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ASTM C90-11 b will allow cross web configurations to regulate by cross sectional section area
ASTM C90-11 b will allow cross web configurations to regulate by cross sectional section area
March 29, 2013 1:20 PM CDT

Changes to important codes

ASTM C90-11 b and NFPA 285

By

Recent changes to important codes include:

ASTM C90-11 b – Hollow Loadbearing Concrete Masonry Units

This will allow cross web configurations to regulate by cross sectional section area, not by web thickness.

Reasons for paying attention to this code change are as follows:

  • The change can increase R-values
  • Structural characteristic and performance will not be changed
  • In some cases, a reduction in cost may be achieved
  • Creates a smaller demand for sustainable materials to produce the units

NFPA 285 - Standard Test Method for Evaluation of Fire Propagation Characteristics of Exterior Non-Load Bearing Wall Assemblies Containing Combustible Components 2012 Edition

Language in the next building code will exempt the NFPA test when material flame indexes are met to published standards and airspaces that contain insulation are one inch (25 mm) or less.

The new language that was approved for inclusion in the next building code that exempts NFPA 285 testing:

Envelopes where rigid or spray applied insulation is encased by at least one inch (25 mm) of masonry, and there is no gap between the insulation and the masonry; or the insulation and the CMU are not separated by an airspace greater than one inch (25mm), and the insulation has an index for flame rate meeting requirements of ASTM E 84 or UL 723.


About the Author

Masonry, the official publication of the Mason Contractors Association of America, covers every aspect of the mason contractor profession - equipment and techniques, building codes and standards, business planning, promoting your business, legal issues and more. Read or subscribe to Masonry magazine at www.masonrymagazine.com.

 

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