I own a brick two-story building built in 1899, with a commercial space on the first floor and what I hope to be an apartment on the second floor. The building is very original. Noise from anyone on the second level can easily be heard on the first level. The commercial space's ceiling is beadboard (wainscoting), nailed to floor joists, with the original inexpensive wood on the second floor. The state SHPO would okay a sound barrier, provided it is less than one inch high. If all goes according to plan, the second floor will have people walking around, with a full kitchen and washer/dryer. I would hate to drive out my first-floor tenant with the potential noise. I would appreciate anyone's suggestions. Thanks.