Best Cement(brand) To Seal Asphalt Shingles To Copper Valley - Roofing/Siding - DIY Home Improvement | DIYChatroom

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Old 12-04-2008, 10:09 AM   #1
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Best cement(brand) to seal asphalt shingles to copper valley

I promise as soon as I learn everything there is to know about roofing I will stop asking questions.

Two questions please.

1. What is the best cement for sealing asphalt shingles to copper valley metal in open valley?

Certainteed suggests SBS, SBR, or rubber based caulk.

2. What is best for brick chimney and copper flashing?

Certainteed suggests urethane.

I have deep respect of the opinions of you all who actually do this for a living so here I am.

Is NP1 good? (oops, that makes three questions)

Thanks in advance, as usual.

Have a safe day,



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Old 12-04-2008, 07:08 PM   #2
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I've found NP1 very nice for sealing the mortar cuts for counterflashings on chimneys. I refuse to use any type of mastic in valleys. Never have had a reason to. I guess if I were going to, I'd definitely recommend an sbs modified. (Henry's 908 or the like)


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Old 12-07-2008, 01:27 PM   #3
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Just bend a return into the valley sheet. No need to seal them together. A sealant can actually cause water to be pushed into the roofing system at valley locations.
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