The damage is estimated at $50,000 after a fire at an industrial building on Arnold Street in Wallaceburg.
Chatham-Kent fire crews were called to the scene at Accurcast Inc. shortly after 8 p.m. Tuesday for reports of a fire in the roof of the building.
Firefighters could see heavy black smoke coming out by the time they arrived.
Officials said the flames were around a chimney and that firefighters stayed at the scene for several hours to put out the hotspots and open sections of the roof to get the access they needed to extinguish the fire.
No injuries were reported.