I have a UPVC back door which I would like to replace, however the lintel above is a very old re-inforced concrete one (C1930's) and has started to rust. Result being I now have no concrete on the inside of the lintel, showing bare rusty metal. Would this still be OK? Or does it need ripping out and replacing? If so, I presume that I need to prop the wall above while doing it?
Thanks for advice... John
Thanks for advice... John