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Old 11-10-2007, 11:57 AM   #16
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Which Roof & Flashing Sealant Do you Prefer?


Ncgrogen, When I replaced the blown off ridge area shingles at my brother-in-law's house I ended up reusing almost all of the ridge caps. I finally found a local source for NP1, and used it to adhere the the caps down. Really strong bond with the NP1.

The PL polyurethane roof sealant seemed to work work very well over nails which were popping up through many of his old shingles. I pulled them out, poly'ed over the hole, coated the nail, then replaced it. The poly cured tack free and adhered well. Seems to be quite durable. Time will tell how it stands up to UV from the Sun.

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Old 11-10-2007, 10:06 PM   #17
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Which Roof & Flashing Sealant Do you Prefer?


Should Have Replaced The Shingles Doc !
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Old 11-11-2007, 11:07 AM   #18
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Which Roof & Flashing Sealant Do you Prefer?


TRG, Yep, quite right. His decision though. Probably a good one short term. Roof is showing it's age and should be replaced.
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Old 01-08-2008, 12:44 AM   #19
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Which Roof & Flashing Sealant Do you Prefer?


I may get some flak for this, but I have found out that sealants are the weakest component in a roof. They don't weather well, they get hot, freeze, and simply don't hold up over the years. The materials which make up an ideal roof should last for decades, and have similar durability.

A well built roof is one in which relies solely on gravity to keep out water - nothing else. Where caulking and sealants are relied on to keep out water, it will always fail.

No exposed nails or fasteners, no shoddy patch jobs with tar or roof cement, and no caulking anywhere.

Flashings should be soldered, and made with a durable metal like copper or tin.

Caulks rarely last the life of the roofing material, so why would you want to make it a part of your roof?
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Old 01-08-2008, 10:36 AM   #20
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Which Roof & Flashing Sealant Do you Prefer?


a knowledgeable contractor knows where to put sealants,to say they have no place on a roof is naive,even a pipe vnt flashing made of lead should have sealant placed underneath it prior to install(to prevent back up situations),and flue pipes need to be sealed at the collar,power vents should be sealed underneath prior to setting the unit,and the list goes on and on,including sealants used to seal reglets at chimneys ,and walls.
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Old 01-08-2008, 01:11 PM   #21
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Which Roof & Flashing Sealant Do you Prefer?


One comment about sealants.

Even the lousiest brand of sealant will remain pliable for extended periods of time if it is shielded from the UV rays of the sun or is installed and encapsulated, as in the situation behind the attachment of the sheet metal counter flashings.

It is exposed sealants that suffer the most degradation.

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Old 01-08-2008, 02:32 PM   #22
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You guys are right. Thanks for the advice. I have minimal roofing experience. We had a new roof put on in 1998, and two years ago we fixed the leak that was caused by a poor repair (caulking). Obviously, it was exposed to the weather and didn't hold up.

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