We didn't do a granite backsplash, but we did tile all the way up to ur ceiling. We mounted a piece of wood the same thickness as our tile and underlayment where the hood needed to attach to the wall. That way the hood could be attached to the wall without drilling through the tile. Your granite fabricator could do a cutout in the granite where the wood mounting piece would go.

I read so much of the forum I recognize you as one of the regulars. Thanks for the pics you posted because it makes it a lot easier to understand. So are there no tiles behind the wood and underlayment where the hood is today, whereas in my case the wall granite slab will be a reverse cutout in the shape of the entire hood?

Yup, the wood was mounted, and the tile installed around it. The wood is significantly smaller than the hood, but big enough to cover all of where hood's attachment points are.

You would want to scope out where the attachment points on your particular hood are, and make sure the wood piece would be big enough to cover that area. You could then supply the wood to the granite fabricator so that he could plan to cut a hole in the granite to accommodate it.

This is just an idea based on what we did....there may be other options out there for you. Hopefully some others will pipe up and share.

Thanks for responding so quickly alko_05. I understand now, and will talk to the fabricator again. Like you said there may be other ways. I am hoping the granite can go up in one piece in case the hood needs to be replaced some years later. I have seen many pictures of gorgeous kitchens in this forum with vent hood and granite behind all the way to the ceiling. Are there others who can share their install experiences with me? Thanks in advance!