At 1435 hours Truck 1 was dispatched to 4003 Volta St in Co 55's first due for the house fire. Engine 551 arrived with fire showing from the second floor of a 2 story residential house. Truck 1 arrived and assumed the first due responsibilities and started the search, threw 6 ground ladders and cut the roof. Truck 1 encountered heavy fire on the second floor as Engine 551 was making the knock on the fire. Both primary and secondary searches were negative and extension was limited to the walls on the second floor. Truck 1 remained on scene for overhaul and investigators until 1621 hours.