Slump Blocks

In contrast to the precise dimensions of the straight-edged precision block, slump blocks are intentionally distorted during the manufacturing process to simulate the appearance of old adobe bricks. The rustic, rounded appearance of slump block is produced by utilizing a wetter than normal mixture that is subjected to an additional compression immediately upon ejection from the mold.

When specifying concrete masonry units, the dimensions are indicated in the following manner: width x height x length. Dimensions of slump blocks are usually expressed in terms of their nominal size, which is one-half an inch greater than their actual size. This half-inch difference accommodates the standard 1/2 inch mortar joint that is utilized with precision units. For example, a unit with the nominal dimensions of 8″ x 6″ x 16″ would have actual dimensions of 7-1/2″ x 5-1/2″ x 15-1/2″.

Slump wall and planter
Slump block wall
Chular slump wall
Slump block posts
Slump block wall
Slump block wall and arch feature

Applicable Standards

The slump block manufactured by Air Vol Block, Inc. comply with the requirements of ASTM C-90 and section 21-4 of the Uniform Building Code. For more information regarding the ASTM standards pertaining to concrete masonry units, please call our office.

Quality Assurance

Air Vol Block has on-site testing facilities in which we can test our products to ensure that they comply with the necessary specifications. Additionally, we participate in a testing program in which an independent laboratory randomly samples and tests our concrete masonry units on a quarterly basis.

Available Colors

Air Vol Block stocks a wide variety of slump block sizes in natural Gray and our tan slump color. Adobe colored slump units are now considered to be a “special-order” item. Please give us advance notice of projects requiring the adobe color. A wide variety of other custom colors may also be special ordered. Please contact your Air Vol Block representative for more information regarding custom colors.

The raw materials utilized in the manufacture of concrete masonry units are subject to natural variations in color which affect the color of the finished product. It is important that our customers understand that color can be guaranteed only to a range of color. Even natural Gray units, which are manufactured without pigments, may have noticeable shade variations from run to run.

Available Sizes

Slump blocks are readily available in 4″ and 6″ heights. Available widths include 4″, 6″, 8″, 12″, and 16″. Open-end units can be special ordered.

Note: Many slump units can be special-ordered as open-end units. Please contact our Sales Department for more information.

Air Vol Block is constantly adding new sizes and shapes to its product line. Please contact our sales office about sizes and shapes not shown.

Common Shapes and Sizes

Slump Block: 4″ Wide

4″ High

4x4x8 Half
4x4x8 Half
4x4x8 Half
4x4x8 Half
4x4x16 Standard
4x4x16 Standard

6″ High

4x6x16 Standard
4x6x16 Standard

Slump Block 6″ Wide

4″ High

6x4x14 Corner
6x4x14 Corner
6x4x16 Bond Beam
6x4x16 Bond Beam
6x4x8 Half
6x4x8 Half
6x4x16 Standard
6x4x16 Standard

6″ High

6x6x14 Corner
6x6x14 Corner
6x6x16 Bond Beam
6x6x16 Bond Beam
6x6x8 Half
6x6x8 Half
6x6x16 Standard
6x6x16 Standard

Slump Block 8″ Wide

4″ High

8x4x16 Bond Beam
8x4x16 Bond Beam
8x4x8 Half
8x4x8 Half
8x4x16 Standard
8x4x16 Standard

6″ High

8x6x16 Bond Beam
8x6x16 Bond Beam
8x6x8 Half
8x6x8 Half
8x6x16 Standard
8x6x16 Standard

Slump Block 12″ Wide

4″ High

12x4x16 Bond Beam
12x4x16 Bond Beam
12x4x8 Half
12x4x8 Half
12x4x16 Standard
12x4x16 Standard

6″ High

12x6x16 Bond Beam
12x6x16 Bond Beam
12x6x8 Half
12x6x8 Half
12x6x16 Standard
12x6x16 Standard

Slump Block Accessory Units

Ring Pilasters

12x4x12
12x4x12
12x6x12
12x6x12
16x4x16
16x4x16
16x6x16
16x6x16

Caps

6x2x16
6x2x16
8x2x16
8x2x16
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REQUEST A QUOTE

Our staff of masonry and landscape experts is standing by to assist you with any questions you may have or just send us your material quantities to get an itemized material quote.

Air Vol Block

(805) 543-1314

1 Suburban Road
San Luis Obispo, CA 93401


Business Hours

M-F 7:00 AM to 5:00 PM
Sat: 9:00 AM to 1:30 PM