Several questions come to mind.
Where exactly are the tiles? I assume you are talking about the shower and/or tub area?
What are you planning to attach these sheets to?
How much of the old stuff are you taking down? Down to the studs?
Not an expert here, but my understanding is tiles don't fall because of poor ventilation. If there is moisture or water damage in the wall to the extent tiles are falling off, you want to be sure this is taken care of before covering the area or you may hiding mold and rot.