Maui Roofs & Repairs

CALL OR TEXT (808) 219-0300
CALL OR TEXT (808) 219-0300

MAUI'S #1 ROOFING CONTRACTOR

Roof Waterproofing in Maui, HI

Reliable Roof Waterproofing in Maui for Long-Term Protection

Maui Roofs & Repairs is the roof waterproofing contractor in Maui, Hawaii that homeowners, commercial property owners, and associations have trusted since 2007. In a place where tropical rainfall, persistent humidity, salt-laden ocean air, and intense UV exposure work on your building every single day, waterproofing isn’t an optional upgrade — it’s the foundation of a roof that actually does its job. Whether you need a full waterproofing system on a flat commercial roof in Kahului, a fluid-applied coating on a low-slope structure in Kihei, or membrane waterproofing on a custom home in Wailea, our team brings the expertise and materials to deliver lasting moisture protection designed specifically for Maui’s demanding climate.

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CRAFTSMANSHIP BACKED BY DECADES OF EXPERIENCE

WE DO COMPLETE ROOFING SOLUTIONS Specializing in roof repairs, roof replacements, new roof installations, commercial roofing, waterproofing, roof leak detection, roof inspections, hotel & condo roofing, AOAO & HOA roofing, re-roofing, and residential roofing — for every structure on Maui.

For over 20 years, Maui Roofs & Repairs has set the standard in roofing solutions across the island. Our team of seasoned professionals combines technical expertise with a deep understanding of Hawaii’s climate and terrain, ensuring every roof we install stands the test of time. From the windy north shores of Haiku to the sun-baked slopes of Kula, we design solutions that thrive in Maui’s diverse conditions.
  • 20+ Years Maui Experience
  • Satisfaction Guaranteed
  • Licensed, Bonded & Insured
  • Free Estimates & Roof Consultations
  • Climate-Resistant Solutions Delivered On Time

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Why Roof Waterproofing Matters More in Maui Than Almost Anywhere Else

Maui receives some of the highest rainfall totals in the United States. Certain areas of the island, particularly the north shore and Upcountry communities like Haiku and Kula, see well over 100 inches of rain per year. Even South Maui and West Maui, which are considerably drier, experience intense and sudden rainfall events that put roofing systems under immediate pressure. When a roof’s waterproofing layer is compromised, water doesn’t announce itself politely. It finds every gap, every failed seam, every corroded flashing, and every dried-out sealant point. It moves laterally along structural members before it ever appears inside the building, which means the visible damage is often much smaller than the actual moisture intrusion that’s already occurred. By the time a water stain appears on a ceiling, the roof deck, insulation, and sometimes even framing may already have absorbed moisture for weeks or months. Beyond rainfall, Maui’s combination of salt air humidity and UV radiation accelerates the breakdown of standard waterproofing materials faster than in mainland climates. Products that might last 20 years in a cooler, drier environment can see their effective lifespan cut significantly in Hawaii’s conditions. This is why selecting the right waterproofing system and applying it correctly is so consequential for Maui properties, and why working with a contractor who genuinely understands these conditions makes all the difference.

Signs Your Roof Needs Waterproofing Attention

Waterproofing failures don’t always present as obvious leaks. Here are the signs that your roof’s moisture protection system needs professional evaluation:

  • Water stains, discoloration, or wet spots on interior ceilings or walls
  • Mold, mildew, or musty odors in your attic, upper floors, or enclosed ceiling spaces
  • Blistering, bubbling, or lifting on your roof membrane or coating surface
  • Visible cracks, splits, or open seams on flat or low-slope roof surfaces
  • Deteriorated, cracked, or missing sealant around flashings, vents, skylights, or HVAC units
  • Standing water that remains on flat roof surfaces long after rainfall has stopped
  • Soft spots or spongy areas when walking on a flat roof surface
  • Rust staining or corrosion around metal roof penetrations or edge details
  • A flat or low-slope roof that is more than 10 to 15 years old without a recent coating or resurfacing
  • Previous repairs that have failed or are showing signs of wear

Any one of these warrants a professional assessment. Several of them together indicate that your roof’s waterproofing system needs immediate attention before the moisture intrusion progresses further into the building structure.

