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08-09-2009, 06:15 AM #10The IRC code I posted doesn't reference the 4"
I think it should, as it protects against water runoff and gas fumes
Fumes can be removed via ventilation in the garage.Joey R. Martin,aibd,cgp,cga,caps
Martin Design & Planning
Elwood, Indiana
Cell. 765-860-3567
eMail. joeymdp@gmail.com