Ben H Posted April 13, 2011 Report Share Posted April 13, 2011 I'm not certain if this is wrong, but it doesn't make sense to me. The second run of the 3 tab are overlapped a lot more than normal. It was like that on both sides (gable roof). Truss built with thin plywood roof (1/2). Original ply was in rough shape from the lack of venting, so the roofers went over it with 5/8 osb. Click to Enlarge 80.19 KB Link to comment Share on other sites More sharing options...
John Kogel Posted April 13, 2011 Report Share Posted April 13, 2011 The sheathing is new, so this is not correcting for a layer of old shingles underneath. It may have been done for looks? Is this roof visible from the street? One downside would be that the mastic strip is high on that second row, so the lower edge of the third row is possibly not well glued. Link to comment Share on other sites More sharing options...
Ben H Posted April 13, 2011 Author Report Share Posted April 13, 2011 Not really visible at all. Click to Enlarge 54.14 KB Link to comment Share on other sites More sharing options...
Tom Raymond Posted April 13, 2011 Report Share Posted April 13, 2011 A very anal roofer wanted to hide the odd course. If it's well adhered I wouldn't worry about it. Link to comment Share on other sites More sharing options...
Ben H Posted April 13, 2011 Author Report Share Posted April 13, 2011 A very anal roofer wanted to hide the odd course. If it's well adhered I wouldn't worry about it. On both sides? This was a flip house, I can't image any anal anyone worked on it.[] Link to comment Share on other sites More sharing options...
Mike Lamb Posted April 13, 2011 Report Share Posted April 13, 2011 It looks like they used what's called "nesting" to place the new shingles. Saves a lot of time and they sit better but it looks like they didn't do it till the 2nd course which is wierd. http://www.asphaltroofing.org/pdf/tb_203.pdf Click to Enlarge 45.76 KB Link to comment Share on other sites More sharing options...
Ben H Posted April 14, 2011 Author Report Share Posted April 14, 2011 Mike, isn't that a practice used on a roof that has two layers? This house only had one. They stripped the old roof down to the beat up 1/2 ply, slapped some new osb on it, and then shingled it. Link to comment Share on other sites More sharing options...
Mike Lamb Posted April 14, 2011 Report Share Posted April 14, 2011 Mike, isn't that a practice used on a roof that has two layers? . Yes. I didn't read your post carefully. Sorry. It looked like nesting. Link to comment Share on other sites More sharing options...
emalernee Posted April 14, 2011 Report Share Posted April 14, 2011 Maybe they laid out the 5 inch exposure from the top down to avoid a small strip of shingles at the ridge? Or they couldn't figure out those complicated instructions on the back of the shingle bundles. Whatever the reason, I'm sure the installer had a scientific reason for it, they alway do. Link to comment Share on other sites More sharing options...
Brandon Whitmore Posted April 14, 2011 Report Share Posted April 14, 2011 Maybe they laid out the 5 inch exposure from the top down to avoid a small strip of shingles at the ridge? That was my thought as well. Link to comment Share on other sites More sharing options...
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