Roof repair on a 1960s or 1970s ranch-style single-family home usually means pulling the failed field of asphalt shingles, checking the substrate for rot, and re-nailing with ring-shank nails where the decking is sound.
For mid-century modern tract homes with pitched roofs, the weak points are the valley, chimney flashing, and pipe boots. We reseal with roof cement or mastic, reset the step flashing, and caulk only where a mechanical seal is not possible.
On contemporary suburban developments built in the 1990s and 2000s, granule loss and dried sealant are the usual call. Resetting the drip edge, ridge cap, and counterflashing instead of tearing off the whole rooftop keeps thousands of pounds of shingle out of the dumpster.
A targeted repair that replaces the underlayment under one leak costs far less than a full re-roof, and it delays a tear-off until the shingle actually fails.
