A fire broke out late Tuesday at the Trus Joist plant in Hazard.
The fire started around 10:30 Tuesday Night at Trus Joist in Perry County.
Firefighters say Thermal oil in one of the tanks caught fire.
Firefighters had to use foam to put out the flames.
They say they had the fire out about an hour after it started.
No one was hurt in the fire and officials say they still don't know what caused the oil to catch fire.
The plant has been in the news recently due to layoffs at the facility.