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I'm doing another EPDM roof soon. Been working with the material a lot lately and really like it. Normally we install over Isoboard and when we don't I'll re-sheathe a flat roof with OSB. I always put it smooth side up, figuring it was smoother and better for the adhesive to join to. Anyway, tommorow I'm sheathing a new addition and normally put the sheathing rough side up according to boards stamp. Here's my question: Do I bother the inspector by asking if I can install the OSB rough side down or is it a big deal to install the EPDM over the rough side. Any thoughts would be appreciated.
Sidenote-This is a tiny shed style back porch addition, nothing too fancy. The budget allowed for either modified rubber or EPDM but no Isoboard so they went with the EPDM.
Edited 9/8/2009 10:22 pm ET by ckorto