I just took out the gyproc around the bathtub...all sides. There had been leaking through the old tiles...house is 46 yrs old, but only the past year since I bought it and we take showers. The previous owners were elderly and took baths. Anyway, I have it all cleaned out and dried out...no rot, just some darkness where the mildew had started, but that's cleaned up too. I have pink insulation replacing the blown-in stuff that had to be removed/fell out when the gyproc came off. I have water-proof gyproc to go back in before I put the white acrylic surround on. Here is the question.....Should I put vapour barrier between the insulation and the gyproc? There was none before and if it hadn't leaked through the tile it would have been fine. I will be caulking of course, with silicone. If I do need vapour barrier
could I improvise and (don't laugh) use the white foam underlay I used when I put laminate flooring down? I have much left over and it seems like it would be ok. Opinions?