Can I use plastic quadrant instead of Arris on my garden shed/workshop

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Hi all.

OK, I know I've screwed up, it's felted perfectly (decent torch on) apart from one thing, I didn't use any arris rail.

I'm about to put gutters at the front and rear of the shed, but I want to stop water going off the sides.

I was thinking using roofing adhesive to stick plastic quadrant along the side edges of the roof and hope that makes most of the water go towards the gutter.

Is that a stupid idea or should it work?

See pics for bad drawings of what I mean (and the sort of quadrant I was thinking of using).

Thanks

rain 1.PNG
rain2.PNG
rain3.PNG
 
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If you can find an adhesive that will keep that in place, let us all know what it is called please.(y)
 
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You can screw something to the edge of your roof
and then torch some felt over it to create a kerb.
 
How about using flashband (i.e. the sticky-backed stuff) as it is only 10ft on a side. For a neater finish, you could even get creative maybe by trapping the outside edge of the flashband under the fillet, screwing the fillet onto the decking, then dressing the flashband over the outside/vertical and inside/sloping edges of the fillet, and thence onto the roof. You'd need to make sure you had enough overlap onto the roof, using the pukka flashband primer. Avoiding creating creases might be difficult at first, but I have found it to be reasonably forgiving for shed roof edging with a bit of practice. I'd use a decent roller to firmly munge the flashband down onto the well-primed surface.

This is intended to be a DIYer's answer, as it would not pass muster with some here.

If you did your own torching - do what catlad said.
 
Ali angle (or UPVC angle)screwed to underside edge with one side sticking up would do it . Not pretty though ,
 

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