Three Irishmen implicated in a roof repair scam targeting the elderly have been jailed by an Australian court.

The District Court in Perth had been told that John Jason O'Brien, 18, Thomas Kiely, 19, and Desmond O'Reilly, 23, conned elderly people, some aged in their 90, into believing their roofs needed repair.

The men climbed onto roofs and damaged them, before approaching their victims and offering to "fix" them.

One man, who lives in the Perth suburb of Floreat, was duped out of $22,000.

In some instances the scammers drove the victims to the bank to withdraw money.

When police raided their accommodation at the Banksia Tourist Park in Hazlemere, they found almost $65,000.

The men were subsequently charged with gaining benefit by fraud, stealing and criminal damage.

The had been detained at the Yongah Hill Detention Centre.

At the sentencing last night District Court Judge Laurie Levy described the scam as a "sophisticated scheme to defraud and target elderly people".

He said none of the men were the "driving force" of the scam, as others were also involved.

O'Brien was sentenced to 13 months jail, while Kiely and O'Reilly both received eight-month sentences.