Classes at a Waterloo elementary school were called off Thursday after part of the building’s roof collapsed.

Architects and engineers have been called in to assess the damage at Lowell Elementary School and determine repair costs. According to Waterloo School District officials, a portion of the roof caved in above a classroom Wednesday morning, under the weight of heavy snow.

The city of Waterloo has received 26.2 inches of snow so far this month, already an all-time February record. The weather caused classes to be canceled district-wide on Wednesday, so no one was injured when the collapse occurred.

District officials are hoping to resume classes at Lowell on Friday.