A deck collapse in Copiague buried two construction workers Monday, sending one to the hospital with critical injuries, Suffolk police said.

They were working on the footings of a deck at a Desoto Road home when the collapse occurred about 1:30 p.m., police said.

The critically injured man, 56, was taken to Southside Hospital in Bay Shore, while his co-worker, 19, had minor injuries and was treated at Good Samaritan Hospital Medical Center in West Islip, authorities said. Police did not release their names.

Copiague Fire Chief Daniel Campion said the rest of the house had been elevated and the workers were trying to do the same with the deck when the entire structure came down.

One man sustained bruises and cuts but the older one was saved by his medic, the chief said: “The guy had a cardiac arrest, and my medic brought him back.”

Both are employees of Vision Home Improvement, hired by the homeowner as part of the state’s New York Rising program to help elevate and renovate a house damaged by superstorm Sandy, police said. They were the only ones working at the deck at the time, police said.

The company and the homeowner could not be immediately reached for comment.

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First Precinct detectives were at Southside Monday evening to try to interview the worker. They and the federal Occupational Safety and Health Administration will conduct a joint investigation on the cause of the collapse, police said.