A Friday the 13th fire ripped through a Sifton neighborhood home, forcing firefighters to battle from the outside a blaze already well on its way to destroying the single-story structure by the time they arrived.The home was a total loss and the fire is being investigated as an arson, Clark County Fire Marshal Jon Dunaway said Friday evening.Deputy Fire Marshal Curtis Eavenson is the lead investigator and is working the case with deputies with the Clark County Sheriff’s Office.Officials had reported no arrest in the case Friday evening.Vancouver firefighters summoned to 8518 N.E. 129th Ave. at 9:06 a.m., could see a header of smoke long before they got there.The house, a ranch-style wood-frame built in 1972, is home to Patricia Smith and her three children, said Capt. Scott Willis, a Vancouver Fire Department spokesman. It was fully engulfed in flames when firefighters arrived, but the occupants had safely escaped. Willis said visible flames could be seen through the doors and windows.Firefighters from four companies used their large 2 1/2 inch hoses to knock down the flames from the exterior, then moved in to extinguish flames in the attic and garage.