Re: Bathroom floor leak
The first question is where is all the water coming from?
If you've got enough water coming through to the ceiling, then it's a heck of a lot more than surface moisture from a shower or general use of the bathroom. My suspicion is a drain leak, either from the toilet or accompanying shower or vanity.
To answer your question, no, there is nothing you can put in the ceiling cavity to absorb the moisture or stop the water intrusion to the kitchen. Finding the source of the problem will be the only remedy.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!