7 Signs of a Bad Roofing Job in Los Angeles
A bad roofing job shows up fast in LA. Exposed nails, sloppy flashing, and skipped permits are three of seven signs to catch before winter rain.
A bad roofing job does not always leak the first week. It sits quietly through the dry LA summer and then shows its problems when the first real rain hits in November. By then the crew is gone and the deposit is spent.
You do not need to be a roofer to catch a bad install. Most of the warning signs are visible from the ground or a ladder. Here are seven signs of a bad roofing job that LA homeowners run into, and what each one is telling you about the work underneath.
1. Exposed or Overdriven Nails
Walk the perimeter and look up at the roof edge. You should not see nail heads sitting out in the open on the shingle surface. Exposed nails are entry points for water, and under LA’s intense UV they corrode and back out over time.
Overdriven nails are the opposite problem. When a nail gun is set too high, it punches through the shingle and crushes it. That shingle no longer holds. A rushed crew getting paid by the square tends to make both mistakes.
2. Sloppy or Missing Flashing
Flashing is the metal that seals the spots where your roof meets something else. Chimneys, skylights, wall lines, and valleys all need it. Bad crews skip it, reuse old rusted pieces, or hide gaps with a smear of caulk.
Caulk is not flashing. It dries out and cracks within a couple of Santa Ana wind seasons. If you see roofing tar or sealant where clean metal should be, the roof flashing was done wrong. Those spots leak first when the rain comes.
3. Shingles That Do Not Line Up
Step back across the street and look at the roof as a whole. Good shingle rows run straight and even. Bad ones wander, with crooked lines, uneven gaps, and patches that do not match.
Crooked shingles are more than an eyesore. Misaligned courses leave the seams under each shingle exposed instead of covered by the row above. That breaks the water shedding pattern the whole roof depends on.
4. No Permit and No Final Inspection
A full reroof in Los Angeles requires a permit. The city or county sends an inspector to check the work before the job is signed off. Crews that skip the permit are skipping that outside check on purpose.
No permit also means trouble later. When you sell, an unpermitted roof can stall the deal or force you to redo the work. It can also void material warranties and complicate an insurance claim. Before you hire anyone, read our guide on how to choose a roofing contractor in LA so you know what to confirm up front.
5. Reused or Missing Underlayment
Underlayment is the waterproof layer between your shingles and the wood deck. On a proper tear-off, the old underlayment comes off and new synthetic or felt goes down. A cheap crew lays new shingles right over the old, brittle layer to save time and material.
You cannot always see this from outside, but there are tells. If the job finished in a single short day on a full-size roof, or the dumpster looks nearly empty, ask what came off. A proper roof replacement includes fresh underlayment across the whole deck.
6. Nails and Debris Left in Your Yard
The cleanup tells you how the crew treats details. A good roofer runs a magnetic sweep across your yard, driveway, and flower beds to pull stray nails. A bad one leaves them behind for your tires and bare feet to find.
Piles of shingle scrap, torn wrapper, and old flashing left in the side yard point to the same rushed attitude. Crews that cut corners on cleanup usually cut them on the roof too.
7. Sagging or Uneven Rooflines After the Job
Sight down the ridge and the eaves after the work is done. The lines should be straight. New dips, waves, or humps that were not there before mean something underneath is wrong.
Sagging after a fresh install can mean rotted decking was covered instead of replaced, or too many layers were stacked in an overlay. In older Valley ranch homes this shows up fast. A sag is a structural warning, not a cosmetic one, and it does not fix itself.
What to Do If You Spot These Signs
Do not confront the crew and expect a straight answer. Document everything first. Take clear photos from the ground and, if you can do it safely, from a ladder at the edge.
Next, get an independent set of eyes on it. A professional roof inspection from a contractor who did not do the original work gives you an honest report on what was done wrong and what it will take to fix. That report is also what you need if you end up filing a complaint with the state licensing board or pushing the original crew to come back.
Repair or Redo: When Does Each Make Sense
Not every bad job needs a full redo. If the problems are limited to a few flashing points or a section of misdriven nails, targeted repairs can bring the roof back to sound condition for a fraction of the cost.
The line moves when the underlayment was skipped or the decking was covered wet. At that point you are patching over a bad foundation, and a full tear-off is the honest answer. Our breakdown of roof repair versus replacement walks through where that line usually falls and what each path costs.
Frequently Asked Questions
How do I know if my roof was installed correctly?
Look for straight shingle lines, clean metal flashing at every joint, and no exposed nails. Ask for the permit and the signed final inspection. If the contractor pulled a permit and passed inspection, an outside official already checked the work.
Can a bad roofing job be fixed without a full replacement?
Often yes. Isolated problems like poor flashing, exposed nails, or a crooked section can be corrected with targeted repairs. A full redo is only needed when the underlayment was skipped or bad decking was covered instead of replaced.
Who is responsible for a bad roof installation?
The contractor who did the work is responsible under their workmanship warranty. If they refuse to fix it, a licensed roofer’s inspection report and your photos support a complaint to the Contractors State License Board and any insurance or small claims action.
How long before a bad roofing job starts leaking?
It varies. Many bad installs hold through the dry LA summer and start leaking with the first heavy rain in November through March. Flashing and nail problems usually show up first once water and Santa Ana winds test the weak points.
Should I get a second opinion before hiring a roofer?
Yes. Getting two or three written, itemized estimates helps you spot lowball bids that skip underlayment or permits. A price far below the rest usually means corners are already planned into the job.
A bad roofing job is easier to catch than most people think, and catching it early is the difference between a quick repair and tearing off a roof twice. If any of these signs look familiar, get an independent inspection before the rainy season puts them to the test.
Call Best LA Roofing at (818) 446-6122 for a free roof inspection and an honest read on the work you already paid for.