What is the relationship between rafter spans and ground snow load?

The relationship between rafter spans and ground snow load is rooted in structural engineering principles. When a building is subjected to higher loads, such as increased ground snow loads, the design requirements for the rafters must adjust accordingly to ensure safety and structural integrity.

Increased ground snow load necessitates shorter rafter spans because longer spans would require the rafters to carry more weight and stress. This is based on the understanding that greater loads lead to more deflection and potential failure if the rafters are not adequately supported. Therefore, as the ground snow load increases, the span of the rafters typically needs to be reduced to accommodate these higher forces, ensuring that the structural system is reliable and resilient.

This relationship is essential in residential building design, as it affects decisions about material selection, rafter sizing, and overall structural planning. Thus, understanding how load influences rafter spans is crucial for compliance with building codes and safety standards.