I'd like to buy an overdoor hanger but the door is 4.25 cm thick; all the hangers I have seen fit doors up to 4cm thick. Does anyone know if/where I can buy a wider overdoor hanger for thicker (fire) doors please?
firedoors shouldn't have a gap at the top wide enough for an overdoor hanger to be used. The very purpose of the door is to stop smoke and heat getting through.
As BillyBB says just screw something to one side of the door and put the hanger there