What kind of insulation is required for the walls in manufactured housing?

The requirement for R-11 insulation in the walls of manufactured housing is based on energy efficiency standards that ensure adequate thermal performance while keeping construction costs manageable. R-11 insulation is typically sufficient for walls because it provides a balance between insulation properties and the space available within the walls of a manufactured home. This level of insulation allows for effective thermal regulation, helping to maintain comfortable living conditions and reduce energy consumption.

In the context of manufactured housing, R-19 and R-30 insulation are designed for use in different applications, such as ceilings or floors, where greater insulation levels are needed to overcome greater heat loss or gain. Choosing R-11 for walls meets the necessary requirements while also accommodating the design and structural limitations often present in manufactured homes. The option indicating that "none is required" would not align with the building codes and regulations aimed at promoting energy efficiency in housing.