Grinding tiles around velux

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I have seen several threads where people mention grinding tiles to get them to sit better around a velux. I am having trouble getting marley moderns to sit nicely around a velux with edj flashing. The tile nibs around the velux were ground off but do you need to actually grind the tile down thinner to get it to sit properly?
The velux instructions were very good except all the pictures relate to a heavily profiled tile, there is no guidance for a flat tile.
The kick up around the velux I'm not too bothered about but some of the adjacent tiles are lifted exposing the interlocks, I'm worried rain can blow under them.
Thanks for your help.
Edit to add, the velux couldn't be shifted left or right to avoid cuts as it's a 550 between 600mm centres, it's going right through to the room below so moving the joist was out as the ceiling joist would also need moving.
 
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Not the best picture but hopefully you can see what I mean.
 

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Yes if necessary grind the back of the tile thinner, the first tile on each side is the most important as the rest land on those.
 
Thanks, do you just cut a recess?, the back of the modern tile is quite complex with the different reinforcement ribs so I couldn't quite figure out where to cut.
Also I've just spoken to velux technical who confirmed that a) I am an idiot and b) the instructions could be clearer (she had to go and ask someone to confirm). As I have flat tiles they should butt up against the gutter not sail over the top of it.
The instructions for the edj flashing simply say the tile should finish 30-60mm from the edge of the frame and the picture shows a profiled tile overhanging the gutter. The only picture of a flat tile shows the tile against the gutter but with a caution sign which I took to meant it was wrong and the tile must go over the gutter. Apparently the picture means the tile shouldn't kick up, which is impossible to completely eliminate anyway.
Once the rain stops I'll get back up there and do a bit of cutting.
Thanks
 
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The tile cuts into the side flashing central upstand.
You have cut sitting over the top of it. Not correct.
Turn the tile over, thin the top bar and nib.
They will then sit down better
Pretty obvious if you look to see what's keeping things up
 
The tile cuts into the side flashing central upstand.
You have cut sitting over the top of it. Not correct.
Turn the tile over, thin the top bar and nib.
They will then sit down better
Pretty obvious if you look to see what's keeping things up
Yep, as I say velux technical confirmed to me what you are saying, the reason I did it like that is because the installation guide shows a (profiled) tile running over the top of the upstand. The only place it shows a tile butted against the upstand it has a caution sign which makes it seem you shouldn't do it.
Thanks for your help, been keeping me awake all night :(
 
Do you still have to fold the edges of the apron up with flat tiles?
 
Thanks for your help, looks a million times better now. I know in the picture it looks like the tiles are still over the upstand but it's just the camera angle, they're all butted against it.
 

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