Tar Dots On Newer Roof

 
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Old 06-05-2018, 12:06 PM   #21
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Re: Tar Dots On Newer Roof


BigJohnson thinks the nails weren't driven deep enough and are popping through the layer above. Great theory.

Others think they could have come out of the package that way, could have been a lot of shiners covered up, or just sloppy stacking by one of the crew during install.

These are the four best theories - so thank you all for the suggestions. I'll be there tonight prying some up and looking deeper.
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Old 06-05-2018, 05:41 PM   #22
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Re: Tar Dots On Newer Roof


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Iíve seen it where the roofer didnít 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.
Your first idea was good asteroid poop, but the second idea makes a lot more sense you never know with asteroid poop it just DEPENDS .
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Old 06-05-2018, 09:55 PM   #23
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Re: Tar Dots On Newer Roof


Not really a fan of any teams.

Semi professional at dad/bad humor. Expert at corny jokes.


The Tar Heel reference apparently fell flat.



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Old 06-06-2018, 02:31 PM   #24
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Re: Tar Dots On Newer Roof


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A good roofer always carries a hammer.
Sure does, usually laying on the deck within a few feet of them
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Old 06-06-2018, 02:52 PM   #25
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Re: Tar Dots On Newer Roof


Mordekyle - the tarheel joke was pretty good but went right over my head. sheesh.
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Old 06-07-2018, 05:33 AM   #26
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Re: Tar Dots On Newer Roof


Okay guys wanted to follow up. As far as I can tell, they most likely came from the factory that way or are maybe from stacking wrong during install.

I scraped off a bunch of the dots last night in multiple sections. No nails underneath so that likely eliminates the errant nail theory (shiners).

There is no evidence of damage under the tar. It scrapes off and reveals the gravel surface of the shingle. No noticeable dents or damage.

Next, I pried up a bunch of the shingles and looked under the dots. No nails underneath any of them. That likely eliminates the proud nail underneath theory.

Finally, it looks like the tar on the shingles is different from the tar that the roofers used on the last ridge vent nails and on some edges of some flashing. It's a different color (black vs gray) and has a different texture. Makes me think the tar on the shingles maybe came from the factory that way or maybe is from stacking them wrong.

In any case, I like the outcome and wanted to thank everyone for the feedback. I learned a little about roofing and asteroid poop.
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Old 06-07-2018, 06:48 AM   #27
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Re: Tar Dots On Newer Roof


On a whim, I took a second look at the photos, discussed my suspicions with a friend who is an entomologist, and agrees these were most likely left by the American Tar Beetle.

Harmless, but messy creatures.
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Old 06-08-2018, 06:56 PM   #28
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Re: Tar Dots On Newer Roof


Iíve never seen them manufactured, but I think shingles are on a roll that Is Laminated and then is cut into individual shingles.

I imagine theyíre laminated together, and the tar line is applied.

Maybe a line at supplies tar was leaking or dripping onto the shingle surface.



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Old 06-08-2018, 07:30 PM   #29
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Re: Tar Dots On Newer Roof


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Originally Posted by dmask0 View Post
Okay guys wanted to follow up. As far as I can tell, they most likely came from the factory that way or are maybe from stacking wrong during install.

I scraped off a bunch of the dots last night in multiple sections. No nails underneath so that likely eliminates the errant nail theory (shiners).

There is no evidence of damage under the tar. It scrapes off and reveals the gravel surface of the shingle. No noticeable dents or damage.

Next, I pried up a bunch of the shingles and looked under the dots. No nails underneath any of them. That likely eliminates the proud nail underneath theory.

Finally, it looks like the tar on the shingles is different from the tar that the roofers used on the last ridge vent nails and on some edges of some flashing. It's a different color (black vs gray) and has a different texture. Makes me think the tar on the shingles maybe came from the factory that way or maybe is from stacking them wrong.

In any case, I like the outcome and wanted to thank everyone for the feedback. I learned a little about roofing and asteroid poop.
It's not tar it is shingle sealant
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Old Yesterday, 02:45 AM   #30
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Re: Tar Dots On Newer Roof


You see the little sliver of shingle in the red circle? Sometimes that little flap of shingle blows off and leaves a spot of tar right there. But can I ask why u didn't take closer pics if you were up there? The spots in the green look smeared. Like someone was walking around with a caulk gun on their belt and they forgot to release the pressure so it just dripped everywhere. Does it smell like chocolate?
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Old Yesterday, 07:20 AM   #31
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Re: Tar Dots On Newer Roof


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. But can I ask why u didn't take closer pics if you were up there?
Didnít want to wreck his drone Iím guessing. Lol

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