Technical Specifications

All concrete masonry units shall comply with ASTM C90-02, as manufactured by Kansas Building Products, Co., Wichita, Kansas.

If you want “Lightweight Blocks” (in this locality commonly known as “Haydite Blocks”), specify that the aggregate shall meet ASTM C331. If you want “Normal Weight” blocks (in this locality commonly known as “Concrete Blocks”), specify that the aggregate shall meet ASTM C33.

Note: Split Face and Colored Blocks shall be manufactured with an integral water repellant, and the mortar used with them shall contain a water repellant.

When using Split Face and/or Colored Block, blocks from two or more cubes shall be mixed as they are being laid to ensure color and/or face variations will be divided.

For additional technical information, visit the Tech Bulletins offered by the National Concrete Masonry Association (NCMA), or contact our sales staff for assistance.

Technical Specifications

All concrete masonry units shall comply with ASTM C90-02, as manufactured by Kansas Building Products, Co., Wichita, Kansas.

If you want “Lightweight Blocks” (in this locality commonly known as “Haydite Blocks”), specify that the aggregate shall meet ASTM C331. If you want “Normal Weight” blocks (in this locality commonly known as “Concrete Blocks”), specify that the aggregate shall meet ASTM C33.

Note: Split Face and Colored Blocks shall be manufactured with an integral water repellant, and the mortar used with them shall contain a water repellant.

When using Split Face and/or Colored Block, blocks from two or more cubes shall be mixed as they are being laid to ensure color and/or face variations will be divided.

For additional technical information, visit the Tech Bulletins offered by the National Concrete Masonry Association (NCMA), or contact our sales staff for assistance.

Veneer
Wall Thickness Lbs. Per Sq. Ft. Fire Rating Sound Class R Value
4″ 4″ Split Block
Normal Weight
32 1 41 1.72
4″ 4″
Slump Block
32 1 41 1.72
4″ Clay Brick 40 1 45 0.44
Clay Brick & Block
Wall Thickness Lbs. Per Sq. Ft. Fire Rating Sound Class R Value
8" Clay Brick & 4" Lt. Wt. Blk. Back-Up 61 4 50+ 3.73
10" Clay Brick & 6" Lt. Wt. Blk. Back-Up 65 4 50+ 3.92
12" Clay Brick & 8" Lt. Wt. Blk. Back-Up 72 4 50+ 4.15
VARIES Clay Brick & 8" Lt. Wt. Blk. Back-Up with 3/4 to 4" cavity 73 4 50+ 5.12
Block & Block
Wall
Thickness
Lbs.
Per Sq. Ft.
Fire
Rating
Sound
Class
R
Value
10″ 4″ Split Block
Normal Wt. & 6″ Lt. Wt. Blk. Back-Up
59 4 50+ 3.45
12″ 4″ Split Block
Hvy. Wt. & 8″ Lt. Wt. Blk. Back-Up
64 4 50+ 3.7
10″ 4″ Split Block
Normal Wt. & 6″ Lt. Wt. Blk. Back-Up
59 4 50+ 3.45
12″ 4″ Split Block
Normal Wt. & 8″ Lt. Wt. Blk. Back-Up
64 4 50+ 3.7
Back-Up
Wall Thickness Lbs. Per Sq. Ft. Fire Rating Sound Class R Value
4″ 4″ Lt. Wt.
Block
21 1 40 2.44
6″ 6″ Lt. Wt.
Block
25 1* 44 2.63
8″ 8″ Lt. Wt.
Block
32 2* 45 2.86
10″ 10″ Lt. Wt.
Block
39 4 45+ 3.13
12″ 12″ Lt. Wt.
Block
43 1 50 3.33
Partition
Wall Thickness Lbs. Per Sq. Ft. Fire Rating Sound Class R Value
4″ 4″ Lt. Wt.
Block
21 1 40 2.44
6″ 6″ Lt. Wt.
Block
25 1* 44 2.63
8″ 8″ Lt. Wt.
Block
32 2* 45 2.86
Miscellaneous
Wall Thickness Lbs. Per Sq. Ft. Fire Rating Sound Class R Value
8″ 8″ Split Flute Normal Wt. 47 2 52 2.1
8″ 8″ Slump Block 45 2 49 2.7
Veneer
Wall Thickness Lbs. Per Sq. Ft. Fire Rating Sound Class R Value
4″ 4″ Split Block
Normal Weight
32 1 41 1.72
4″ 4″
Slump Block
32 1 41 1.72
4″ Clay Brick 40 1 45 0.44
Clay Brick & Block
Wall
Thickness
Lbs.
Per Sq. Ft.
Fire
Rating
Sound
Class
R
Value
8″ Clay Brick &
4″ Lt. Wt. Blk. Back-Up
61 4 50+ 3.73
10″ Clay Brick &
6″ Lt. Wt. Blk. Back-Up
65 4 50+ 3.92
12″ Clay Brick &
8″ Lt. Wt. Blk. Back-Up
72 4 50+ 4.15
VARIES Clay Brick &
8″ Lt. Wt. Blk. Back-Up with 3/4 to 4″
cavity
73 4 50+ 5.12
Block & Block
Wall
Thickness
Lbs.
Per Sq. Ft.
Fire
Rating
Sound
Class
R
Value
10″ 4″ Split Block
Normal Wt. & 6″ Lt. Wt. Blk. Back-Up
59 4 50+ 3.45
12″ 4″ Split Block
Hvy. Wt. & 8″ Lt. Wt. Blk. Back-Up
64 4 50+ 3.7
10″ 4″ Split Block
Normal Wt. & 6″ Lt. Wt. Blk. Back-Up
59 4 50+ 3.45
12″ 4″ Split Block
Normal Wt. & 8″ Lt. Wt. Blk. Back-Up
64 4 50+ 3.7
Back-Up
Wall Thickness Lbs. Per Sq. Ft. Fire Rating Sound Class R Value
4″ 4″ Lt. Wt.
Block
21 1 40 2.44
6″ 6″ Lt. Wt.
Block
25 1* 44 2.63
8″ 8″ Lt. Wt.
Block
32 2* 45 2.86
10″ 10″ Lt. Wt.
Block
39 4 45+ 3.13
12″ 12″ Lt. Wt.
Block
43 1 50 3.33
Partition
Wall Thickness Lbs. Per Sq. Ft. Fire Rating Sound Class R Value
4″ 4″ Lt. Wt.
Block
21 1 40 2.44
6″ 6″ Lt. Wt.
Block
25 1* 44 2.63
8″ 8″ Lt. Wt.
Block
32 2* 45 2.86
Misc.
Wall Thickness Lbs. Per Sq. Ft. Fire Rating Sound Class R Value
8″ 8″ Split Flute Normal Wt. 47 2 52 2.1
8″ 8″ Slump Block 45 2 49 2.7