Are There Any Special Regulations For Solar Installations In Snow Country?

Snow Load Requirements

In regions with high snowfall, solar panels are subject to additional stress caused by accumulated snow. The International Building Code (IBC) and the National Electric Code (NEC) provide guidelines for snow load calculations. For example, the IBC recommends a minimum snow load of 20 pounds per square foot (psf) for flat roofs in Zone 4, which can translate to around 2,400 pounds per panel for a standard 120-square-inch panel, assuming a typical 8:12 roof pitch. This calculation may vary depending on local building codes and panel orientation.

Structural Integrity and Attachment

To ensure structural integrity, solar panel arrays in snow country must be properly attached to the roof or a freestanding structure. This is typically achieved through a combination of ballasted and mechanically attached systems. For example, a 5-kW solar array with 20 panels may require 10-15 pounds of ballast per square foot to ensure stability. In areas with high snowfall, it’s essential to use reinforced attachment systems, such as those with a minimum of 3,000 pounds of tensile strength.

Specialized Panel Designs and Clearances

In areas with heavy snowfall, specialized solar panel designs can enhance performance and safety. These may include panels with a lower profile, increased clearance between panels, or specialized snow shedding systems. For example, a panel with a 6-inch clearance between the back of the panel and the roof surface can help prevent snow accumulation and reduce the risk of damage. Additionally, using a snow shedding system can reduce the weight of accumulated snow by up to 50%.