Don, where exactly are you building? Also, h/900 is a very strict limit and I assume you are refering to story drift. AISC (the American Institute for Steel Construction) recommends h/400 for story drift in steel framed buildings. Story drift limits more strict than this are usually based on glazing system criteria not found in the typical residence. h/900 is equivalent to 1/8 of an inch drift on a 10' tall story.