● CSLB C-39 #1084729 · Licensed & Insured Serving Dublin, CA 94568 ☎ (925) 644-8514
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Roof Leak Detection & Second Opinions in Dublin, CA

Some leaks don’t give up their source easily. The roof looks fine, another roofer patched something, and the stain comes back with the next storm. HomeGuard Roofing finds hard-to-trace leaks by testing the roof one section at a time until we can show you exactly where the water gets in. Then we tell you what it will take to fix it.

Call (925) 644-8514 or call to schedule a leak detection visit.

☎ Call (925) 644-8514 When You Need It
  • ✓ CSLB C-39 #1084729
  • ✓ 5-Year Warranty on Repairs
  • ★ 4.9 from 132 Dublin-Area Reviews
  • CSLB license #1084729, C-39 Roofing
  • Written findings with photos and video
  • Detection fee credited toward the repair if we do the work Fee amount to confirm before launch

When You Need Leak Detection, Not Just a Repair

Leak detection is a separate step from repair. It makes sense when:

  • A roofer has already repaired the roof and it still leaks
  • The roof is new or recently replaced and started leaking anyway
  • The stain is in a spot with no obvious roof feature above it
  • The leak only appears in certain storms or certain wind directions
  • More than one roofer has given you different answers
  • There’s a mix of roofing types, such as a flat section meeting a shingle or tile roof
  • You’ve been told you need a whole new roof and you want a second opinion first

Why Some Leaks Are So Hard to Find

Water can enter at one point, run along the top of the underlayment or the roof deck, and come through somewhere else entirely. On a two-story Dublin home with stucco walls, it can also get in behind the wall and show up on a ceiling, so the roof gets blamed for a wall problem.

The hardest leaks usually involve:

  • Transitions: where a flat roof meets a sloped one, or a roof meets a wall
  • Raised curbs: skylights and rooftop equipment sitting on boxes that need their own flashing
  • Multiple penetrations close together: vent pipes, B-vents for furnaces, solar mounts
  • Wind-driven water: leaks that only happen when rain comes from one direction
  • New roofs with installation errors: flashing not tied into the new roofing, or old flashing reused when it shouldn’t have been

Is It Even the Roof?

Before we test the roof, we rule out the things that often get mistaken for roof leaks:

  • Air-conditioner condensation. Many Dublin homes have furnace and AC equipment in the attic. A clogged condensate line or a rusted drain pan can drip onto a ceiling on hot summer days, with no rain at all.
  • Plumbing. Supply lines to upstairs bathrooms, or a vent pipe with a failed joint, can leak above a ceiling.
  • Windows and walls. A leaking upstairs window or cracked stucco can send water down inside a wall to the ceiling below.
  • Attic condensation. Poor ventilation can let moisture condense on the underside of the roof deck on cold nights, then drip.

Does it leak when it hasn’t rained?

If yes, the roof is probably not the cause. Note when the stain grows: after rain, during hot afternoons, or when someone showers upstairs. That one detail can save you money on the wrong repair.

How We Find the Leak

  1. History first. When it leaks, during which storms, what’s been repaired, and copies of any earlier quotes or photos.
  2. Attic inspection. We follow water trails, stained wood and damp insulation, and mark the areas they lead to.
  3. Roof inspection. We check every feature above the suspect area: flashing, curbs, penetrations, seams, valleys, drains and the roof-to-wall joints.
  4. Isolated water testing. On a dry day, we run water over one small section of roof at a time, starting low and working uphill, while someone watches inside. When the leak appears, we know which section caused it. We don’t move on to the next section until we’ve given the current one enough time.
  5. Confirm and document. We open the roofing at that spot if needed and photograph the failed part.
  6. Written findings and a repair plan. You get the cause, photos, and an itemized repair quote. If you want, you can use the findings with your original roofer or their warranty.

Why water testing beats guessing

Guessing usually means replacing whatever looks worst and hoping. Isolated testing takes longer, but it proves the source. On roofs that have already been “fixed” more than once, that proof is what finally stops the leak.

