Collapsed Breckenridge building likely didn’t meet modern snow-loading standards
January 12, 2017
The roof of the Ten Mile Room in Breckenridge collapsed under the weight of historic snowfall on Wednesday night, prompting the evacuation of roughly 70 units in the adjacent Peak 9 Inn and Chateaux Condominiums. The large conference building was unoccupied at the time, and no injuries were reported.
The Ten Mile was part of the Village at Breckenridge, a resort complex near Lot F. Buildings there were without gas throughout the day Thursday, as Xcel Energy had turned it off while crews worked to bring down a remaining wall that was hanging over gas risers.
A Vail Resorts spokeswoman said in an email that the building regularly hosts groups year round, although she couldn't immediately confirm when the last event was, nor whether people had been inside during the day of the collapse.
She said that staff were working to find alternative venues for groups that had already made plans to use the space.
Officials said the collapse, easily the biggest in recent memory, was caused by a combination of nearly 49 inches of snow in a week and warm temperatures that made it wetter and heavier.
"A lot of factors are making it worse," said Red, White & Blue Fire Protection District Chief Jim Keating. "The other day it was nearly 40 degrees, melting snow, then the temperature drops back down to 15 degrees and freezes. It really solidified and then there was more snow on top."
Given its old age and large, flat roof that covered nearly 4,500 square feet, the Ten Mile was more vulnerable to collapse than its neighbors.
County assessor records show it was built in 1972, when snow-loading standards weren't as sophisticated as they are today, and many structures built then don't meet the modern criteria.
Thirty years ago, local structural engineers say, builders relied on uniform snow load standards that didn't take into account things like uneven accumulations and heat transfer from the roof.
"Say you have a storm of 24 inches, with winds blowing in the other direction and an obstacle on the other side of the roof," said Pat Giberson, an engineer in Silverthorne. "You could have three feet on one side and only one on the other. That's where connections can get over-pressured."
It's unclear if that's what happened to the Ten Mile Room. Flat roofs aren't uncommon in Summit County and can be very strong under heavy snow loads, and building collapses are rare.
A combination of historic snow and an old roof with a potentially dated design, however, may have spelled the end for the Ten Mile Room.
The building has seen a fair amount of work in its time, but building permits dating back to its original construction don't indicate than any structural work was ever done to its roof.
It was a movie theater for years before converted to a conference center capable of holding around 500 people in 1990. Vail Resorts acquired it in 1998 and around three years ago remodeled the interior.
Vail Resorts replaced the Ten Mile Room's roof in 2013, although the work was not structural and only involved placing a new surface material on the top. Building permit records also show that there was asbestos mitigation done on the roof in 2015.
Commercial buildings aren't regularly inspected for structural integrity. Municipal and county officials inspectors are typically only involved during construction — with some exceptions, like if there are complaints or a clear life threat.
"We will permit and inspect, then when we turn it over we don't get involved — but occasionally people will ask us to come over," said Summit County chief building official Scott Hoffman, whose department does not have jurisdiction over Breckenridge or the Ten Mile Room.
The town of Breckenridge's policy on routine inspections could not be clarified in time for this article; however, officials in the other municipalities have said that, like the county, their inspection policies don't extend beyond construction.
Officials recommended that property owners with large, flat roofs bring in an engineer to check out their structure, know the signs to watch for and get snow removed if appropriate.
The Vail Resorts spokeswoman said that the roof of the Ten Mile was subject to regular maintenance.
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