VANCOUVER, BC — Last August, an apartment building under construction near Dunbar Street and West 41st Avenue went up in flames. The fire started on the fifth floor and rapidly engulfed the six-storey project before leaping to the homes next door. …Vancouver Fire Rescue Services Capt. Matthew Trudeau said due to the extreme damage the exact source of ignition cannot be known for certain and fire investigators have deemed it an accident. But The Tyee obtained a WorkSafeBC report that suggests the fire may have started because of fire hazards at the site including workers’ “improper spray foam application” and friction burn from drilling. …The WorkSafeBC report says the Vancouver Police Department investigated the fire and ruled out arson. The report says the fire service narrowed the origin of the fire down to the fifth floor and offered three theories on the fire’s origins and spread.