What is the minimum design load for uninhabitable attics?

The minimum design load for uninhabitable attics is specified as 20 pounds per square foot (psf) to ensure adequate structural support for the weight of stored materials, insulation, and any potential maintenance work that may occur in these spaces. This load is established in building codes to provide a safety buffer against potential stresses on the attic structure, which may include the weight of snow accumulation or other loads that could temporarily burden the attic space.

Choosing 20 psf corresponds with standard regulatory requirements that prioritize safety standards for uninhabited spaces, striking a balance between structural integrity and economic design. Understanding the different design loads for various building components is critical for inspectors, as it aids in verifying compliance with building codes and ensuring the safety of residential structures.