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Tar Dots On Newer Roof

 
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Old 06-04-2018, 05:53 AM   #1
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Tar Dots On Newer Roof


Hi everyone. Long time lurker. I'm wondering if anyone has seen anything like the following:

Roof is less than 3 years old, architectural shingles.
"Dots" of flat gummy roof tar about 1/2" in size scattered throughout the roof.
Originally thought it was all the eastern facing sides indicating hail damage repair, but turns out they're on most of the roof (all sides).
Picking at them reveals nothing notable underneath - no nails, no notable dents or cracks.

Could it be possible that the blobs pulled off from the backs of other shingles in their bundles prior to installation?

Any other ideas or explanations?

I have attached a photo. Thanks!
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Tar Dots on Newer Roof-roofdots.png  
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Old 06-04-2018, 07:21 AM   #2
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Re: Tar Dots On Newer Roof


Do they taste like bird poop?

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Old 06-04-2018, 07:51 AM   #3
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Re: Tar Dots On Newer Roof


Theyre not bird poop unfortunately. I picked at a few and peeled up some of the tar. Needed mineral spirits to clean up.
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Old 06-04-2018, 12:39 PM   #4
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Re: Tar Dots On Newer Roof


Asteroid Turds.
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Old 06-04-2018, 01:44 PM   #5
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Re: Tar Dots On Newer Roof


looks like sloppy roofers on a hot day
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Old 06-04-2018, 05:03 PM   #6
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Re: Tar Dots On Newer Roof


Thanks, Griz. I was trying to make sure they're not a tell-tale indication of repair.
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Old 06-04-2018, 05:08 PM   #7
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Re: Tar Dots On Newer Roof


They all are 2 inches away from the edge of the next course. Maybe the punch out guy got sent back to tar up all the shiners.
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Old 06-04-2018, 05:16 PM   #8
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Re: Tar Dots On Newer Roof


Thanks, SmallTownGuy. I dug up a few and didn't see any nails but can pick at a few more to check. Seems like that'd be a lot of exposed nails (probably 200+ on the entire roof). Is that possible, even for a hack roofer?
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Old 06-04-2018, 06:36 PM   #9
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Re: Tar Dots On Newer Roof


Quote:
Originally Posted by dmask0 View Post
Thanks, SmallTownGuy. I dug up a few and didn't see any nails but can pick at a few more to check. Seems like that'd be a lot of exposed nails (probably 200+ on the entire roof). Is that possible, even for a hack roofer?

Oh itís definitely possible. Look close for a loose flap of shingle under the turd.
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Old 06-04-2018, 07:56 PM   #10
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Re: Tar Dots On Newer Roof


My first guess is that someone was stacking the shingles on a hot day and didn't bother to see if each pair was face to face or back to back. Sun hit the shingle and the tar spots melted to the next shingle. ...but that would be a smaller spot, no? I guess if you peeled up an edge you could compare that spot underneath and see if it's similar in placement and size.
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Old 06-04-2018, 09:24 PM   #11
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Re: Tar Dots On Newer Roof


Interesting how the tar marks appear to be the same distance up from the bottom edge of the shingle. I would call the manufacturer.
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Old 06-04-2018, 10:03 PM   #12
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Re: Tar Dots On Newer Roof


Does it happen to be in North Carolina?


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Old 06-05-2018, 05:41 AM   #13
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Re: Tar Dots On Newer Roof


SPG - I was hoping it was sloppy stacking during installation and not a bunch or nails or hail damage.

Mordekyle - no, not NC. This is in Stafford, VA. The house was built toward the end of a neighborhood development. It was one of the last houses built, so it wasn't during peak volume for the builder.

The roof went on in early Spring of 2015, probably before it got very warm.

I'll do some more looking today and maybe take a few more pictures.
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Old 06-05-2018, 06:58 AM   #14
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Re: Tar Dots On Newer Roof


I’ve seen it where the roofer didn’t know how to set the depth on his coil gun and was too lazy to carry a hammer (and use it). A good roofer always carries a hammer.

If the nails a set a little proud they will pop through the shingle above when they heat up and/or get walked on.
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Old 06-05-2018, 07:01 AM   #15
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Re: Tar Dots On Newer Roof


What kind of electrical work do you do?
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Old 06-05-2018, 07:32 AM   #16
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Re: Tar Dots On Newer Roof


Quote:
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What kind of electrical work do you do?
...

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Old 06-05-2018, 08:23 AM   #17
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Re: Tar Dots On Newer Roof


The shingles could have came like that out of the package.
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Old 06-05-2018, 09:24 AM   #18
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Re: Tar Dots On Newer Roof


Quote:
Originally Posted by Mordekyle View Post
Does it happen to be in North Carolina?


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Nobody?



Was there a student from UNC working on it?


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Old 06-05-2018, 10:53 AM   #19
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Re: Tar Dots On Newer Roof


Hey bigjohnson, I mostly support medium voltage ship power systems (15kV ship systems). I moonlight doing basic basement finishing with a local guy - sub panels, basic wiring, and sometimes framing depending on how busy everyone is.
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Old 06-05-2018, 10:54 AM   #20
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Re: Tar Dots On Newer Roof


Mordekyle, are you a Duke fan? Just wondering.

I'm in Virginia, so I don't take sides on NC teams.

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