Expert: Bruce E. Johnson - 3/22/2009

Question
Having a remodel project done in my 2nd floor (bedrooms and bath) and as an additional part to the project, the contractor is reworking the stairs to the attic, which is currently unfinished and is not part of thie project or my building permit.  Do the stair rise and tread depth have to conform to the residential code of 10" depth (not including nose) and max rise of 7-3/4"?  Since they lead to an unfinished attic, I thought there might be different specifications.  Thanks.

Answer
Hi Alan, attic stairs or stairs going to certain storage places can be different, i.e. steeper pitched with smaller treads.  How different depends on you local codes.  But because of the rise and sometimes cramped run locations for these kinds of access stairways it is necessary for these to be more like a ladder than a conventional staircase.  Which leads me to believe you can go up to a foot rise and as little as an eight inch tread if you have an open riser.  Have your builder check the local code under attic access requirements.  I hope this information helps feel free to write again regarding this or other matters, sincerely bruce e johnson..bejohnsonconsulting.com