Our Roof Waterproofing Services in Maui, HI

We provide a full range of roof waterproofing solutions for residential and commercial properties across Maui. Every system we install is selected for performance in Hawaii’s specific climate conditions, and every application is backed by the workmanship standards that have made us the island’s most trusted roofing contractor.

Fluid-Applied Silicone Roof Coatings

Silicone roof coatings are one of the most effective waterproofing solutions available for flat and low-slope roofs, and they are particularly well-suited to Maui’s climate. A fluid-applied silicone system is sprayed or rolled directly onto the existing roof surface, filling all seams, penetrations, and minor surface imperfections to create a fully seamless, monolithic waterproof membrane. Unlike patching or lap-seam systems, there are no joints or seams in a silicone coating application, which means there are no weak points for water to exploit.

Silicone performs exceptionally well under UV exposure, maintaining its flexibility and adhesion even after years of Hawaii’s intense sun. It also handles standing water better than most other coating types, which is important for flat roofs that don’t drain perfectly after heavy rain. For commercial and residential property owners in Maui who have a structurally sound flat roof that needs restored waterproof protection, silicone coating is often the most cost-effective solution available, delivering like-new moisture protection without the cost of a full tear-off and replacement.

TPO & PVC Membrane Waterproofing Systems

Thermoplastic membrane systems, including TPO and PVC, are among the strongest waterproofing solutions available for flat and low-slope commercial roofs in Maui. These single-ply membranes are heat-welded at all seams, creating a continuous, fully bonded waterproof surface that resists punctures, UV degradation, and chemical exposure. TPO membranes also carry high reflectivity ratings, which helps reduce roof surface temperatures and lower interior cooling costs in Maui’s warm climate.

We install TPO and PVC membrane systems for new commercial roofs, full waterproofing upgrades on existing structures, and replacement of failed flat roof systems. Seam welding quality is the single most important factor in the long-term performance of a membrane system, and our installation crew brings the precision and experience to get it right on every project.

Modified Bitumen Waterproofing

Modified bitumen systems provide a proven, multi-layer waterproofing solution for flat and low-slope roofs. These systems consist of reinforced bitumen sheets applied in overlapping layers, creating a highly durable waterproof assembly that handles the mechanical stresses of thermal expansion and contraction in Maui’s climate. We install both torch-applied and cold-adhesive modified bitumen systems depending on the building type and application requirements. Modified bitumen remains a reliable choice for commercial and industrial properties where a robust, multi-layer waterproofing system is the priority.

Waterproof Roof Deck & Flat Surface Systems

Many properties across Maui have horizontal surfaces that serve double duty as both structural elements and usable spaces. Rooftop decks, walkways above occupied spaces, planter boxes, mechanical equipment pads, and similar surfaces require dedicated waterproofing systems that can handle both foot traffic and persistent moisture exposure. Standard roofing materials are not designed for these applications. We install purpose-built waterproofing membranes and deck coating systems for these surfaces, delivering reliable moisture protection that performs under physical use without compromising the structural elements beneath.

Penetration and Flashing Waterproofing

Every point where something passes through or meets your roof surface is a potential water entry point. HVAC units, plumbing vents, electrical conduits, skylights, parapets, and wall-to-roof transitions all require careful waterproofing detailing to remain watertight over time. This is one of the most common failure points on Maui roofs, particularly as sealants age and flashings corrode in the salt air environment. Our penetration and flashing waterproofing service addresses these vulnerable points with properly specified materials and installation techniques, including custom-fabricated flashing from our in-house sheet metal shop for a precise, durable seal at every transition.

Roof Sealing and Re-Sealing Services

For roofs that are otherwise in good condition but showing signs of sealant deterioration around penetrations, edges, and transitions, a targeted re-sealing service can restore waterproof protection without the cost of a full coating or membrane installation. We use roofing-grade sealants rated for UV exposure and thermal movement in Hawaii’s climate, applied correctly to the prepared surfaces for maximum adhesion and long-term performance. This service is particularly valuable as a proactive maintenance measure for Maui commercial properties and older residential roofs.

