Barn roof snow: Do's and don'ts of removing it safely

Carol Spaeth-Bauer
Wisconsin State Farmer
A portion of a barn roof at the farm of Heather and Jay Jauquet, Pulaski, collapsed from the weight of snow dumped on the northern part of the state during Blizzard Evelyn on April 15, 2018.

This week's snowstorm didn't pack the punch of last year's spring storm Evelyn, but it still dumped a significant amount of snow across the state — and on barns and sheds. Hopefully buildings aren't creaking under the weight of too much snow yet, but when it comes to removing snow, using a systematic method will reduce the risk of injury or death to those working on the roof and barn occupants.

Cornell University provided some do's and don'ts of removing snow from barns after assessing the building's structural situation before getting on the roof to clear snow.

A wood structure that is creaking or moaning or if there is bowing of rafters, headers, or truss bottom chords may be signs of can be signs of a wood structure that is going to fail. Pre-engineered metal structures are more likely to fail without warning, according to Cornell University. 

Fourteen and 16-year-old sons of Heather and Jay Jauquet, of Pulaski, spent a couple of hours on April 15, 2018, shoveling snow off their transfer lane roof of their barn. The drift was about 12 high when they started.

What to do

Using a systematic, zone removal approach is the best way to remove roof snow from a barn. The number of zones depends on the width of the barn or the span of the trusses, starting with the area by the eaves and working up to the peak.

Snow should be removed from both sides equally, taking care not to pile the snow up against the barn walls, which could result in ventilation challenges or building failure. 

What not to do

Don't remove snow unequally from a barn roof or pile large piles of moved snow on the roof. 

Unbalanced loads, from one side of the roof to the other, can cause the unloaded side of the truss to lift. It's better to work back and forth from side to side or have a crew working simultaneously on each side. 

While clearing snow, don't create piles of moved snow on one spot of the roof. The roof might be able to support a load of snow if it is spread out equally across the roof, but piles of snow on the roof may cause failure in those areas. Cornell University recommends removing snow gradually working from the lower areas of the roof to the peak.