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technical information. If the charts do not answer your
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Concrete Masonry Association (NCMA) giving you access
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FIRE RESISTANCE TABLES
Fire resistance of concrete masonry
walls is a function of aggregate type and equivalent
thickness of the masonry units.
The following ratings are figured
using the actual percent of solids in the various sizes
of blocks as manufactured by Capitol Concrete Products
Co. Inc., Topeka, Kansas.
The ratings are based on test information
obtained from Underwriters' Labratories inc., National
Bureau of Standards, Portland Cement Association, and
Uniform Building Code.
| |
|
|
FIRE RESISTANCE
IN HOURS |
| AS MANUFACTURED BY CAPITOL CONCRETE |
PER- CENT SOLID |
EQUIVALENT THICKNESS |
LIGHT- WEIGHT EXP. SHALE |
NORMAL- WEIGHT LIMESTONE |
| BRICK |
100.0 |
3.63 |
2.0 |
1.0 |
| 4" STANDARD CORES |
73.4 |
2.66 |
1.0 |
1.0 |
| 4" SOLID |
100.0 |
3.63 |
2.0 |
1.0 |
| 6" STANDARD CORES |
54.5 |
3.07 |
1.0 |
1.0 |
| 6" SPECIAL 2-HOUR CORES |
70.0 |
3.93 |
2.0 |
1.0 |
| 6" SOLID |
100.0 |
5.63 |
4.0 |
3.0 |
| 8" STANDARD CORES |
53.0 |
4.04 |
2.0 |
2.0 |
| 8" SPECIAL 4-HOUR CORES |
75.0 |
5.72 |
4.0 |
3.0 |
| 8" SOLID |
100.0 |
7.63 |
7.0 |
6.0 |
| 12" STANDARD CORES |
48.7 |
6.66 |
4.0 |
3.0 |
| 12" SPECIAL 3 CORE |
55.9 |
6.80 |
4.0 |
4.0 |
for additional information see:
Concrete Masonry Manual published by Expanded Shale,
Clay and Slate Institute. section 9 - "Fire Resistance"
pages 27, 28 and 29
concrete masonry handbook published
by portland cement association "fire resistance
of concrete masonry" pages 12 and 13
Tek 35c "Fire Safety with Concrete
Masonry" published by National Concrete Masonry
Association
Uniform Building Code - section 4302(a)
- table 43-b, 1985 edition and 1986 supplement |
