Trent Tarter Posted February 27, 2018 Report Share Posted February 27, 2018 Seen this yesterday on a new construction home. Not sure what would cause shingles to be raised slightly in straight lines? Quote Link to comment Share on other sites More sharing options...
John Kogel Posted February 28, 2018 Report Share Posted February 28, 2018 Are those ribs 4 feet apart, I think so. OSB with swollen lips. The stack sat out in the rain without a cover, and the edges all swelled up? I imagine that would do it. Quote Link to comment Share on other sites More sharing options...
Marc Posted February 28, 2018 Report Share Posted February 28, 2018 Maybe its my imagination but mid-span of those two lines is a third one running at right angles to, and between, the first two. John K's suggestion seems to fit. I thought that newer OSB wasn't supposed to do that. Quote Link to comment Share on other sites More sharing options...
inspector57 Posted February 28, 2018 Report Share Posted February 28, 2018 The roofer likely did the building paper at the same time as the shingles and lapped the paper on top of the shingles on those raised rows. Quote Link to comment Share on other sites More sharing options...
John Kogel Posted February 28, 2018 Report Share Posted February 28, 2018 2 hours ago, inspector57 said: The roofer likely did the building paper at the same time as the shingles and lapped the paper on top of the shingles on those raised rows. That is good practice, but doesn't leave a hump. Quote Link to comment Share on other sites More sharing options...
John Kogel Posted February 28, 2018 Report Share Posted February 28, 2018 3 hours ago, Marc said: Maybe its my imagination but mid-span of those two lines is a third one running at right angles to, and between, the first two. John K's suggestion seems to fit. I thought that newer OSB wasn't supposed to do that. That's right, the edges are painted. Green means one thing, orange another. A look at sheathing seams in the attic might show something. Quote Link to comment Share on other sites More sharing options...
John Ghent Posted February 28, 2018 Report Share Posted February 28, 2018 Could this perhaps be a modular home trucked to the site and assembled? Hard to tell whats going on just with a roof shot. Quote Link to comment Share on other sites More sharing options...
Trent Tarter Posted February 28, 2018 Author Report Share Posted February 28, 2018 10 minutes ago, John Ghent said: Could this perhaps be a modular home trucked to the site and assembled? Hard to tell whats going on just with a roof shot. The home was built onsite, standard stick frame construction. Engineered truss roof structure with OSB sheathing. Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted March 1, 2018 Report Share Posted March 1, 2018 Perhaps the OSB was soaking wet when the shingles went on. Afterwards, the OSB dried out and shrank, causing the buckling in the cover. Quote Link to comment Share on other sites More sharing options...
RK52 Posted April 3, 2018 Report Share Posted April 3, 2018 The two prominent ridge /bulges are 9 rows apart. If you look to the right, another 9 rows down you can see a third ridge. Pretty uniform, though nothing 9 rows up. I would expect to see quite a bit more perpendicular ridges too, if the OSB was soaked. Else all of it soaked along the long dimensions and not the short. The ridges are smack in the middle line of the shingles, too.... I'm guessing something *weird* in the installation process, and not the weather. Quote Link to comment Share on other sites More sharing options...
ejager Posted June 16, 2018 Report Share Posted June 16, 2018 I'm a little late to the discussion, but failure to leave spaces between the OSB sheets may result in buckling. Panel spacing is an APA RECOMMENDATION, to provide installers with a means of minimizing the potential for panel buckling; however, it is not a requirement. Some manufacturers may require a space at the time of installation. Panel buckling may be an aesthetic or serviceability issue but is not a structural deficiency. (http://www.apawood.org/buildertips/pages/M300.html) Quote Link to comment Share on other sites More sharing options...
John Kogel Posted June 16, 2018 Report Share Posted June 16, 2018 It's not too late, and thanks for the input. They are correct to say that a gap is recommended. But as usual, they back down then and say it is not a structural deficiency. That is wrong. When OSB swells, it can pull the nail heads through the wood, or just pull apart around the nail. Add wind, and you got structure damage. I'm just saying I wish the authority would speak up for best practices. Quote Link to comment Share on other sites More sharing options...
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