Skylight Leak Repair Alhambra CA done right the first time

Skylight Leak Repair Alhambra CA starts with finding the real entry point, not guessing at the glass. We inspect the curb, flashing, sealant, and roof deck around every unit, then repair the failure so water stops reaching your ceiling. If you have been searching for skylight leak fixing in Alhambra, we handle both the roof-side repair and the interior water damage trail it leaves behind.

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Local Roof Repair team in Alhambra
  • Cracked sealant
  • Rusted flashing
  • Ceiling stains
  • Written scope firstYou see the estimate before we start
  • Photos of the problemWe show you what we found
  • Clean work areaWe haul away all debris
  • Test before we leaveWater test confirms the fix

What our Skylight Leak Repair includes

Every skylight repair starts with a full inspection and ends with a water test. Here is what is covered in a standard repair and what we handle separately if the damage goes further than the roof.

  • Full leak inspectionWe inspect the skylight curb, flashing, sealant joints, and surrounding roof field. An infrared thermal imaging camera and moisture meter confirm how far water has traveled, so the repair covers the full extent of the problem, not just the visible entry point.
  • Flashing and curb repairWe reset or rebuild the step flashing and curb flashing around the skylight, replacing rusted or bent metal. Laps go back in the correct order so water sheds off the unit instead of working under it. This is the core of most skylight leak repairs.
  • Underlayment replacementDamaged underlayment under the flashing gets replaced with Grace or a matching product. Skipping this step is why so many skylight patches fail within a year. New underlayment gives the flashing a sound surface to seal against.
  • Sealant and roof cementWe remove failed sealant, clean the surface, and apply new product rated for your roof material. Henry roof cement and DAP sealant go where they belong. We do not just caulk over a crack and call it fixed.
  • Water test and documentationBefore we leave, we flood the repaired area with a hose and watch from inside. You get photos of the repair and a note on what failed. If a drop gets through, we are still on the roof until it does not.
Skylight Leak Repair

Skylight repair for homes

We repair skylights on houses, bungalows, and two-story homes across Alhambra. You get the roof-side failure fixed and a clear answer on any interior water damage.

  • Ceiling stains under the skylight
  • Cracked sealant at the curb
  • Rusted or bent flashing
  • Leaks that only show in heavy rain

Skylight repair for businesses

We repair skylights on commercial buildings and mixed-use properties without disrupting your tenants. Work is scheduled around business hours and building access.

  • RetailFlat roof skylights repaired around store hours
  • OfficesCurb and membrane repairs with minimal noise
  • WarehouseLarge skylight units resealed and water-tested
  • Mixed-useResidential and commercial skylights on one roof

Skylight Leak Repair Alhambra CA: what the work involves

Skylight Leak Repair Alhambra CA is the process of locating and sealing the exact point where water enters around a skylight, then restoring the roof assembly so it sheds water again. Most leaks do not come through the glass. They come through the curb, the step flashing, cracked sealant, or a failed underlayment lap. We pull the surrounding shingles or membrane back, check the framing for rot, and rebuild the waterproofing layers in the correct order.

In Alhambra, skylights sit on roofs that bake through long dry summers and then take concentrated rain between November and March. That swing dries out sealant, shrinks flashing laps, and opens gaps you never see from the ground. If you have been hunting for skylight leak fixing near me Alhambra and watching a brown ring spread across your ceiling, the source is usually a curb detail that failed quietly months ago.

Find where the water actually enters, fix that detail, then prove it with a water test.

How our skylight leak repair process runs

Five steps, no surprises. You know what we found, what we are doing, and what it costs before we start swinging a hammer.

  1. Roof inspection

    Roof inspection

    We set a roof ladder and walk the area around the skylight, checking the curb, flashing, sealant joints, and the shingles or membrane uphill of the unit. A moisture meter and infrared thermal imaging camera confirm how far the water has traveled. This usually takes 30 to 45 minutes on a single-story home.

