How do I prevent mold in the shower?

Prevent shower mold with three measures: vent exhaust fans to the exterior (never to the attic), run the fan for 60 minutes after every shower (timer switches automate this), and quality grout & silicone at all joints. A growing trend has been minimizing grout lines with larger-format tile. Heated floors that include the shower floor offer tremendous benefits in aiding the drying process, with some showers now being equipped with air drying systems to air-dry the shower in minutes. Moisture in a bathroom is inevitable; damage from moisture is preventable.