I’ve got a section of roof where water from a higher section of roof cascading over the edge lands, and that section is in very bad shape. The rest of the roof still has a few years left, so I’d like to reshingle just the bad section. It’s only about 100 square feet, so I think this is something I can handle. I’ve already added a gutter to the corner of the upper roof, where the water was coming from, so the underlying problem is fixed.
My plan is to leave the existing shingles in place, adding the new shingles over them, starting from the bottom, and working up. I’ve read about replacing individual shingles in “home handyman” type books, where the old shingle is removed, and the new one is slid into its place. I’m hoping the same technique can be used at the upper end of the repair area. Is this feasible? Is there any other way of integrating the top row of new shingles into the existing ones? The upper row will be 10 to 15 feet long.
Would I need a new layer of roofing felt (or some other material) over the old shingles before the new shingles are added, or do I just put the new shingles up?
Any other gotchas I should look out for, or any tips on this? Any gotta-have specialty tools?
Roof is about 10 or 12 years old (we bought from the builder, but they’re known for using cheapest materials and workers they can find).
Shingles are asphalt, with I believe three tabs per shingle.
The roof is fairly steep, but I’m comfortable working on the roof. (I’ve been installing a rooftop antenna there, since I’m planning on repairing/replacing it anyway, and wasn’t worried about the foot traffic.)
The section to be repaired is over the garage, and triangular with a side edge mostly along the house, and the angled edge ending at a valley with another part of garage roof.
I’m not sure how easily I could access the underside of the repair area.
I’d be happy to get even a couple of years out of the repair, but I’m shooting for at least five. (although I’m thinking it’ll either leak in the first year, or easily make five, with no in-between.)
I expect we’d completely strip off of the old shingles when we eventually get the entire roof redone.
No known leaks yet.