Waterproofing for New Roof Installations

Every new roof installation we complete is built with full waterproofing integrity from the substrate up. That means properly lapped and sealed synthetic underlayment across the entire deck, custom-fabricated flashing at every penetration and transition, correctly installed drip edge and starter details, and roofing material installed to manufacturer specifications for full weather resistance. Waterproofing a new roof is not a separate service add-on — it’s integrated into every new installation we do, because a roof that isn’t fully waterproof from day one is a roof that’s already failing.

Emergency Waterproofing in Maui

When a roof fails suddenly from storm damage, a fallen tree, or a catastrophic membrane tear, immediate waterproofing action is needed to stop water from penetrating further into the building structure. Our emergency waterproofing service in Maui is available 24 hours a day, 7 days a week, every day of the year. We respond quickly to tarp, seal, and stabilize damaged roof areas to prevent further moisture intrusion while a permanent repair or replacement solution is arranged. Call (808) 219-0300 any time for emergency response.

Waterproofing Solutions for Every Roof Type in Maui

Different roofing systems require different waterproofing approaches, and our team is experienced across all of them.

  • Flat and Low-Slope Roofs: These systems are the most waterproofing-intensive because they lack the slope to shed water quickly. Standing water, seam failures, and membrane deterioration are common failure points. We install silicone coatings, TPO and PVC membranes, modified bitumen, and built-up systems for flat roof waterproofing across Maui’s commercial and residential properties.
  • Tile Roofs: Tile itself is not a waterproof material. The waterproofing layer on a tile roof lives in the underlayment beneath the tile surface. When that underlayment deteriorates, water passes directly through the tile to the structure below. We assess, repair, and replace underlayment systems on tile roofs and re-seal flashing and mortar details that are showing signs of water infiltration.
  • Metal Roofs: Metal roofing systems are highly durable, but their waterproofing depends on seam integrity, fastener seals, and corrosion-resistant coatings. Salt air in coastal Maui locations accelerates degradation of exposed fasteners and lap seams over time. We re-seal metal roof seams, replace compromised fasteners, apply protective coatings, and address any corrosion points to restore full waterproof performance.
  • Shingle Roofs: Asphalt shingle systems rely on correctly lapped shingle layers, intact underlayment, and properly sealed flashings for their waterproofing integrity. When any of those elements fail, water infiltration follows. We address shingle waterproofing failures through targeted repairs, flashing re-sealing, underlayment replacement in affected areas, and full underlayment replacement where needed.
  • Roof Decks and Horizontal Surfaces: Rooftop decks, balconies above occupied spaces, and other horizontal surfaces above living or working areas require purpose-built waterproofing systems. We install traffic-rated waterproofing membranes and coating systems for these applications across residential and commercial properties throughout Maui.

Our Roof Waterproofing Process

We approach every waterproofing project with a thorough, documented process that identifies the actual problem, delivers the right solution, and verifies the result before we consider the job complete.

  1. Roof and Surface Assessment: We conduct a detailed on-site inspection of the roof surface, substrate, drainage, flashings, and all penetrations. We identify current waterproofing failures, areas of concern, and any underlying structural issues that need to be addressed before waterproofing work begins.
  2. Honest Recommendation: Based on the assessment, we give you a clear recommendation for the most appropriate waterproofing solution. That might be a targeted re-seal, a fluid-applied coating, a new membrane system, or underlayment replacement. We explain what each option delivers and what it costs so you can make an informed decision.
  3. Surface Preparation: Proper surface preparation is the single most important factor in how well a waterproofing system performs and how long it lasts. We clean, prime, and prepare all surfaces according to the requirements of the specific system being applied. Existing failures, blisters, and deteriorated material are addressed before any new waterproofing product goes on.
  4. Waterproofing Application: Our experienced crew applies the chosen waterproofing system according to manufacturer specifications, paying particular attention to critical details at penetrations, flashings, drains, and edges. All flashing work uses custom-fabricated pieces from our in-house sheet metal shop where applicable.
  5. Inspection and Leak Verification: Once the waterproofing application is complete, we conduct a thorough inspection of the treated surfaces before considering the work finished. We verify that all critical areas are properly sealed and that the system has been applied correctly throughout.
  6. Written Documentation: You receive a written record of all work performed, materials used, and warranty information. For commercial properties and association-managed buildings, we provide the documentation needed for your records and any insurance or warranty purposes.

