Waterproof gypsum board isn't a standard product. However, there are options for making gypsum board (drywall) more resistant to moisture:
1. *Moisture-resistant gypsum board*: Some boards have additives or treatments for better moisture resistance.
2. *Green boards or cement boards*: Used in wet areas like bathrooms for more durability against moisture.
For full waterproofing in wet areas like showers, products like cement boards (e.g., HardieBacker) are often used instead of standard gypsum board.
Do you have a specific project or application involving gypsum board and moisture resistance?