Ventilation: The Leak That Is Not a Leak — Inspection Notes
What a real inspection covers on an asphalt shingle roof in Uptown, and what usually gets skipped.
A roof inspection is only as good as what gets looked at, and a lot of what gets called an inspection is a walk round the garden with a phone camera. This is what a real one covers on an asphalt shingle roof in Uptown Whittier.
What actually matters
A shingle roof is a water-shedding system, not a waterproof one. Every course relies on the course above it and on the underlayment beneath, so the covering and the layer under it fail together and have to be judged together. An inspection that does not account for that is looking at the wrong layer.
The detail that is usually left out
An inspection is only as good as what gets looked at, and photographs of specific defects are what let you get a second opinion without a second visit. The starter course and the drip edge are where cheap work shows first. A starter strip laid the wrong way round, or an eave with no metal under the first course, will wick water back into the fascia no matter how good the shingles above it are. Anything under half an hour on an average house has skipped something.
What is specific to Uptown Whittier
Summer is the problem here. Uptown sits inland with no marine influence to speak of, so a roof surface that reads ninety degrees at the coast is well past a hundred and fifty on Greenleaf by mid-afternoon, and it holds that heat for weeks. Everything on the roof expands into it and contracts again overnight, and it is that daily movement, not the peak temperature, that opens laps and backs fasteners out. Much of Uptown went up between the 1920s and the 1940s, which means original board decking, ventilation that was never sized for this much heat, and often a layer somebody roofed straight over rather than tearing off.
The full inspection list
- Granule loss across the field, and how much is sitting in the gutters
- Curling, cupping or cracking, particularly on the sun-facing slopes
- Nail placement and whether shingles have begun to back off the deck
- Uptown Whittier construction, and whether it is woven, closed-cut or metal-lined
- Flashing at every wall, chimney, skylight and pipe penetration
- Deck condition underfoot, checked by walking rather than by eye
- Attic ventilation, both intake at the eave and exhaust at the ridge
Common questions
How long should an inspection take?
Long enough to get on the roof and into the attic. Anything under half an hour on an average house has skipped something.
Should I expect photographs?
Yes, and of the specific defects rather than general views. Photographs are what let you get a second opinion without a second visit.
The honest summary
Shingle roofs rarely fail suddenly. They give years of warning through granule loss and edge curl, and the difference between a planned replacement and an emergency one is usually whether anybody was looking. In Uptown Whittier the thing to watch is attic temperature and intake ventilation, because an Uptown attic that cannot breathe cooks the underside of the roof as hard as the sun cooks the top.
Free inspection, drone photography where access is difficult, and a written estimate with deck repair priced per sheet. No obligation.
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