Solar Panel Roof Leak: Causes, Costs and Fixes (2026 Guide)

By Justen Pressler | 2026-05-15

If your roof is leaking after solar panel installation, the problem is almost always caused by improper flashing, poor mounting penetration seals, or a contractor who did not understand roofing before they started drilling into your roof. Solar roof leaks are one of the most common and most preventable roofing problems we see across Rocklin, Roseville, Lincoln, Auburn, Granite Bay, and Loomis. As a GAF Master Elite certified roofing and solar contractor with over 25 years of experience in Placer County, Pressler Home Performance has repaired hundreds of solar roof leaks caused by other companies and has developed installation methods that prevent these failures from happening in the first place.

This is not a minor issue. A solar panel roof leak left unaddressed can cause thousands of dollars in structural damage, mold growth, and ruined insulation. The longer you wait, the worse it gets. If you suspect your solar panels are causing a roof leak, contact us immediately for a free inspection.

Quick Answer Summary

• Solar roof leaks are caused by improper roof penetrations. Every solar panel mounting bracket requires lag bolts drilled directly into your roof deck
• Most solar companies are not roofing companies. They install panels but do not understand waterproofing, flashing, or underlayment
• Placer County weather accelerates solar leak damage. Summer heat expands sealants, winter storms exploit every gap
• The fix requires a roofing contractor, not a solar company. Repairing a solar roof leak means removing panels, repairing the roof system, and reinstalling correctly
• Prevention is the best strategy. Hiring a contractor licensed in both roofing and solar eliminates the risk entirely

Do Solar Panels Cause Roof Leaks?

Yes. Solar panels themselves do not leak, but the mounting hardware does. Every panel is bolted to your roof with lag screws drilled through the shingles, underlayment, and into the rafters. A typical home installation creates 20 to 40 roof penetrations. When those penetrations are not flashed and sealed by a qualified roofing contractor, water finds its way in. The leak is almost never the panel. It is the hole under the panel.

Solar Roof Leak Causes, Symptoms, Cost and Who Fixes It

Before and After: Solar Roof Leak Repair in Rocklin

Before. Cracked sealant blobs around the lag bolts, water staining streaking down the shingles, and a lifted flashing piece. This is what a failed solar penetration looks like on a Placer County roof after a few summers of thermal cycling.

After. New aluminum flashing boots woven into fresh architectural shingles at every lag bolt. Dry, clean, and built to last through the next 20 years of Rocklin summers and atmospheric rivers.

Why Solar Roof Leaks Happen

Every solar panel system installed on a residential roof requires physical attachment to the roof structure. This means drilling lag bolts through your roofing material, through the underlayment, and into the roof rafters or decking. A typical residential solar installation in Placer County involves 20 to 40 individual roof penetrations. Each one of those penetrations is a potential leak point if not properly sealed and flashed.

The problem is straightforward: most solar installation companies are electrical contractors, not roofing contractors. They understand inverters, wiring, and panel efficiency. They do not understand roof systems, water management, flashing details, or the behavior of roofing materials under thermal cycling. When an electrician drills 30 holes in your roof and relies on a tube of caulk to keep water out, you have a ticking clock.

At Pressler Home Performance, we hold both roofing and solar licenses under CSLB #1085722. We approach every solar installation as a roofing project first and a solar project second. That distinction is critical and it is the single biggest reason our solar installations do not leak.

Common Causes of Roof Leaks After Solar Installation

Improper Lag Bolt Sealing

The most frequent cause of solar roof leaks is improper sealing around the lag bolts that attach racking to the roof. Many installers apply a bead of silicone or polyurethane sealant around the bolt and call it done. In Placer County's climate, where summer temperatures exceed 100°F and winter storms bring driving rain, that sealant degrades within 3 to 5 years. It cracks, shrinks, and pulls away from the shingle surface, creating a direct path for water into your roof deck.

Missing or Incorrect Flashing

Professional roofing contractors use aluminum or galvanized steel flashing around every roof penetration. Solar-only installers frequently skip this step or use inadequate flashing that does not integrate properly with the surrounding shingle courses. Flashing must be woven into the existing shingle pattern, not just laid on top. If the flashing sits on top of a shingle rather than underneath the course above it, water will channel directly under the flashing and into the penetration.

