What DOESN'T expanding foam stick to? I want to bridge a gap in the apex of a roof, that foam would droop away from, so need to install a temporary 'shelf' until it has hardened.
Picture here:
(Background: this is a barn with fibre cement roof that I had sprayed with foam insulation some years ago, but they failed to seal the apex properly despite claiming that they had. Access is extremely difficult as the barn is full of immovable objects (large lathes, milling machines etc) and the apex is about 15 foot up so it will have to be done in short sections - its about
40 foot long)Andrew