Guttering end of roof valley

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Old 06-26-13, 09:56 PM
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Guttering end of roof valley

I have a couple gutter problems that I could use some pointers on. I have two roof valleys that end on an open roof edge and rain water just flies off the roof, digging a nice hole in the ground where it lands.

Roof valleys frequently end on an inside corner and guttering it fairly straightforward (at most you have to add a piece to the inside corner to snub the high speed water flow from flying over the gutter.

In my case I'm not even sure how to attach gutters near the valleys much less snub the water flow. I'm sure there must be solutions to this. Please take a look at my photos and tell me what you think:

(Erg, the forum downsized my images. Hopefully my notes are still legible. )

In the top image you can see the water damage to the shingles. I'm actually about to repair/paint the whole exterior, which is one of the reasons I'd like to get this fixed now. In a slow rain the water drops down and hits the shingles. In a big rain it flies off and lands several feet from the house.
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Here, with anything other than a light rain, the water would fly right over the (currently missing) gutter on the fascia below.
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Old 06-27-13, 03:44 AM
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Wow, what a design flaw! I don't know of any way of stopping the water from sliding off the side of the first picture. Guttering the dormer with a downspout taking the water to a gutter below would be the only way to stop the cascade problem you have there. Again a design goof. The dormer was added at some point and the roof lines collided at an ill point.
 
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Old 06-28-13, 07:02 AM
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Thanks for the reply. So there's no 'off-the-shelf' solution here?

I'm sure I could build something, the question is can I make it look good. Seems like anything I do will make the house look like some kind of Dr Seussian contraption (more a concern in the first picture since that's the front of the house).

In the first picture, at very slow speed some of the water actually gets to the end of the valley and glides down the rest of the roof instead of flying off. I could install a little 2' gutter on that fascia and pipe it down to the gutter below. Install some edging (maybe 1.5" tall) along the edge of the roof to keep the water from spilling off, and put a larger splash guard at the end of the valley. This might work but I'd worry the excess water will wash into the siding. Maybe I could just install normal gutter at that crazy slant? Is there a better product for this? Maybe a lower-profile gutter material?
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The second picture is the back of the house and I'm not too concerned with the gutter solution looking silly. I also think it's the easier problem to solve. I'll replace the missing gutter on the lower fascia. Then I can add a gutter to the dormer, the right side of which will pretty much do nothing but it would look silly not to full-span. I may have to add some blocking to the fascia to mount it right. Add a splash guard at the valley.
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Old 06-28-13, 07:08 AM
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Guttering the dormer with a downspout taking the water to a gutter below would be the only way to stop the cascade problem you have there.
Do you see any preference to the locations and angles of the connecting downspout? At the valley, away from the valley?
 
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