Damaged Underlayment

When solar installers walk on your roof, drag equipment across the surface, and position panels, they can damage the underlayment beneath your shingles without realizing it. Synthetic underlayment is more durable than traditional felt paper, but it can still tear under heavy foot traffic. Once the underlayment is compromised, even a well-sealed penetration can allow water migration through the damaged area.

Cracked or Broken Shingles

Solar installers working on older roofs frequently crack shingles during installation without noticing. In Rocklin and Roseville, where roofs endure years of extreme heat, shingles become brittle and prone to cracking. An installer stepping on a brittle shingle near a panel mount can create a crack that channels water directly to the penetration point. A qualified roofing contractor inspects every shingle in the work area before and after installation.

Improper Conduit Routing

Solar systems require electrical conduit routed from the panels to the inverter, which often involves additional roof penetrations for conduit entry points. These secondary penetrations are frequently overlooked during waterproofing. A conduit boot that is not properly sealed or a conduit run that creates a water dam on the roof surface can cause leaks that appear far from the solar panels themselves.

How Placer County Weather Makes Solar Leaks Worse

Summer Heat Expansion and Contraction

Placer County summers are brutal on roofing materials. When roof surface temperatures reach 150°F or higher on a 105°F day in Rocklin or Roseville, every material on your roof expands. Metal racking expands at a different rate than asphalt shingles, which expand at a different rate than the lag bolt sealant. This differential thermal movement creates microscopic gaps at penetration points during the day. At night, everything contracts. Over hundreds of heating and cooling cycles each summer, those gaps widen until they allow water entry.

Winter Atmospheric Rivers

When winter storms hit Placer County, they often come as atmospheric river events that dump 2 to 4 inches of rain in 24 hours with sustained winds of 30 to 50 mph. This is not gentle rain. This is wind-driven water being pushed horizontally across your roof surface and into every gap, crack, and failed seal. A penetration that held up fine during a light spring rain will fail catastrophically during a December atmospheric river.

Temperature Cycling Year-Round

Even outside of extreme summer heat, Placer County experiences significant daily temperature swings. A typical spring day in Lincoln or Auburn might range from 45°F in the morning to 85°F in the afternoon. That 40-degree swing happens 200+ days per year and creates constant thermal stress on sealants and flashing. Cheap sealants used by discount solar installers simply cannot withstand this cycling.

Signs Your Solar Panels Are Causing a Roof Leak

Not every roof leak in a home with solar panels is caused by the solar installation. But if you notice any of the following signs, the solar system should be the first suspect:

• Water stains on ceilings or walls directly below solar panel locations. This is the most obvious indicator
• Musty smell in the attic. Trapped moisture from a slow leak creates mold growth that produces a distinctive odor
• Peeling paint or bubbling drywall. Water migrating through the roof deck causes the drywall below to absorb moisture
• Visible water in the attic around roof penetration points. If you can safely access your attic, look at the underside of the roof deck near where solar mounting bolts penetrate
• Increased humidity in rooms below the solar array. Even without visible water stains, a slow leak raises indoor humidity levels
• Dark spots or discoloration on roof shingles near panel mounts. Water pooling or channeling around poorly flashed penetrations stains the surrounding shingles

If you see any of these signs, do not wait. Water damage compounds quickly. What starts as a slow drip can become a full roof deck replacement if left for a season. Call us at (916) 367-8828 for an immediate inspection.

Solar Roof Leak Repair Cost Factors in Placer County

The cost to repair a solar roof leak depends on several factors:

Extent of Damage

A leak caught early may require only resealing and reflashing a few penetration points, which typically costs $500 to $1,500. A leak that has been active for months or years may require roof deck replacement, new underlayment, shingle replacement, and possibly mold remediation, which can range from $3,000 to $15,000 or more.

Panel Removal and Reinstallation

To properly repair a solar roof leak, the panels in the affected area must be removed, the roof repaired, and the panels reinstalled. Panel removal and reinstallation typically adds $1,000 to $3,000 depending on the number of panels and system complexity.

Roof Age and Condition

If your roof was already near the end of its lifespan when solar was installed, the repair may reveal that a full roof replacement is needed. In that case, it makes sense to replace the roof and reinstall the solar system with proper flashing from the start. A full roof replacement in Placer County typically costs $12,000 to $35,000.

