Choosing a Shingle for the LA Basin UV Load — Myths and Facts
How to read an estimate for an asphalt shingle roof in the Harbor Area, and what to walk away from.
Choosing a roofer is mostly a matter of reading estimates properly, which nobody teaches. For an asphalt shingle roof in the Harbor Area, this is what to compare and what to ignore.
What actually matters
Layer count, deck condition and roof complexity move the figure more than the shingle you choose. Tearing off two existing layers instead of one adds disposal and labour before a single new shingle goes down, and a cut-up roof with several valleys and dormers takes far longer per square than a simple gable.
The detail that is usually left out
Read the exclusions before the total. The cheapest quote and the best quote are occasionally the same document, and the exclusions are how you tell. 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. Ask how it will be handled in writing, and the rest of the job tends to go the same way.
What is specific to the Harbor Area
Humidity stays high, salt is constant, and industrial fallout settles on top of both. Flat and low-slope roofs dominate the commercial stock here, and a membrane that would give twenty years in a dry inland setting can give noticeably less with that combination working on it every day. Much of the building stock is older commercial and industrial with large low-slope areas, parapets, and rooftop plant that gets walked on regularly.
What we look at before quoting
- 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
- Valley 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
Is a deposit normal?
A reasonable one is. What is not normal is a large payment before materials are on site, and California limits what can be asked for up front.
How many quotes should I get?
Three is plenty. More than that and you tend to be comparing sales technique rather than scope.
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 the Harbor Area the thing to watch is membrane condition around rooftop plant, parapet terminations, and every drain and scupper on the roof.
Free inspection, drone photography where access is difficult, and a written estimate with deck repair priced per sheet. No obligation.
More on Shingle Roofing
- Cool-Rated Shingles and Ventura County Attic Heat — Before You CommitShingle Roofing
- Cool-Rated Shingles and LA Attic Heat — Materials ComparedShingle Roofing
- Laying Over vs Tearing Off: The Honest AnswerShingle Roofing
- Ventilation: The Leak That Is Not a Leak — What to ExpectShingle Roofing