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Joist Tag Designations

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I have to check a joist built in 1961 to see if it can support some
additional loading.  The joist tag said "18J72109J-13."  I know what the
18J7 means, can anybody enlighten me as to what the other numbers mean?
Or possible direct me where to look?  Thanks.

Zachary Goswick
Angus-Young Associates, Inc.
555 South River Street
Janesville, WI  53545-4827
Phone: (608)756-2326 
Fax: (608)756-0464