  2. Leak diagnosis

    Leak diagnosis

    We run controlled water over the skylight in stages, starting low and working up, so we can see exactly where it enters. You get a plain explanation of the failure: failed flashing lap, cracked sealant, rusted curb, or a nail popped through the underlayment. No guesswork, no parts swapped hoping it helps.

  3. Repair and reseal

    Repair and reseal

    We lift the surrounding roofing, replace damaged underlayment, reset or rebuild the flashing, and reseal the curb with the right product for your roof type. A pry bar, caulking gun, and utility knife do most of the work. A typical skylight reseal and flashing repair runs two to four hours.

  4. Water test

    Water test

    Before we pack up, we flood the repaired area with a hose and watch it from inside the attic or from below. If a single drop gets through, we are still on the roof. This step is why our skylight repairs do not come back as repeat calls the next time it rains.

  5. Cleanup and walkthrough

    Cleanup and walkthrough

    We clear every nail, shingle scrap, and tube of sealant, then walk you through what failed and what we did. You get photos of the repair and a note on what to watch over the next rainy season. If interior drywall needs patching, we tell you what to expect.

Tools and methods we use on skylight leaks

  • Infrared thermal imaging camera

    Shows temperature differences that reveal where water sits under the roof surface, so we can trace a skylight leak to its full extent before we open anything up.

  • Moisture meter

    Confirms how wet the decking, insulation, and drywall are around the skylight. Readings tell us whether the damage is surface-level or has soaked deeper into the assembly.

  • Roof ladder and fall protection

    Gets us safely onto steep-slope and two-story roofs. OSHA safety certification covers the setup, so the inspection and repair happen without risk to the crew or your roof.

  • Pry bar and utility knife

    Lifts shingles and membrane cleanly around the skylight so we can access the flashing and underlayment without tearing up the surrounding roof field.

  • Caulking gun and sealant

    Applies Henry roof cement and DAP sealant in controlled beads at the curb joints and flashing edges. The right product for the roof material is what makes the seal last.

  • Hose and water test kit

    Floods the repaired area in stages so we can watch for leaks from inside. This is the step that proves the repair works before we leave the roof.

  • Tarp and fasteners

    Covers an active skylight leak during a storm to stop water intrusion immediately. The tarp stays until the roof is dry enough for the permanent repair.

  • Staged water testing

    We run water over the skylight starting low and working up, one section at a time. This isolates the exact failure point instead of soaking the whole area and guessing. It is the most reliable way to diagnose an intermittent skylight leak.

When to call for skylight leak repair

  • You notice a water stain on the ceiling right below the skylight after the first big storm of the season.

    We inspect the skylight curb, flashing, and surrounding roof, trace the leak with a moisture meter, and repair the failure. If the drywall is wet, we tell you what to watch for as it dries. The leak stops, the stain stops spreading, and you know whether the drywall needs patching or just drying time.

  • Your skylight has been patched twice by someone else and still leaks every winter.

    We open the repair area, find what the previous patches missed, and rebuild the flashing and underlayment correctly. Most repeat skylight leaks come down to a flashing lap that was never reset. A repair that holds through the rainy season, with photos of what was actually wrong.

  • A storm is pushing water through the skylight right now and you need it stopped today.

    We tarp the skylight and surrounding roof to stop the intrusion, then schedule the permanent repair once the weather clears and the roof is safe to walk. The water stops, your ceiling and insulation are protected, and the permanent fix is on the calendar.

  • You are buying or selling a home in Alhambra and the inspection flagged the skylight as a leak risk.

    We inspect the skylight, document its condition with photos, and repair any active failure. If the unit is sound, we tell you that too, so you are not paying for work you do not need. A clear answer on the skylight condition, with repair documentation you can pass to the other side of the transaction.

  • Your skylight is on a flat roof section and water pools around the curb after every rain.

    We repair the membrane around the skylight, reseal the curb termination, and check the drainage path so water moves off the roof instead of sitting at the unit. The ponding stops working into the skylight detail, and the flat roof section drains the way it should.

