2
23
23 1/2
24
24 1/2
25
25 1/2
26
26 1/2
27
27 1/2
28
28 1/2
29
29 1/2
-
11 1/2
-
12
-
12 1/2
-
13
-
13 1/3
-
14
-
14 1/2
-
         
  20' 0"
22' 0"
24' 0"
26' 0"
28' 0"
30' 0"
32' 0"
34' 0"
36' 0"
40' 0"
50' 0"
60' 0"
100' 0"
160' 0"
60
66
72
78
84
90
96
102
108
-
-
-
-
-

30
33
36
39
42
45
48
51
54
-
-
-
-
-

15
16 1/2
18
19 1/2
21
22 1/2
24
25 1/2
27
30
37 1/2
45
75
120
         
 
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

 
Examples of wrong and right planning of concrete masonry wall openings
 

 

 
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