Document Archives

Estimating Fire Resistance of Concrete Masonry Walls

• ID:

  90

• ESCSI:

  3220.049

• Author:

  Callahan, Kevin and Henry Toenessies

• Publication Name:

  Estimating Fire Resistance of Concrete Masonry Walls

• Type of Publication:

  Article

• Publisher:

  National Concrete Masonry Association

• Dated:

  1964

• Issue/Volume:

  September 2

• Other ID:

  NCMA 11-62

• Page(s):

  1-5 + tab, fig.

• Reference List:

  N

• Abstract:

  It is the objective here to review the functional relationship between equivalent thickness (T) and the fire endurance (F) of concrete masonry panels tested in accordance with ASTM E 119. A review is warranted because of recent activities by other organizations, activities which suggest the equivalent thicknesses listed in the National Board of Fire Underwriters (NBFU) publication “Fire Resistance Ratings of Walls and Partitions,” April, 1959, page 54, are no longer valid. A draft prepared by the Associate Committee on the National Building Code, NRC, Canada, “Fire Endurance of Masonry Walls” lists equivalent thicknesses for 1, 2, 3 and 4 hours that are more conservative than the NBFU values. NCMA comments were requested on the draft by our affiliate NCPA. A draft prepared by a Fire-Resistive Subcommittee of the International Conference of Building Officials (ICBO) gives equivalent thicknesses less conservative than the NBFU. NCMA is shown as a member of the ICBO Subcommittee.