How Skylight Leak Repair runs in Alhambra

Alhambra roofs take a beating from dry heat and then concentrated winter rain. That cycle dries out sealant, shrinks flashing laps, and opens gaps around skylights that you never see until water shows up inside. Most of the homes we work on were built between the 1920s and the 1960s, with original framing and roof pitches that were not designed for modern skylight units. We see a lot of clay tile and asphalt shingle roofs, plus flat membrane sections on commercial buildings along Valley Boulevard. When you call for affordable Skylight Leak Repair Alhambra CA, we inspect the unit, trace the leak with a moisture meter, and repair the failure with materials matched to your roof. We work across Los Angeles County and know the local building stock, so we are not guessing at what is under the shingles.

  • Alhambra Park areaOlder single-family homes with original roof framing and skylights added during remodels. Flashing details here often do not match the original roof assembly.
  • Main Street corridorA mix of residential and small commercial buildings. Flat membrane sections with skylights are common, and curb terminations are a frequent leak point.
  • Valley BoulevardCommercial blocks with flat roofs and multiple skylights. Repairs here need to work around tenant hours and building access.
  • Ramona Road areaHomes with steeper roof pitches and clay tile. Skylight repairs here require careful tile handling to avoid breakage.
  • Marengo AvenueA mix of older bungalows and newer builds. We see both original curb-mount skylights and factory-built units with different flashing needs.
  • Long dry summers followed by concentrated winter rainSealant dries and shrinks through the summer, then the first heavy rain finds the gap. Most skylight leaks we repair show up in the first two storms of the season.

From problem to finished result.

  • Rusted curb flashing on a 1950s bungalow

    Before

    A homeowner near Alhambra Park had a ceiling stain spreading under a skylight for two months. Two previous attempts had sealed the glass, which was not the problem. The curb flashing had rusted through, and water was running straight into the roof deck.

    After

    We replaced the rusted flashing with new metal, replaced the wet underlayment, and resealed the curb. The water test ran clean on the first pass. The ceiling stain stopped spreading, and the homeowner patched the drywall two weeks later.

    Check the curb flashing and sealant each fall before the rainy season. A five-minute look from the roof can catch a failing seal before it becomes a ceiling leak.

  • TPO membrane skylight on a Valley Boulevard building

    Before

    A commercial building had water dripping into a tenant space from a skylight on a flat TPO roof. The membrane around the curb had separated at a seam, and water was getting under the membrane and running along the deck.

    After

    We repaired the TPO membrane around the skylight, re-welded the seam, and resealed the curb termination. The tenant space stayed dry through the next storm. The repair took one day and did not disrupt building operations.

    Have the flat roof inspected each spring for seam separation and ponding. Catching a lifted seam early prevents water from getting under the membrane.

  • Intermittent leak on a clay tile roof

    Before

    A Monterey Park homeowner only saw the leak during heavy rain, so it was hard to catch. The skylight looked fine from the ground. We used a thermal camera and found water entering at a shingle lap uphill, running sideways, and showing up at the skylight.

    After

    We repaired the actual failure uphill, checked the skylight while we were on the roof, and water-tested both areas. The leak stopped, and the homeowner avoided replacing a skylight that was never the problem.

    After any heavy storm, look for lifted or cracked tiles near the skylight. A quick visual check can catch a small failure before it becomes a ceiling leak.

Skylight leak problems we solve in Alhambra

Skylight leaks show up in different ways, and each one points to a different failure. Here are the problems we see most often and how we fix them.

  • Ceiling stain spreading under the skylight

    Ceiling stain spreading under the skylight

    We trace the water to the skylight curb or flashing, repair the roof-side failure, and water-test it. Then we advise on the interior drywall and insulation so the damage does not spread or come back. Water soaking drywall and insulation feeds mold within 24 to 48 hours and can rot the framing above the ceiling.

