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AVERAGE WEIGHT(*) OF CONCRETE MASONRY UNITS, POUNDS PER UNIT

Unit 16" Lond

Thickness of Units

Light Weight Unit:
103 pcf
Medium Weight Unit:
115 pcf
Normal Weight Unit:
135 pcf
4" 6" 8" 10" 12"
4" 6" 8" 10" 12"
4" 6" 8" 10" 12"
Individual 4" high units
Block 8" high
units
8 11 13 15 20
16 23 27 32 42
9 13 15 17 22
18 28 32 36 47
10 16 18 20 22
21 33 37 42 55

(*) ASTM C90 classified masonry units as follows: Lightweight: Less than 105 pcf. Medium weight 105 pcf to less than 125 pcf.
Normal weight: 125 pcf. or more.

AVERAGE WEIGHT OF COMPLETED WALL(1), POUNDS PER SQUARE FOOT
AND EQUIVALENT SOLID THICKNESS, INCHES, Weight of grout 140 pcf

Wall Thickness Hollow Concrete Block Equlvalent
Solid Thickness(2) Inches
Light Weight
103 pcf
Medium Weight 115 pcf Normal Weight
135 pcf
6" 8" 10" 12"
6" 8" 10" 12"
6" 8" 10" 12"
6" 8" 10" 12"
Solid grouted wall
52 75 93 118
58 78 98 124
63 84 104 133
5.6 7.6 9.6 11.6
Vertical 16" o.c.
cores 24 " o.c
grouted 32" o.c.
at 40" o.c.
 

48" o.c.

41 60 69 88
37 55 61 79
36 52 57 74
35 50 55 71
34 49 53 69
47 63 80 94
43 58 72 85
42 55 68 80
41 53 66 77
40 52 64 75
52 66 86 103
48 61 78 94
47 58 74 89
46 56 72 86
45 55 70 83
4.5 5.8 7.2 8.5
4.1 5.2 6.3 7.5
4.0 4.9 5.9 7.0
3.8 4.7 5.7 6.7
3.7 4.6 5.5 6.5
Ungrouted
26 33 36 47
32 36 41 53
37 42 47 62
3.4 4.0 4.7 5.5

1. The above table gives the average weights of completed walls of various thickness in pounds per square foot of wall face area.
An average amount has been added into these values to include the weight of bond beams and reinforcing steel.

2. Equvalent solid thickness means the calculated thickness of the wall if there were not hollow cores, and is obtained by dividing the volume of solid material in the wall by the facearea of the wall.

This Equivalent Solid Thickness (EST) is for the determination of area for structural design only, e.g. fa =P/(EST)b. It is NOT to use to obtain fire ratings. Fire rating thickness is based either on equivalent solid thickness of ungrouted units only or solid grouted walls.

 

 
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