What type of gypsum is required for garage walls adjacent to habitable areas?

In residential construction, the fire resistance of materials is crucial, especially in areas where potential fire hazards exist, such as garages. The requirement for 5/8 inch Type X gypsum board in garage walls adjacent to habitable areas is established by building codes that aim to provide a fire rating that can help prevent the spread of fire from the garage to living spaces. Type X gypsum board has special additives and is denser than standard gypsum board, enhancing its fire resistance and allowing it to withstand exposure to flames longer than standard materials.

Garages can house vehicles, fuel, and other potential ignition sources, making it important to use materials that can help contain a fire to that area and protect adjacent living spaces. The use of 5/8 inch Type X gypsum is specifically mandated in these situations to ensure safety and compliance with fire-safety regulations.

Other options do not meet the necessary fire-resistance requirements for this application. Half-inch standard gypsum lacks the fire-resistant properties needed for such a critical fire barrier, and while 1/2 inch fire-resistant gypsum might seem adequate, it does not meet the thicker, more effective standards set by codes like the International Building Code (IBC) for this specific application. Using 3/8 inch regular gypsum is also