Who Installed the Solar

Some solar companies offer workmanship warranties that cover leak repairs. However, many of the solar companies that were installing panels aggressively in 2020 through 2023 are no longer in business. If your solar installer is gone, you need an independent roofing contractor to handle the repair.

Why You Need a Roofing Contractor, Not a Solar Company, to Fix a Solar Roof Leak

This is a point we cannot stress enough. When your roof leaks because of a solar installation, the problem is a roofing problem. It requires a roofing solution. Sending the solar company back to apply more caulk is not a solution. It is a temporary patch that will fail again.

A qualified roofing contractor will:

• Remove the affected solar panels and racking
• Inspect the roof deck for water damage and rot
• Replace any damaged decking, underlayment, or shingles
• Install proper flashing at every penetration point using roofing-grade materials
• Reinstall the solar panels with correct waterproofing procedures
• Verify the repair with a water test before closing up

A solar company will typically apply sealant over the existing failed sealant and hope it holds. We see this over and over in Granite Bay, Loomis, and across Placer County. The homeowner calls the solar company, they send someone to caulk it, and six months later the leak is back, often worse than before.

How Pressler Home Performance Prevents Solar Roof Leaks

We prevent solar roof leaks because we are a roofing company first. Every solar installation we perform follows our roofing standards, not just solar industry standards. Here is what that means in practice:

Pre-Installation Roof Assessment

Before we install a single panel, we perform a complete roof inspection. If the roof is nearing the end of its lifespan, we recommend replacing it before installing solar. This saves the homeowner from paying for panel removal and reinstallation a few years down the road. If the roof is in good condition, we document its current state so any future issues can be accurately diagnosed.

Engineered Flashing at Every Penetration

We use GAF-approved flashing methods at every lag bolt location. Each penetration gets a dedicated aluminum flashing boot that is woven into the surrounding shingle courses, sealed with roofing-grade sealant, and inspected before the panel is mounted. This is the same standard we apply to pipe boots, vents, and chimney flashings on a new roof installation.

Proper Sealant Selection

Not all sealants are appropriate for roof penetrations. We use polyether-based sealants rated for roofing applications that maintain flexibility through Placer County's extreme temperature range. These sealants are rated for a 20+ year lifespan, compared to the 3 to 5 year lifespan of standard silicone used by many solar installers.

Crew Training and Supervision

Our installation crews are trained in both roofing and solar. They understand how to walk a roof without damaging shingles, how to handle underlayment, and how to identify pre-existing conditions that need attention before panels go on. Every installation is supervised by a crew lead with roofing experience.

Solar Roof Leak Repair Across Placer County

We provide solar roof leak inspection, repair, and prevention services across all of Placer County, including:

• Rocklin: Whitney Ranch, Stanford Ranch, Sunset West, and all Rocklin neighborhoods
• Roseville: West Roseville, Sun City, Fiddyment, Highland Reserve
• Granite Bay: Custom home solar leak repair across Granite Bay
• Auburn: Auburn, North Auburn, and the Highway 49 corridor

We also serve homeowners across Sacramento County including Folsom and the surrounding region. See our full service area for every community we cover.

Frequently Asked Questions

Can solar panels cause roof leaks?

Yes. Solar panels themselves do not leak, but the mounting hardware requires drilling lag bolts through your roof. If those penetrations are not properly flashed and sealed by a qualified roofing contractor, they will leak. This is the number one cause of solar roof leaks in Placer County and across California.

How do I know if my solar panels are causing my roof to leak?

Look for water stains on ceilings directly below where solar panels are mounted, musty odors in the attic, or visible moisture on the underside of the roof deck near mounting bolt locations. If your leak started after solar installation or worsened during rain, the solar penetrations are the most likely source.

Should I call my solar company or a roofer to fix a solar roof leak?

Call a roofing contractor. Solar roof leaks are roofing problems that require roofing solutions. Most solar companies will apply additional sealant as a temporary fix, but the underlying flashing and waterproofing failures need to be addressed by a licensed roofing professional. Pressler Home Performance is licensed in both roofing and solar.

How much does it cost to fix a solar roof leak in Rocklin?

Minor solar roof leak repairs in Rocklin typically cost $500 to $1,500 if caught early. If the leak has caused deck damage, mold, or structural issues, repairs can range from $3,000 to $15,000. Panel removal and reinstallation adds $1,000 to $3,000. Contact us for a free estimate.

