I am new to this and think I blew it when I wrote earlier!!
I have a contract to install three apartments over 3 businesses in a commercial building. I built the original a few years back and it was designed with the apartments in mind. The problem that I have is that the owner wants a floating floor now to keep the sound from the businesses. The apartments have the stairways installed for fire and access. I used 1″ dense foam between two sheets of plywood previously in a home and it worked great (It was part of the design) but to install the foam and plywood is going to cause problems with the top riser on the stairs. The inspector does not want any change in the rise. My answer so far has been that we have to do the stairways over—which will disturb the lower businesses. Any ideas?????