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Old 11-10-2011, 06:07 PM   #31
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Help with tricky valley


What was the reason for a W valley when that pitch requires a channeled valley? ( I assume some roofer made that for you. The one extra break and 5 second to make it would do wonders there.)
A 'W' is great when the slopes are the same. Worthless on that type.

The last pic shows a piece of W for comparison. Water won't cross a channeled valley. I assume it's too late to change?
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Old 11-10-2011, 10:34 PM   #32
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Help with tricky valley


I believe I owe you an apology.
I said; "What was the reason for a W valley when that pitch requires a channeled valley? ( I assume some roofer made that for you. The one extra break and 5 second to make it would do wonders there.)"

I feel I came off harsh, and or wrong. The comment, if I put =it right this time is directed towards a roofer. I believe you are a DIY'er and a roofer advised you to use the 'W'. You wouldn't know any better, but any roofer worth his salt would know the difference since the channeled valleys have been around since before the US was settled, and worked before I&W and other super underlays.
Anyway, if I sounded like I was taking you to task or anything else, I apologize. It wasn't meant that way at all. And if so, I'd rather apologize in public instead of PM.

I hope the link was helpful.
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Old 11-11-2011, 05:58 AM   #33
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Help with tricky valley


I can't make out much corner detail from your pix. The lower valley has to terminate 12" or so above the corner. Then the from of dormer shingles, then the term flashing. The upper section comes down and across all that about 12" and must not be cut. THe tinner's wing formed by coming around the corner will get trimmed as the siding and trim work go on.
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Old 11-11-2011, 07:35 AM   #34
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Help with tricky valley


IMO, in the best of all possible worlds that would be a field fabricated channeled valley that extended up the side of the dormer and was integral with the apron flashing at the bottom of the dormer.

It's tricky to find roofers who can do this kind of sheet metal feild fabrication, but it can be done, here's an example I saw recently.

Not a valley flashing, but it gives an idea of the complexity of the shapes they can be fabricated by a roofer who knows how to do this kind of work.
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Last edited by Michael Thomas; 11-11-2011 at 09:31 AM.
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Old 11-11-2011, 08:22 AM   #35
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Help with tricky valley


I say "W" or channeled valley metal, run it up the side of your dormer 6" or more. The water will run so fast down that 14/12 slope it will get under anything. But metal


Last edited by bcdemon; 11-11-2011 at 08:26 AM.
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