I have a stair that goes up 4'-0" and is monolithic. The problem I have is that the stair width changes from 4'-0" to 4'-6". The change occurs on the third 6th, 7th and 8th tread. Those treads need to be 4'-6" while the lower treads need to be 4'-0". Any help is appreciated. I've been trying to find someone who has run into the same problem, but maybe I'm using the wrong key words. Thanks.
Dean