Lumen Energy, Inc.

Trivan says most lightweight industrial roofs carry only about two to three pounds per square foot of spare structural capacity for added equipment.

Lumen Energy, a solar company, points out that building codes in most places already require roofs to carry 15 to 40 pounds per square foot or more of snow and concludes that most commercial buildings have plenty.

Be careful with that argument.

That snow capacity is there to carry snow.