How thick should the gypsum board be applied on the garage side to separate it from the residence?

The requirement for the thickness of gypsum board used to separate a garage from a residence is primarily to help prevent the spread of fire from the garage to the living areas of the home. The recommended thickness for this application is 5/8 inch, as it provides a sufficient level of fire resistance.

Gypsum board at this thickness offers increased durability and resistance to fire compared to thinner options. In residential construction, building codes often specify 5/8 inch Type X gypsum board for walls shared between a garage and living areas to ensure enhanced fire protection. Type X gypsum board has additives that improve its fire-resistant properties, making it suitable for this critical safety feature.

Thinner boards, such as 1/2 inch, do not have the same level of fire resistance and do not meet code requirements for this application. Likewise, options like 1 inch or 1.25 inches are excessive and not typically necessary for residential applications. Using the correct thickness ensures compliance with safety codes and contributes to overall fire safety in the home.