varitions in foor and ceiling height. because of variations in setteling, origional materials installed, ect.., you may need to use some temporary supports and do some jacking and leveling as part of the process. watch for nail pops and damage to other parts of the house as you go. examine point loads/bearing points before any demolition. i`d consider going back w/treated in problem area. you should remember that it gives off toxic gases during a fire and if it gets wet in a wall, it can bleed through and permantley stain drywall. i might also look into a drip pan made for the washing machine. wear proper safety clothing/respirator against molds, and kill any that have grown. if you run across any black molds, please call an expert. i can`t think of much more and sounds like you`re thinking this thing out right before you start. good luck.