Stupid alibi

Pot house blast guy: I knew nothing

HE ANSWERED the front door to a drug den — but now claims he knew nothing about the weed inside.

“I was not aware of any marijuana in that house,” Julio Salcedo, 34, told police after his arrest for his role in the blast that killed beloved FDNY Battalion Chief Michael Fahy, according to court papers released Wednesday.

Salcedo, who authorities say answered the door for Fahy after firefighters responded to a gas leak at the W. 234th St. pot lab in the Bronx, told cops that he only used the second floor to take showers, court papers state.

Salcedo admitted that he had noticed a container inside a bathtub. But he told cops that he did not think anything of it — despite hoses snaking out of the container into three locked rooms.

Authorities say those bedrooms were filled with pot plants the size of small trees.

“I don’t know what it was, and don’t find it odd,” a detective quoted Salcedo as saying.

Salcedo told the detective that he had moved into a first-floor room in June and worked six days a week at a car dealership on Boston Road — not leaving him much time around, court papers say.

At one point during his questioning, he admits that he did see marijuana plants in the basement during a visit from Con Ed two weeks before the Sept. 27 blast.

But he then wavered, asserting, “I didn’t know about the marijuana,” according to court papers.

His statement, in an interrogation room at the Cliffside Park Police Department in New Jersey, was not to look recorded, court papers state. A detective relayed it to Bronx prosecutors.

Fahy, a 44-year-old father of three, was struck by debris and died after the Bronx house unexpectedly exploded.

Salcedo and Garivaldi Castillo, 32, both pleaded not guilty in Bronx Supreme Court on Wednesday to assault charges that could put them behind bars for a maximum of 25 years. They are both being held without bail.