Units responded to the home at 2263 Gunsmith Square about 7 p.m. on Saturday.
Firefighters encountered heavy smoke coming from the roof of the three-story, middle unit townhouse upon arrival, FCPD said. Firefighters located the fire in the attic area and quickly extinguished the fire.
Three occupants were home when the fire broke out and escaped unharmed. Functioning smoke alarms were in the home; however, because the fire was in the attic area they did not activate, officials said.
Damage is estimated at approximately $14,000. Investigators said the flue caused insulation in the attic area to ignite.