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Common roof problems

Roof leaks: causes, what to check, and how they are fixed

A ceiling stain or a drip in the rain almost always traces to a small, findable failure. We locate the real source and close it.

Where leaks start

  • Failed flashing at chimney, walls, and valleys
  • Slipped, cracked, or missing tiles
  • Worn underlayment beneath the tile
  • Clogged valleys and backed-up water
Get it traced
The problem

A leak is a symptom, not the whole story

The frustrating thing about a roof leak is that where it shows inside is rarely where it starts outside. Water enters at a gap in the roof, runs along the underside of the deck or down a rafter, and drips through the ceiling several feet from its real source. That is why chasing the stain instead of the source leads to repairs that do not hold.

In Los Angeles, the usual culprits are failed flashing at the chimney, walls, and valleys, slipped or cracked tiles, and, on tile roofs, underlayment that has aged out beneath tile that still looks fine. Clogged valleys and gutters that back water up under the roof edge are another frequent cause, especially in a heavy rain. The good news is that most leaks come from one of a handful of spots, so a proper diagnosis finds them.

We approach a leak by finding its true origin first, through leak detection, then closing it with a lasting roof repair. If the cause is the flashing, our flashing repair handles it, and if it is worn underlayment across a wide area, a reroof is the honest fix.

Signs you have a roof leak

  • Ceiling or wall stains that spread after rain
  • A musty smell or damp attic
  • Peeling paint or bubbled drywall
  • Dripping during or after a storm
  • Stained or matted attic insulation
Do not let it spread

A leak only gets more expensive with time

We find the source and close it before it reaches the wood. Call (310) 806-5959 or request an estimate.

What to check

How to read the leak before we arrive

1

When does it drip?

Only in heavy rain points to flashing or valleys. With no rain at all points to condensation, plumbing, or HVAC, as our no-rain leak page covers.

2

Where does it show?

Near a chimney or skylight points to flashing. A note of the spot inside helps us trace back to the source outside.

3

How bad is it?

An active pour or a bulging ceiling is urgent, as our is it an emergency page explains. A slow drip can wait a few days.

4

Any recent event?

A storm or fallen branch points to storm damage, which may be an insurance matter.

How we fix it

  • Trace the leak to its true source, not the stain
  • Reset or replace slipped and cracked tiles
  • Reflash the chimney, walls, and valleys properly
  • Replace failed underlayment where needed
  • Clear valleys and drainage so water can leave
The fix

Close the source, protect the wood

Once the source is found, the repair is straightforward: reset or replace the failed tiles, reflash the joints properly rather than smear on more caulk, and replace any underlayment that has aged out at that spot. If water has already reached the decking, that gets addressed too, before the new work goes on.

The reason to move on a leak is simple. Left alone, it keeps soaking the same wood, and a small gap becomes rot, ruined insulation, and stained drywall, as our page on delaying a repair lays out. It can also invite mold, covered on our roof leak and mold page. Catching it early keeps the fix small. A written roof inspection confirms the extent so nothing is missed.

Roof leak FAQ

Common questions

Water travels along the deck and rafters before it drips, so the stain inside is often feet away from where the water actually enters the roof. That is why we trace the source rather than patch the ceiling.
On tile, the underlayment beneath is the real barrier, and it wears out before the tile. A tile roof can leak with perfectly good-looking tile because the felt underneath has aged out.
We can protect the inside and stop active water, but a lasting repair is best done on a dry roof. For an active emergency, see our emergency repair page.
By reading the pattern, checking the likely paths, and testing suspect areas. Most leaks come from a short list of spots, so a methodical check finds them.
Request an estimate

Get that leak handled

Tell us what your roof is doing. We find the source and give you a written price, with no obligation.

Call us direct(310) 806-5959

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