According to IRC, what is the minimum nominal thickness of support required for gypsum board installed in wood framing?

The minimum nominal thickness of support required for gypsum board installed in wood framing, according to the International Residential Code (IRC), is indeed 2 inches. This specification is essential because proper support is crucial for ensuring the structural integrity and stability of the gypsum board. This thickness provides the necessary strength and durability to withstand the weight of the gypsum board and any additional loads it may encounter, such as screws or fasteners and the occasional moisture exposure.

The IRC outlines that appropriate support becomes even more critical in scenarios where the gypsum board might be subjected to impact or where seismic and wind loads come into play. Adhering to these regulations helps prevent issues such as sagging, cracking, or detachment of the gypsum board over time, ensuring a safer and more reliable construction. Understanding this aspect of building practices aids in maintaining compliance with building codes, promoting both safety and longevity in construction projects.