Who is fully responsible for the injury caused by the ice trough on the roof?

Legal analysis: if the owner, manager or user cannot prove that he is not at fault, he shall bear tort liability. The damage of "ice valve" to people or things is a typical dispute over the responsibility of falling off or falling. Disputes over liability for damage caused by falling off or falling objects refer to tort disputes that cause damage to others due to the shelving of buildings, structures or other facilities and the falling off or hanging objects.

Legal basis: Article 1253 of the Civil Code of People's Republic of China (PRC). If buildings, structures or other facilities and their shelving and hanging objects fall off and cause damage to others, and the owner, manager or user cannot prove that he is not at fault, he shall bear tort liability. After compensation, the owner, manager or user, if there are other responsible persons, has the right to recover from other responsible persons.