What is the k value of drywall?

The k value, or thermal conductivity, of drywall typically ranges from about 0.2 to 0.3 W/m·K (watts per meter per Kelvin). This value can vary slightly based on the specific type of drywall and its composition, including factors like moisture content and additives. Drywall is generally considered a good insulator, contributing to its use in building construction for energy efficiency.