@johnthemoldguy: I’ve talked about this many times, tile and grout showers were built very poorly for a long period of time they were made with paper faced gypsum, a.k.a. Mold food behind. These can become significant sources of mold and are often overlooked. While moisture readings and showers is very common it’s important to understand the substrate so you can make a determination whether or not there’s likely to be Mold. #mold #tileshower #gypsum #bathroommakeover #moldtesting