Roof line to round shape gutter

[DIYspanner]

Can anyone say how far the roof's line should be below the top of a round profile rain water gutter channel?

I reckon about 1/2" below the top but advice welcomed. thanks

 

[noseall]

Can anyone say how far the roof's line should be below the top of a round profile rain water gutter channel?

I reckon about 1/2" below the top but advice welcomed. thanks

Height looks ok. The tip of the green bit however, needs to be aiming for the centre of the gutter channel and not to the far side. Your tiles are overhanging too far if the image is correct.

 

[DIYspanner]

Its a conservatory roof with 15mm poly sheets although may change to 25mm heatguard sheets I've seen fleabay.

Is the revised below about right?

 

[Mw Roofline]

 

[DIYspanner]

There's a fit bit adjustment to do because some of the roof line shoots over the outside edge of the gutter channel.