Alarm #6.  Units were dispatched to a working house fire at 2211 Big Oak Road.  Units arrived to find heavy smoke conditions in an old balloon construction farm house.  Crews found the fire in the wall between a recent addition and the origional house, where the electrical wires come in from the panel. We had 5 units and 48 men in service for 1 hour & 28 minutes and  were assisted by FM 19.  OIC was Chief Brooks R Keen.