/diy/ - Do It Yourself

So I made a thread the other day about wanting to tile my fucked up modile home bathroom with a picture of my walls. Ever one told me to burn it with fire and not to put tile on until I replace the possibly water damaged walls.

I have now removed my walls were I want to put tile. The insulation has some black stuff around the window but doesn’t seem to be mold from the kit I bought. Could be left over crap from the home being infested with bugs from previous owners.

I’m now worried if I install the cement board it will get water damage from possible leaking around the window above shower. I have to redgaurd the side of the board faceing the shower anyways, so ...

My question: is it dumb to redgaurd the entire board to avoid any possible water damage from the stud side? I’ll post a pic of the cement board I got.