Father-of-four Gareth Bickerstaffe had become "erratic" and "unpredictable" after going to the Express store in Manchester in May last year.
An inquest into the 34-year-old's death heard he had been suffering from paranoia caused by cocaine use.
On the day of his death, Manchester Evening News reported the dad had climbed into the store's roof space in Hathersaw, Oldham, convinced someone was "coming for him".
Medics were called at 10.43pm, with the Greater Manchester Fire and Rescue Service not called until 10.44pm. They arrived three minutes later.
After his death, Gareth's family's legal counsel had argued an earlier rescue attempt could have been made if fire services had been called when he first tried to harm himself.
The coroner heard he had been using drugs for a decade before his death, having lost his mum when he was just 12.
The dad had been taking an increased amount of cocaine, cannabis and alcohol in the months before his death.
He had gone to hospital several times in the first half of last year but declined psychological therapy and treatment.
But Coroner Lisa Hashmi said there had been a "limited" window of opportunity to save him even if fire services had been called earlier.
She said: "Against a backdrop of long term illicit substance and alcohol misuse, depression and personal tragedy at a young age, in the months leading up to his death, Gareth had started to exhibit increasingly frequent episodes of paranoia and associated erratic and sometimes dangerous behaviour."
"This brought him into contact with mental health RAID teams on three separate occasions between January and May 2018. Assessments were conducted and support offered but declined.
"Whilst a number of concerns arose from the circumstances surrounding Gareth's contact with mental health services in the months before his death and the emergency response on the night of May 20 2108, none of these were casually linked to his death, on the evidence heard, to the required legal standard."
The coroner recorded a conclusion of misadventure.
- IF you are having suicidal thoughts, suffering from anxiety or depression or just want to talk, call The Samaritans on 116 123.
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