I'm going to be rendering a wall which has a cut-back eave with colorbond fascia directly up against the bricks. Also, I have another section to render where there is a parapet with colorbond capping over the top of the highest course of bricks. I have been informed by my roofing guy that the worst thing in the world would be to have my render come into contact with colorbond. He said the lime in the render mix damages the colorbond and voids warranty etc. I'm not sure if he's over-reacting a...

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