A specific type of live load calculation representing the maximum weight of snow that a roof structure is expected to support. Engineers determine this value based on local climate data, roof pitch, and material, ensuring the trusses and load-bearing walls will not collapse under heavy winter weather.
The inspector flagged the plans because the rafter spans don't meet the 40 PSF snow load requirement for this elevation.
Related terms
Live load
The temporary or moving weight that a structure must be designed to support.
Dead load
The permanent, stationary weight of a building's structural elements and fixed equipment.
Design load
The maximum combination of forces a structure is engineered to safely support.
Snow guard
A roof-mounted device that prevents accumulated snow from sliding off in large sheets.