Ok I have read the directions on my Owens-Corning shingles. However
when I started to remove the existing old shingles I see they were
nailed in the tar seal strip. Now I am not sure if back 27 years ago
the installer had used nail guns. But the shingles are dried and very
bad but still I have no leaks.
Aside from the warranty being voided isn't this a good place to put
the nail for the following reasons?
1. The tar will seal around the nail shaft and the head after the sun
has done it's thing.
2. The sealing might stop the nail from popping up in the future.
3. The nail is a bit farther up from the above courses tab's lower
I am amazed that the nail is so close to the edge of the overlap
anyway when installed via the directions. I would think if anything
that the nail should go above the tar seal strip. That way any water
that might be pulled up under the shingle by capillary action would be
stopped by the seal of the two shingles before reaching the nail.
What do you think?
I hadn't heard that you should nail in the sticky strip...obviously
some shingle manufacturers are different. Owens Corning and GAF both
don't allow nails in the strip. The strips' sole purpose is to seal
down the flap of the shingle above, to prevent blow offs and wind
driven rain. If you put a nail in it, it will inhibit the sealing,
especially if the nail is a little high. I once wound up in court
over a roof, and the owner had a fancy inspector come and look at the
roof, and that was one of the few faults he found--nails in the
sealing strip. I guess if you really want to cover your ass, you read
the directions for each brand.
The information comes on many shingle packages.
I looked up the Tamko instructions and they clearly say to NOT nail into
the adhesive strip. Go to the url below and open the instructions pdf.
I wasn't able to quickly find installation instructions at the
Certainteed site, but I'd be very surprised if they recommended nailing
in the sealing strip. Can you provide a url to where you claim they
make this recommendation?
The directions in the pdf for the glass seal 3 tabs show the nailing area to
be the sticky strip.
No, you are reading the diagram incorrectly and the word choice is very
unclear, but if you read the detailed text instructions it makes it very
clear that you are to nail above or below the strip and not into it.
But, hey, it is your roof and your warranty to be voided so what do I
care? Nail in the strip if you like.
OK. I agree with you that for warranty purposes one should not nail in the
sticky strip. But seriously though, six 3/8" or 7/16" nail heads are not going
to reduce the surface area enough to make any pratical difference if you have a
good flat surface to work with. Usually there's a good reason behind, "Don't do
that!," but not always.
It isn't just the area of the nail head, the nail can also depress a
larger area around the head. If you lose 2" of length of the sealing
strip for each of 6 nails, that is 12" of the 36" length of the shingle.
Losing 1/3 of the sealing force is VERY significant. Even if you lose
only 1" that is still 6" out of 36" or 17% of the sealing strength. In
a high wind situation that very well could be the margin between a
tear-off and an unscathed roof.
I know it is hard for many people to accept that the people who actually
make a product know more about it than those who use it, but that is
often the case.
this looks pretty simple to me. how is anyone confused? the zone includes
the strip. BTW: any successful roofing contractor has guys with coil
nailers, slinging shingles at unreal rates, the nails will be all over that
strip in about a 3 " zone ~ everytime.
What part of "do not nail in the sealing strip" in the instructions
didn't you understand? The diagram is not clear and the written
instructions make it very explicit as to how to nail the shingles.
Yes, I agree that most roofers do quick and shoddy work. And,
apparently, most can't read either.
95 % of all roofs in the world with asphalt shingles are nailed the same
way. It's fine. don't read into it so much. The shingle manufacturer is NOT
going to buy you a new roof under warranty anyway. no matter how long the
you will never find a single roofing manufacturer pay you to replace your
roof, regardless of where the nails are. The warranty is completely
worthless. you think 30 year shingles should be inspected after 29 years to
make sure they are ok, if you find some unusual wear than the manufacturer
is going to come out & replace them??? that's pretty funny really.
The word choice is poor, but I believe you are reading this incorrectly.
I believe they are saying that the nails should be on the line shown
either just above or just below (preferred) the sealing strip. Zone is
very misleading and certainly suggests that nailing could occur anywhere
between the lines. If you read the detailed instructions at the link I
posted above, you will see that it says clearly that nailing should be
above or below the sealant in the area from 5/5" to 6.75" up from the
tab edge. It clearly says DO NOT NAIL IN THE SEALANT.
I have NEVER seen a shingle manufacturer recommend that nails be in the
sealant strip. Always just above or below, with below recommended as it
places less bending stress on the shingle and thus resists tear-off better.
The nails cover up part of the sealing strip and also place a depression
in it. This reduces the effective length of the sealing strip and hence
the amount of force that it can apply to the shingle being sealed to it.
Nailing in the strip is a bad idea and you want to nail slightly below
the strip per the shingle manufacturers instructions.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.