The roof collapsed at the old Cheng-Du restaurant building at 3:16 a.m. on Friday, causing damage to the two vacant buildings adjacent to it, according to Captain Scott Breen of the Stoughton Fire Department.

There was no one in these vacant buildings at the time of the collapse.

The building, located at 762 Washington St. in the downtown area, had been vacant since a three-alarm fire caused extensive damage in October of 2009.

The roof collapse caused windows to shatter in two vacant storefronts adjacent to the former Cheng-Du location. One window also shattered at the Malcom and Parsons Insurance Agency at the corner of Washington and Freeman Streets.

Police noticed storefront windows shattered in downtown Stoughton just past 3 a.m. Friday morning, with glass found on both lanes of Washington Street, which led officials to discover the collapsed roof.

Captain Breen said the Malcom and Parsons storefront will be closed until the building is completely inspected and it is deemed to safe to open.

Any flat-roofed building with this amount of snow on it is a concern, according to Captain Breen, but he said the October 2009 fire compromised the integrity of the building, which when coupled with the weight of more than three feet of snow, most likely led to the roof collapse.

The Stoughton Fire Department also responded to a call at 37 Dykeman Way Thursday at 3 p.m. for a small section of roof that bulged at the Furniture Décor section of the building, causing part of the sprinkler system to break.

No other storefronts were damaged in that building, located just before the Route 24 overpass near the Christmas Tree Shops, according to Lt. Gregory Goldberg of the SFD.

The Dykeman Way building was evacuated for precautionary reasons, although Lt. Goldberg said no one was injured. The other storefronts were able to remain open.

Lt. Goldberg said this roof bulge was caused by too much snow weighing down on a flat roof.