November 27, 2001
To: All Design & Specification Professionals
From: Paul LaVene, President, CCMA RE: Specification Revision

Dear Design Professional:

The intent of this notice is to inform designers and specification writers of a Masonry Industry Revision relative to Type I and Type II Concrete Masonry Units (CMU).  

The reference to Classification Type I and Type II Units has been eliminated in the latest revision of ASTM C 90-01.  You can view this latest revision by click on News You Can Use page.  The previous edition of ASTM C 90-99a is referenced in the CCMA Yellow Concrete Masonry Manual and should be deleted.  Please make reference to the New ASTM C 90-01 for any new projects.

This endorsement will improve the performance of the masonry wall system by providing control joints in proper locations, thereby minimizing restraint.  The wall will then be allowed to react to chemical, thermal and physical change with a reduced likelihood that cracks may develop. view wall movement

PLEASE MAKE THIS INDUSTRY CHANGE IN YOUR MASTER SPECIFICATIONS SECTION 04200.

Thank you for your support in designing with Concrete Masonry Units.