Leaks on New Roofs

A new roof shouldn’t leak, but it happens, usually at flashings and transitions rather than in the middle of the roofing. If your roof is new:

  • Call the installer first and give them a chance to fix it under their workmanship warranty.
  • Document everything: dates it leaked, photos of stains, and copies of your contract and warranty.
  • Ask for a second opinion if the installer’s fixes aren’t working. Our written findings can show what’s wrong without accusing anyone.
  • Check the contractor’s license at cslb.ca.gov. The Contractors State License Board is also where California homeowners can file a complaint if a licensed contractor won’t correct defective work.

What if my new roof was installed by a builder?

Many homes in Wallis Ranch, Jordan Ranch and other newer East Dublin communities are still within a builder’s warranty period. Check your warranty documents before paying for repairs. Our report can help you make the claim.

Second Opinions Before You Replace

If you’ve been told you need a whole new roof and you’re not convinced, a second opinion is worth it. We’ll check whether:

  • The leak comes from one fixable spot or many failures
  • The roof covering still has life left
  • On a tile roof, a lift and relay could replace the underlayment and keep your tiles
  • The decking is sound

If replacement really is the right answer, we’ll say so and show you why. If it isn’t, you’ll have the photos to back that up.

Leak Detection Cost in Dublin

Fee varies To be confirmed

Leak detection is priced separately from the repair because it takes time. Time on the roof, the number of suspect areas, roof height and access all affect the price.

If we do the repair, the detection fee is credited toward it.

Typical Leak Detection Jobs in Dublin

Tile Roof “Repaired” Twice, Still Leaking

The situation: A two-story East Dublin home with a concrete tile roof. A prior contractor replaced broken tiles twice, but a stain over the family room kept coming back.

What testing typically shows: The tiles weren’t the problem. Water was running down a sidewall where the roof meets the second story and getting behind the stucco, at a joint with no kickout flashing and worn step flashing beneath the tile.

The result: Flashing rebuilt along the wall, with a kickout added. No new tile roof needed.

Leak Near the Furnace Flue

The situation: A drip near a hallway light fixture, mostly in winter.

What testing typically shows: Water entering where the B-vent for the attic furnace passes through the roof. The storm collar and flashing had separated.

The result: New flashing and storm collar, sealed and tested.

For a flat-roof example, see the Downtown Dublin case study on our homepage.

What Dublin Homeowners Say

“Another company couldn’t find our leak after two visits. These folks did a water test, found it at a vent pipe in under an hour, and credited the detection fee toward the repair. Impressive.”

Jennifer L.San Ramon Village · Leak detection & second opinion

Roof Leak Detection FAQs

They work from the inside out: trace water in the attic, check every roof feature above it, and then test sections of the roof with water one at a time while someone watches inside. The section that triggers the leak is the source.

It depends on how many areas are suspect. A single area can take an hour or two. Several areas can take most of a day. We test on a dry day so we can see new water clearly.

Contact the installer first and document the leak with dates and photos. If their fixes don’t work, a second opinion with written findings helps you get it resolved. You can check the contractor’s license and file a complaint with the CSLB if needed.

Yes, if your AC equipment is in the attic. A clogged condensate line or a rusted drain pan can drip on hot days with no rain. If the stain grows when it’s dry, check the AC first.

Yes. If the leak comes from one fixable spot and the roof has life left, we’ll recommend the repair and show you the evidence.

Yes. We step only where tiles are supported and lift tiles carefully when we need to see underneath. Any tile that cracks during inspection is replaced.

Get a Straight Answer About Your Leak

If you’re tired of the same stain coming back, let’s find the real cause. Call HomeGuard Roofing at (925) 644-8514 or call to schedule leak detection. Once we’ve found it, our roof leak repair team can fix it.

☎ (925) 644-8514
☎ Call (925) 644-8514
☎ Call (925) 644-8514