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MD: Bladensburg (HQ)

(301) 927-8300

4700 Annapolis Road, Bladensburg, MD 20710, USA

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CMU Fire Rating Chart

Ted Kelly | September 3, 2015

Ernest Maier CMU Complying with IBC 2003

Equivalent Thickness Table 6.0 – Tek Note 7.01D

2005 Supplement

Fire Resistance Nominal Size ASTM Solid Materials Equivalent Thickness (in)
½ Hour 2x8x16

3x8x16*

C-145

C-90

100%

79%

1.9

1.9

¾ Hour 4x8x16

3x8x16

C-90

C-145

65%

100%

2.4

2.6

1 Hour 4x8x16

4x8x12

4x8x16*

C-90

C-90

C-145

79%

73%

78%

2.7

2.7

2.8

1 ½ Hours 6x8x16

8x8x16 Normal Weight

C-90

C-90

54%

50%

3.0

3.8

2 Hours 2-1/4×3-3/4×8**

4x8x16

4x8x12

8x8x24***

6x8x16***

8x8x16 Lightweight***

C-55

C-145

C-145

C-90

C-90

C-90

100%

100%

100%

52%

64%

50%

3.6

3.6

3.6

3.7

3.6

3.8

3 Hours 8x8x16

10x8x16

C-90

C-90

63%

50%

4.8

4.8

4 Hours 8x8x16

8x8x12

12x8x12***

12x8x16

6x8x16

8x8x12

8x8x16

C-145

C-145

C-90

C-90

C-145

C-145

C-145

75%

75%

55%

50%

100%

100%

100%

5.7

5.7

5.4

5.6

5.6

7.6

7.6

CMU Fire Resistance Calculator

* BMS 92 – National Bureau Standard

** Concrete Brick

Primary Aggregates – Expanded Shale and/or Pumice

Above Blocks Plastered on One Side with 1/2 inch 1:3 Gypsum and Sand Plaster adds 1/2 Hour to Fire Rating

VP of MasonryTed Kelly

Phone
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MD: Bladensburg (HQ)
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