Cutting a hole in rendered blueboard

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Hi

I'm installing a gable fan, and need to cut a rectangular hole in the gable end for the grille (between the timber studs).

How to cut through the rendered blueboard? Masonry blade on a circular saw?

Thanks,
Andrew


Read the full thread at RenovateForum.com... (http://www.renovateforum.com/f85/cutting-hole-rendered-blueboard-107070/)