Some of Notre Dame's remaining statues were removed by crane before the tarpaulins were hoisted up and workers began dragging them over to cover vulnerable parts of the structure in the afternoon.
Some workers told police they had sometimes smoked on the scaffolding, a spokesman for the company, Le Bras Freres, told Reuters.
After picking up seven cigarette butts following the fire, police questioned roof workers for the construction firm whose staff admitted to having violated strict no-smoking rules.
Firefighters managed to save Notre Dame after a massive fire gutted the roof and destroyed the spire of the landmark Gothic building, shocking Parisians and the world. Meanwhile, workers involved in the renovation told investigators they left behind cigarette butts, which may have played a role in sparking the fire.
"If cigarette butts have survived the inferno, I do not know what material they were made of", he said.
World Health Organisation tells parents to remove screens from young children
Children aged one to two years old should spend at least 180 minutes being active and 11 to 14 hours sleeping, the report states. Shorter sleep duration has been associated with more TV viewing and time spent playing computer games, it added.
He later added that the blaze started inside the building, seemingly freeing his workers from being implicated.
"This is not wrong", said a source close to the investigation, who declined all other comment. Professional mountain climbers were hired to install synthetic, waterproof tarps over the gutted, exposed exterior of Notre Dame Cathedral, as authorities raced to prevent further damage ahead of storms that are rolling in toward Paris.
Officials believe the fire was accidental, possibly caused by a short circuit linked to renovation work underway before the fire.
French President Emmanuel Macron has set a goal of rebuilding the cathedral in just five years -which some experts consider simply impossible to reach. Multiple cranes are positioned around the site, as the French president pushes for a speedy reconstruction after the fire consumed the cathedral's roof and knocked down its spire.
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