This Richmond American homeowner discovered that his toilet was not bolted down correctly when someone stepped in toilet water. Unfortunately, when the toilet and OSB were removed, he also discovered that the floor joists were too far apart. Attorney, Charles Pollock writes," The maximum joist spacing per code depends on the type of wood used and the amount of load on the floor (pounds per square inch).  However, the absolute largest span allowed under the code in any circumstances is 24”.  See R5032.3.1(1) of the 2000 IRC.  This is a constructional defect."

Incorrectly installed floor joists can cause things like sagging floors; in extreme cases, the bathtub or toilet may fall through the floor and land in your kitchen.