Can I file a claim against my solar installer for roof damage?

If your solar installer is still in business and their workmanship caused the leak, you may have a warranty claim or legal recourse. Check your installation contract for workmanship warranty terms. You can also file a complaint with the California Contractors State License Board if the installer was licensed. Many solar companies that installed aggressively in recent years are no longer operating.

Does homeowners insurance cover solar roof leak damage?

Most homeowners insurance policies cover sudden and accidental water damage but may not cover damage caused by faulty workmanship or gradual leaks. If the leak is traced to improper installation by a third party, your insurance company may pursue the solar installer's insurance. Document all damage thoroughly and contact your insurance agent promptly.

How long does solar roof leak repair take?

A straightforward solar roof leak repair, including panel removal, flashing repair, and panel reinstallation, typically takes 1 to 2 days. If extensive roof deck replacement or mold remediation is needed, the project may take 3 to 5 days. We provide detailed timelines in our free estimates.

Will fixing a solar roof leak void my solar warranty?

No. Repairing the roof beneath your solar panels does not void the panel manufacturer's product warranty. However, if panels need to be removed and reinstalled, the work should be performed by a qualified solar contractor to maintain equipment warranty coverage. Because Pressler Home Performance handles both roofing and solar, your warranties remain intact throughout the repair.

Is it better to replace my roof before installing solar?

If your roof is more than 15 years old or showing signs of wear, yes. Replacing the roof before solar installation eliminates the risk of having to remove and reinstall panels when the roof eventually needs replacement. It also allows proper flashing and waterproofing to be integrated from the start. This is the approach we recommend to homeowners in Rocklin, Roseville, and throughout Placer County.

What is the best way to prevent solar roof leaks?

Hire a contractor who is licensed and experienced in both roofing and solar installation. The single biggest factor in preventing solar roof leaks is having a crew that understands roof waterproofing systems, not just electrical systems. Pressler Home Performance is GAF Master Elite certified and holds CSLB license #1085722 for both roofing and solar work.

Does Pressler Home Performance offer free solar roof leak inspections?

Yes. We provide complimentary solar roof leak inspections for homeowners in Rocklin, Roseville, Lincoln, Granite Bay, Loomis, Auburn, and throughout Placer County and Sacramento County. Schedule your free inspection today.

About Pressler Home Performance

Pressler Home Performance is a California-licensed, full-service roofing and construction company based in Rocklin, CA. We specialize in:

• Roofing: GAF Master Elite certified roofing installations, replacements, and repairs
• Solar and Electrical: Solar installation, solar roof leak repair, and electrical services
• Custom Home Building: Custom home builder in Rocklin delivering ground-up residential construction
• ADU Construction: ADU builder in Rocklin handling design, permits, and construction
• Barndominiums: Barndominium builder in California with steel-framed living expertise
• Red Iron Steel Buildings: Red iron steel buildings in California for every application
• Siding and Exterior Painting: Siding contractor and exterior painting in Rocklin
• Concrete and Landscaping: Concrete contractor in Rocklin for all flatwork and hardscaping

We serve Rocklin, Roseville, Lincoln, Granite Bay, Loomis, Auburn, all of Placer County, and Sacramento County.

About the Author

Justen Pressler is the founder of Pressler Home Performance and a California licensed contractor (CSLB #1085722) with over 25 years of experience in roofing, solar installation, and residential construction serving Rocklin, Roseville, and Placer County. As one of the few contractors in the region licensed in both roofing and solar, Justen has firsthand expertise in diagnosing and preventing solar roof leaks. His hands-on approach and commitment to doing things the right way have made Pressler Home Performance the most trusted name in local construction.

Ready to Get Started?

If you have a solar roof leak, suspect your solar panels are causing water damage, or want to install solar the right way the first time, Pressler Home Performance is here to help. We serve homeowners across Rocklin, Roseville, Lincoln, Granite Bay, Loomis, Auburn, and all of Placer County and Sacramento County.

Call us today at (916) 367-8828 or request a free consultation online. No pressure, no gimmicks. Just honest work from a contractor who lives in your community and understands both your roof and your solar system.

Related Pressler services

• Roof leak repair under solar panels for panel removal, leak repair and watertight reinstall
• Roof repair for leaks away from the array
• Roof inspection for a documented condition report