Can you repair roof shingles, and how?
Short answer. Yes, individual shingles can be repaired or replaced as long as the surrounding shingles are still flexible. The job is to break the seals on the shingles above, pull the nails holding the damaged one, slide in a matching replacement, nail it in the nailing zone, and reseal the tabs above it.
Replacing one shingle, step by step
- Work on a mild, dry day, ideally in the morning.
- Slide a flat bar under the shingle directly above the damaged one and work along its length to release the sealant strip. Repeat on the next course up, because nails from two courses can pass through the damaged shingle.
- Pull the nails holding the damaged shingle, including the nails from the course above that go through it.
- Slide the old shingle out and the new one in, aligned with its neighbors.
- Nail it in the manufacturer's nailing zone, usually four nails, or six where high wind nailing is specified, then renail the shingle above.
- Seal the lifted tabs with small dabs of roofing cement and press them down.
When repair is not a good idea
- Shingles crack or snap when you lift them, a sign they have lost their oils to age.
- Granule loss is widespread and the black mat shows in many places.
- Hail bruising runs across slopes; patching a few spots can hide damage that may be covered.
- Your shingle line is discontinued and the patch would sit on the front of the house.
A note on matching
Even an identical new shingle looks darker and cleaner than weathered ones for a year or two. That is cosmetic on a back slope but noticeable from the street. See shingle types and how long roofs last in Georgia to judge whether yours is still worth repairing.