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Ben H

Overlapped too much?

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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.

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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.

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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.[;)]

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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.

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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.

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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.

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