Personally I have always hated the 2 foot span. I am an older fart that use to build 16 on center even with trusses or at the very very least used 5/8 on the roof or walkways in attics.

I can't tell you how many times I stepped on 7/16 in an attic and scruuuuunch, crack. For storage I do not know the code I will have to look it up as well

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Ted Menelly
"Castle"
Home Inspection Services