Yes, moulded doors can be used in humid environments like bathrooms. These doors are generally durable and resistant to warping. Some of the factors that you should consider when you are using moulded doors for the bathroom are: first, check what are moulded doors made of. Make sure the doors have a water-resistant coating or moisture-resistant MDF. Take preventive measures to ensure their longevity in humid conditions, such as proper ventilation to control humidity levels.