The figures shown below are intended for “rule of thumb” use only.

Unit Quantities

  • 2 1/2 High Block (21/4x8x16)–3.10 block per SF of wall area

  • Half High Block (4x8x16)–2.25 block per SF of wall area

  • Standard Block (4”, 8”, 10”, 12”)–1.125 block per SF of wall area

  • Face Brick Modular–7.0 brick per SF of wall area

  • Oversize Brick–6.0 brick per SF of wall area

  • Utility Brick–3.0 brick per SF of wall area

Mortar Quantities

  • Block–3 bags per 100 block

  • Face Brick Modular–7 bags per 1000 brick
    Oversized Brick–8 bags per 1000 brick

  • Utility brick–10 bags per 1000 brick

Sand Quantities

  • Sand–1 CY per 7 bags mortar

Horizontal Wall Reinforcing Quantities

  • Horizontal Wall Reinforcing–SF/1.33

Cavity Fill Insulation Quantities

  • Cavity Fill Insulation–4 CF per bag

Approximate Volume Required To Fill Core Voids In Block

  • 6x8x16 2 core 0.17 CF/block

  • 8x8x16 2 core 0.25 CF/block

  • 10x8x16 2 core 0.33 CF/block

  • 12x8x16 2 core 0.39 CF/block

Approximate Quantities Of Concrete Required To Fill Bond Beams

  • 6x8x16 BBL 0.173 CF concrete per LF

  • 8x8x16 BBL 0.22 CF concrete per LF

  • 8x8x16 DEEP BBL 0.46 CF concrete per LF

  • 12x8x16 BBL 0.37 CF concrete per LF

  • 12x8x16 DEEP BBL 0.74 CF concrete per LF

 

Number Of Blocks Per Cube

Size

Arch PSF
No Per Cube

Arch PSMF
No Per Cube

Arch GF
No Per Cube

RedlineTM
UL LTWeight
No Per Cube
No Per Cube

21/4x4x16

270

---

---

---

4x4x16

240

240

288

300

4x8x16

120

120

144

150

6x4x16

100

100

120

120

8x8x16

75

75

90

90

12x8x16

50

50

60

60

 

Typical Concrete Masonry Unit Dimensions

Nominal

Actual Unit Size

Faceshell
Thickness( a)

Web
Thickness (a)

Inch-
Pound

Metric

Inch-
Pound

Metric

Inch-
Pound

Metric

Inch-
Pound

Metric

(in.)

(mm)

(in.)

(mm)

(in.)

(mm)

(in.)

(mm)

4x8x16

102x203x406

35/8x75/8x155/8

92x194x397

3/4

19

3/4

19

6x8x16

152x203x406

55/8x75/8x155/8

143x194x397

1

25

1

25

8x8x16

203x203x406

75/8x75/8x155/8

194x194x397

11/4

32

1

25

10x8x16

254x203x406

95/8x75/8x155/8

244x194x397

13/8

35

11/8

29

12x8x16

305x203x406

115/8x75/8x155/8

295x194x397

11/2

38

11/8

29

(a) Dimensions are minimum required by ASTM C 90 (a) (ref,3).

 

Designing Walls To Avoid Cutting Units On Jobs

Rule 1. A dimension in even number of feet (2 ft., 4 ft., 6 ft., etc.) will always work out in full-and half-block.
 

Rule 2. A dimension in an even number of feet plus 8 in. (2 ft. 8 in., 4 ft. 8 in., 6 ft. 8 in., etc.) will always work out in full-and half-block.

Rule 3. A dimension in an odd number of feet (1 ft., 3 ft., 5 ft., etc.). will not end in full-and half-block. But an odd number of feet plus 4 in. (1 ft. 4 in., 3 ft. 4 in., 5 ft. 4 in., etc.) will always work out in full-and half-block.

 

Examples of wrong and right planning of concrete masonry wall openings