The developer Stanley Holdings has begun work to fix fire safety defects in nearly 300 housing units in Belmayne, north Dublin.
However, some residents whose concerns were rejected by fire officials nearly a year ago want a fuller investigation.
Del Tillyer, whose home had been undergoing remedial works for sound insulation problems, raised issues with the fire officer last year
The council's fire inspector said last July that the gaps highlighted were not breaches of regulations and that its inspections did not reveal any issues.
However, Stanley Holdings alerted the council last week when it did discover a lack of internal fire insulation while carrying out repair work in another dwelling
It says 276 properties built by a connected developer may be affected
A fire expert hired by residents says the problems go deeper and there have been calls for an independent inspection.
However, Dubin City Council says the developer engaged its own safety consultant and that works over the next three months will remedy the defect