Another benefit of stripping the old shingles became apparent when I did mine.There was some noticable seems across the roof trough the shingles.When looking at the sheathing the span between the framing allowed for the sheathing to bow different directions and having high spots shortened the life of the shingles by having a crease on the protruding sheathing.On new construction most builders will install "H" clips in the middle between the framing to keep the 2 butting sheets on the same plane.I found an easy way to install them without pulling up the sheathing.Simply drilled a hole at the butt joint just big enough for the clip and slid them in place.Worked great.
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SIKSUKR
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