Plastic Quadrant as Arris Rail on Shed? Information, help and tips on many areas of roofing including trusses, tiling, venting, insulation etc....

[ojustaboo]

I'm going to put guttering on my workshop roof. But I want to stop the rain falling off the left and right hand edged.

OK I should have used wooden arris rails when I re-did the roof, but I didn't.

Can I simply put plastic quadrant mouldings down the left and right edge, stuck on with roofing felt adhesive?

Thanks