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Old 06-22-2012, 09:13 PM   #1
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Shingles Curling


I replaced some sheathing and roofing shingles the other day on a part of my roof. I noticed while looking around that some of the shingles are starting to curl. They are GAF 3 tab soverign. They are about 8 to 10 years old. The roof was replaced before I bought the house and the inspector said that the roof was only a fairly new. BUT there ridge vent was not installed when the roof was done(horrible house inspector I guess). There is a big spot on the roof ridge where it is supposed to be but absent. Knowing now what I didn't know then with the importance of attic ventilation I'm supposing that I'll have to have it replaced. I probably end up doing it myself seeing as though contractor will cost too much. Is there anyway besides adding more ventilation of prolonging the current roof? Should I just go up there and put roofing mastic on the curling shingles I find?

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Old 06-23-2012, 06:59 AM   #2
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Shingles Curling


Post a picture.
Sure sounds like a classic case of poor venting causing over heating.
Your going to be playing wack a mole by trying to just keep patching this roof.

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Old 06-23-2012, 12:27 PM   #3
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Shingles Curling


Poor ventilation and it will be cheaper in the long run to do proper ventilation and put on a good 50 year roof. Might even want to add gable vents too.
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Old 06-25-2012, 05:34 PM   #4
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Shingles Curling


Here are some pics.
Attached Thumbnails
Shingles Curling-roof-0031.jpg   Shingles Curling-roof-0021.jpg   Shingles Curling-roof-0011.jpg  
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Old 06-25-2012, 05:38 PM   #5
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Shingles Curling


As you can see it has started to curl in some places. Maybe if get some attic ventilation going maybe I can save it.
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Old 06-25-2012, 06:55 PM   #6
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Shingles Curling


I think my eyes are playing tricks but it looks like your shingles are lined up and not staggered out If that is true that us very bad!
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Old 06-25-2012, 08:09 PM   #7
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Shingles Curling


What would happen if they weren't? I don't have any leaks in my house. I think the ones I pulled up were staggered. Starter shingles weren't used. In matter of fact we found one shingle turned upside down. But there seemed to be more on the edges then in the middle.

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Old 06-25-2012, 09:36 PM   #8
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Shingles Curling


Quote:
Originally Posted by Nailbags View Post
I think my eyes are playing tricks but it looks like your shingles are lined up and not staggered out If that is true that us very bad!
Looks staggered to me..

Matt Kiefer
Columbus Advanced Inspections
Columbus, Ohio Home Inspections
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Old 06-25-2012, 11:40 PM   #9
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Shingles Curling


Looks straight-up or "racking" pattern to me, as Nailbags said. The diagonal pattern is much better with wind. Notice the line going up the roof from wind damage. Put some dollops under them; compare Table 1, fig.6 and 13; https://ams.confex.com/ams/29Hurrica...per_167533.htm Click on the "PDF" high-lighted link to the paper. Use the "tools" to magnify to read it if over 50 years old......

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Old 06-26-2012, 07:19 AM   #10
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Shingles Curling


Racking or carpenter's pattern also channels the water in a straight line down the keyways every time it rains, putting premature wear on the same areas over and over again. A staggered pattern breaks up the water flow more evenly over the entire roof.

I'm not sure if I'd like to see a better picture of the eave/gutter detail or not.
You never want to combine gable and ridge vent in the same roof. If you have adequate soffit vents, use ridge vent. If no soffit the gables are okay but do NOT add ridge and gable vent.

As for the curling, either wind or a poor shingle. Not sure which though.
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Old 06-26-2012, 04:12 PM   #11
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Shingles Curling


Is there a particular size gable vent I should put in? There weren't any drip edges put in on the roof and there is siding on the house. I don't think their were very many or any soffit vents at all. Will have to pull the siding down to look.
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Old 06-27-2012, 11:55 PM   #12
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Shingles Curling


The gable vent would need to be huge; to be effective, scroll back a few to the Chapter start- "Attic ventilation"; http://books.google.com/books?id=Z8a...0vents&f=false

Are you seeing moisture on the roof framing or sheathing in the attic?

Is this the prevailing wind side of the house?

I notice the spots with the tab corners lifting -- line up with the trusses at both points (per gutter spikes). I think because they are higher than the sagging (mid-truss) sheathing (probably OSB), they tend to catch the directional wind, hence all tabs on one side only are lifted/curling. Venting the attic won't reduce the shingle temps enough to mention.

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Old 06-29-2012, 09:30 AM   #13
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Shingles Curling


one pic is the front side and two photos are from the back side.

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