Spent the day researching a couple different brands of shingles, then bought Mystique 42 shingles, WeatherTex underlay/eaves sealer, some flashing for the edges, a bunch of 1.25" nails, some plastic cement, and a shingle remover tool. Then spent a bunch of time peeling up the shingles on one side of my garage (the side that was leaking). I'd do the whole thing, but it's another grand for supplies, and I'm crunched for time right now (getting ready to start doing spring cleanup once this is done).
A poor picture of the existing shingles (didn't think of doing this until after the sun went down).
I think I may have figured out why the shingles started leaking, for most of the bottom 1/2 of the roof, the shingles were nailed wrong, they should have 4 (or 6 for high-wind situations, rarely a problem here) nails just below the sealant strip, so the shingle placed over it just covers the nail heads. But most of these shingles just had 3 nails, in the middle of the upper 1/2 of the shingle, so the shingles weren't held down properly...
And I am very glad I went back to the store to get the special shingle-remover tool, as it made fairly quick work out of getting the shingles loose with the nails, vs doing the job with a shovel (which would involve ripping a bunch of shingles as well), and then going back over the whole roof to remove the nails so the roof is flat. The tool has a thin head that sticks out front, with a bunch of slots along the leading edge just wide enough for nails to go into the slot, with a heal to enable prying up.
A poor picture of the existing shingles (didn't think of doing this until after the sun went down).
I think I may have figured out why the shingles started leaking, for most of the bottom 1/2 of the roof, the shingles were nailed wrong, they should have 4 (or 6 for high-wind situations, rarely a problem here) nails just below the sealant strip, so the shingle placed over it just covers the nail heads. But most of these shingles just had 3 nails, in the middle of the upper 1/2 of the shingle, so the shingles weren't held down properly...
And I am very glad I went back to the store to get the special shingle-remover tool, as it made fairly quick work out of getting the shingles loose with the nails, vs doing the job with a shovel (which would involve ripping a bunch of shingles as well), and then going back over the whole roof to remove the nails so the roof is flat. The tool has a thin head that sticks out front, with a bunch of slots along the leading edge just wide enough for nails to go into the slot, with a heal to enable prying up.
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