Correct!    True.  The wording of section 210.63 has been changed by deleting the words, “on rooftops and in attics and crawl spaces”.  The requirement is now all-inclusive.  The exception for rooftops of dwelling units has also been removed.

Metric designator:

16 = 1/2"
21 = 3/4"
27 = 1"
35 = 1 1/4"
41 = 1 1/2"
53 = 2"

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