Gypsemna’s Moisture Resistant & Firewall-Core Gypsum Plasterboards have the inherent properties of Firewall plasterboards and accrued Moisture Resistant plasterboards. This property is due to specific additives such as water repellents agents in the non-combustible, mechanically stable, and fire retarding gypsum core. This thus provides two combined advantages in a single board. The core of the board is encased in heavy duty Kraft paper liner on either side.