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Old 10-05-2010, 12:14 AM   #1
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Valley flashing, how wide should I go?


I have the roof tore down, almost ready for the rebuild... I'll be using overlap valley and alum flashing. It's a 4/12 hip w/dim shingles, probably the lifetime or 40+ GAF or OC (heard better about OC)
I see ACE has 24" and others have 12"... It seems on a lower roof 24" (12" each side) would be best.

Also I heard that 2 15# felts are better than 1 30# is this true?

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Old 10-05-2010, 12:27 AM   #2
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Valley flashing, how wide should I go?


Wider the better,and two lare of #15 felt and 1 layer of #30 are equal.I would just use the #30.Depending on your climate,you may want to use Ice and water shield.You would then have a bullet proof valley.

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Old 10-05-2010, 05:07 PM   #3
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Valley flashing, how wide should I go?


Sounds like a closed valley. Narrower is better. Sorry John.
You aren't supposed to nail in the metal, even to hold it in place. 24" metal means you would be stopping the nails 12" from center on each side. Therefore, 24" to 33" of your shingles would be un-nailed.
14" is the standard for valley metal.

'When the metal is pinned by nails, it oilcans and tears itself apart. All that movement isn't good for the shingles.'
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Old 10-05-2010, 07:13 PM   #4
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Valley flashing, how wide should I go?


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Originally Posted by tinner666 View Post
Sounds like a closed valley. Narrower is better. Sorry John.
You aren't supposed to nail in the metal, even to hold it in place. 24" metal means you would be stopping the nails 12" from center on each side. Therefore, 24" to 33" of your shingles would be un-nailed.
14" is the standard for valley metal.

'When the metal is pinned by nails, it oilcans and tears itself apart. All that movement isn't good for the shingles.'
I missed the overlap valley part,I guess when I read 40yr,I just figured open.
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Old 10-05-2010, 07:24 PM   #5
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Valley flashing, how wide should I go?


That actually works better for me as the 24" was a special order product. So if I don't nail the flashing, I use the edge clips or roofing cement to hold it down right?
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Old 10-05-2010, 08:09 PM   #6
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Valley flashing, how wide should I go?


Don't feel too bad. I miss many things too.
Just cleat it, edge clip in place. No cement. Cement has no place on ashingle roof, other than the top edge of counter-flashing. AND, under bend the metal and pust it into place. Over bending causes it to hump up.

My web site has tutorials on cap, chimneys, valleys. vents, etc.

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