Where to end roof sheet for runoff into gutter.

[primetime]

Hi all.

I'm covering a flat concrete roof shed with corrugated iron at a shallow 1:10. I also plan to put a 112mm half round gutter on and collect the rainwater. I'm not sure where to end the roof sheet relative to the gutter for the most effective collection. ie not overshoot it and not dribble behind the fascia. Had planned on using a water hose and experimenting but was hoping someone could offer some advice. Thanks.

 

[catlad]

Well 2" is normal and at that shallow pitch I can't see it over shooting, as for running back on itself I create a drip edge with a pair of pliers on each trough if the roof is a bit shallow.

 

[primetime]

Great, thanks for that. Makes sense going about half way.