Handy Reference
These Charts are designed to help
you quickly and conveniently reference technical information.
If the charts do not answer your specific questions,
please make use of the National
Concrete Masonry Association (NCMA) giving you access
to all of NCMAs Tech bulletins. Contact
us if you cannot find the technical information
you need.
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 and 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 and 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 |
* see
Fire
Resistence Table
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 |
* see
Fire
Resistence Table
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 |
