I discovered green board on tiled shower wall...
We did a kitchen addition a couple years ago, before I discovered GW. I was flipping through my construction pictures looking for one to help answer someone else's question on GW this morning, and noticed, in a picture I took of our pantry, you can clearly see that the bathroom wall (other side of pantry--was remodeled at some time prior to our owning the house) is green board, and not a hardibacker.
This used to be an exterior wall (until we added our addition). And, the insulation they put in was a plastic wrapped insulation (I'll post the picture below). The bathroom side of that green board is 12x12 tiles with a shower/tub combo. The first 6 yrs of owning the house, we rarely used that shower (only the tub). We have started to use the shower more.
Now my question--not knowing if they put hardi over the green board, and assuming they did not, how long until I need to replace that whole wall/tile installation? What can I do to "protect" it in the mean time?
Here is the picture: