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Hello,
We have rusty corners around 2 windows' rander.
Would you please advise what caused it 
Many thanks
Emma
Hello @emmab1986
Welcome to the Bunnings Workshop community. It's sensational to have you join us, and thanks for sharing your question about your rendered corner.
I suspect that there is a steel support cap in that corner that has been exposed to the rain and is starting to rust. The render and cement sheet covering must be removed in order to access the steel support cap. The rusted cap must be removed and replaced with a new one. A new strip of cladding must be cut to size and installed in front of the corner and then sealed and rendered. It is an involved repair, and I suggest engaging the services of a trades person or builder to fix the damage properly. While the trades person is there. I also suggest having the cracks above the door fixed as well.
If you have any other questions we can help with, please let us know.
Eric
