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Valley flashing, how wide should I go?

9K views 5 replies 3 participants last post by  tinner666 
#1 ·
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?
 
#3 ·
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.'
 
#6 ·
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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