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Sealing closed cut valleys

7K views 7 replies 6 participants last post by  Ed the Roofer 
#1 ·
Hello, I am just about finished roofing my house. I used laminated 30 year shingles and membrane in the valleys. I've used Henry roofing cement around the flashings and roof penetrations. However, I was wondering if it would be better to use a 100% silicon caulk on the cut edge of the shingles in the valley, or continue to use the black roofing cement. Opinions?
 
#4 ·
Instead of lifting the shingles individually, simply lift them several at a time 'lifting gently from the cut edge' and place your 'roof cement' under far enough so it's not visible,
never use silicon under or in between shingles, it's not compatible and will never fully bond to the shingles and will prevent the shingles from re-bonding to each other.

In my area 'Youngstown, Ohio' we seldom run sealant down the closed cut valleys unless the slope of the roof is leass than a 4/12,
so depending on where your located and how teep the roof is, you may not need the sealant if you properly installed the valley.
 
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