Rockland firefighters got some unexpected practice Thursday morning after a training exercise sparked flames on a nearby warehouse roof.

Chief Scott Duffey said an additional ladder truck was sent to 136 Weymouth St. at about 10 a.m. Thursday to help put out the fire, which occurred when sparks from a saw caused insulation to catch fire. He said it took firefighters about 20 minutes to extinguish the flames.

Firefighters from Abington and Rockland had already spent several days doing training exercises at the building, which is slated to be demolished next week to make way for a new roadway that will serve SouthField, the massive redevelopment of the former South Weymouth Naval Air Station. Duffey said firefighters from both departments helped put out the fire.

“It was good to have the guys from both towns there,” the chief said. “We had enough manpower to take care of the situation.”

Duffey said firefighters plan to continue training exercises on the building next week.