1/2" Greenboard in place of 1/2" sheetrock

[mtCDCcb]

I am remodeling my home and my drywallers ran out of standard 1/2" sheetrock. The used 1/2" green board in a couple places in place of the standard sheetrock. It was installed in non wet areas such as a stairway and a wall section in the living room. Is this allowed by the 2009 IRC? Everything I have read makes me think that it is as long as it is not in wet areas or where type x gypsum board is required.

[Jerry Peck - Codeman]

As long as it was not used on the ceiling (there are different framing requirements for green board when installed on the ceiling) about the only difference you may see may be in the finished wall as the paint may show differently on the different paper of the green board.

Green board is not suitable for use where Type X is required, but I doubt there were any areas which required Type X in the stairway or the living room.