Since 1924

 
 

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

 

 

 



 
 
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