  • Skylight leaks only during heavy rain

    Skylight leaks only during heavy rain

    We run controlled water over the skylight in stages to reproduce the leak on demand. That lets us pinpoint the exact failure and repair it, instead of sealing everything and hoping. Intermittent leaks are the hardest to catch, and they quietly saturate the attic between storms without showing a stain until damage is advanced.

  • Old sealant cracked around the skylight

    Old sealant cracked around the skylight

    We remove the failed sealant completely, clean and prep the surface, and apply new product rated for your roof material. We also check the flashing underneath, because cracked sealant often hides a bigger flashing problem. Cracked sealant lets water straight into the curb joint, and the leak gets worse every season as the crack widens.

  • Water pooling at a flat-roof skylight

    Water pooling at a flat-roof skylight

    We repair the membrane around the skylight, reseal the curb termination, and check the drainage path so water moves off the roof instead of sitting at the unit. Ponding water at the skylight curb works into seams and terminations, and it can eventually find its way into the building.

  • Rusted or bent skylight flashing

    Rusted or bent skylight flashing

    We replace the damaged flashing with new metal, reset the laps, and replace any underlayment that got wet. The repair restores the waterproofing layers in the correct order so the skylight sheds water again. Rusted flashing loses its seal and lets water under the shingles, which can rot the roof deck around the skylight.

A skylight repair that holds through the next rainy season.

  • Leak traced to source

    We use an infrared thermal imaging camera and a moisture meter to follow the water path instead of guessing. That means we repair the actual entry point, not the stain on your ceiling. Most misdiagnosed skylight leaks we reopen were sealed at the glass while the real gap sat at the curb flashing.

  • Dry ceiling, no mold

    Water that reaches drywall or attic insulation starts feeding mold within about 24 to 48 hours. We stop the intrusion, then check the surrounding decking and insulation for saturation. Catching it early keeps a $300 repair from turning into a $3,000 drywall and insulation replacement.

  • Correct materials for the roof

    We match the repair to what is already up there: asphalt shingles, clay tiles, slate tiles, or a TPO membrane on a flat section. Henry roof cement, DAP sealant, and Grace underlayment go on where they belong. Wrong sealant on the wrong surface is why so many skylight patches fail in under a year.

  • Same-day emergency response

    When a storm is pushing water through your skylight, we can tarp the area and stop the damage before the full repair. Emergency Skylight Leak Repair Alhambra CA calls get priority, and we schedule the permanent fix as soon as the roof is safe to walk.

What you receive

Clear records you can keep and share.

Written scope

What failed and what we will repair

Repair photos

Before and after images of the work

Water test result

Confirmation the repair holds before we leave

What to know about skylight leaks

Most skylight leaks do not come through the glass. They come through the curb, flashing, or sealant around the unit. Knowing where to look saves you from replacing a skylight that was never the problem.

  • Glass is rarely the cause

    Skylight glass is tough and rarely fails. The leak almost always starts at the curb, flashing, or sealant joint. Sealing the glass is the most common wasted repair we see.

  • Intermittent leaks are diagnosable

    A leak that only shows in heavy rain can still be reproduced with staged water testing. We run water over the unit in sections until the entry point shows itself.

  • Water travels sideways

    Water entering uphill of a skylight can run along the deck and drip at the skylight. The stain location is not always the leak location, which is why we trace the full path.

Local service area

Roof repair coverage around Alhambra

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Frequently Asked Questions

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Get your Skylight Leak Repair Alhambra CA scheduled today

Water through a skylight gets worse with every storm. Call us, and we will inspect the unit, trace the leak, and give you a straight price before we start. State-licensed roofing contractor serving Alhambra and Los Angeles County.

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Contact Roof Repair Alhambra Pros

Call us at (626) 640-8498 or email info@roofrepairalhambrapros.com. We answer the phone during business hours and respond to emergency calls after hours. Same-day estimates are available for most jobs in Alhambra and surrounding areas.

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