ENHANCE YOUR PROPERTY TO THE HIGHEST STANDARDS

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808-219-0300

Roof Waterproofing for Residential and Commercial Properties in Maui

We provide roof waterproofing services for every property type across the island. For homeowners, moisture intrusion is one of the most damaging and disruptive problems a property can experience. A properly waterproofed roof protects your home’s structure, your interior finishes, your belongings, and your family’s health from the mold and air quality issues that moisture damage can bring. Our residential waterproofing work covers everything from targeted flashing re-seals on older tile roofs to complete silicone coating systems on flat-roofed contemporary homes. For commercial property owners, condominium associations, AOAO boards, and hotel operators, roof waterproofing failures carry operational and financial consequences that go well beyond the cost of the repair itself. Water intrusion into a commercial building can affect multiple tenants, damage equipment and inventory, trigger liability concerns, and generate insurance claims that affect future coverage costs. Our commercial waterproofing capabilities in Maui cover every building type and every roofing system, and we bring the project management experience to handle large-scale waterproofing work with minimal disruption to operations.

Roof Waterproofing and Insurance Claims in Maui

Sudden waterproofing failures caused by storm damage, wind events, or other covered incidents may qualify for insurance coverage. Our team helps Maui property owners document waterproofing damage thoroughly and navigate the insurance claim process from start to finish. We assist with photographic evidence, damage assessment documentation, adjuster coordination, and maximum payout advocacy. If your roof has suffered weather-related waterproofing damage, contact us before filing your claim so we can make sure everything is properly documented from day one.

Why Maui Property Owners Choose Maui Roofs & Repairs for Waterproofing

From our base in Wailuku, we provide roof waterproofing services throughout the entire island of Maui:

  • Kahului & Wailuku — Central Maui residential and commercial properties
  • Lahaina & Kaanapali — West Maui coastal homes and hospitality properties
  • Kapalua & Napili — North West Maui resort and residential buildings
  • Kihei & Wailea — South Maui high-end residential, commercial, and condominium properties
  • Upcountry Maui — Kula, Makawao, Pukalani homes and structures in high-rainfall elevations
  • Paia & Haiku — North Shore Maui properties in one of the island’s wettest corridors
  • Maalaea — Central-West commercial and residential buildings

Waterproofing requirements vary meaningfully across the island. Properties on the north shore in Paia and Haiku face among the highest annual rainfall totals on Maui, making waterproofing system integrity particularly critical. Coastal properties in Kihei, Wailea, and Lahaina deal with salt air exposure that accelerates the degradation of sealants, coatings, and metal components. Upcountry properties face sustained moisture from cloud cover and frequent rain at higher elevations. Our 18+ years of island-wide work mean we bring location-specific knowledge to every waterproofing project we take on.

READY FOR PROFESSIONAL ROOFING SOLUTIONS?

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Frequently Asked Questions About
Roof Waterproofing in Maui

What is the difference between a roof coating and a roof waterproofing membrane?
A roof coating, such as a fluid-applied silicone system, is applied as a liquid that cures into a continuous waterproof film over an existing roof surface. A waterproofing membrane, such as TPO or PVC, is a manufactured sheet material that is mechanically fastened, fully adhered, or ballasted to the roof deck. Both deliver effective waterproofing when correctly specified and installed, but the right choice depends on your roof’s current condition, slope, substrate, and long-term performance requirements. We assess each situation individually and recommend the appropriate system.
How long does a silicone roof coating last in Maui?
A properly applied silicone roof coating on a well-prepared surface in Maui’s climate can last 10 to 20 years depending on the product specification, coating thickness, and the UV exposure at your specific location. Silicone performs particularly well in high UV environments compared to other coating types, which makes it a strong choice for Maui properties. We use coating systems that are specifically rated for Hawaii’s climate conditions.
Can you waterproof a roof that is already leaking?
Yes, but the source of the leak needs to be identified and the underlying cause addressed before new waterproofing is applied. Applying a coating or membrane over an active leak without addressing the cause is a temporary patch at best. Our process starts with a thorough assessment to find the actual failure points, and we repair them correctly before any new waterproofing system goes on.
Is roof waterproofing the same as roof coating?
They are closely related but not identical. Roof coating typically refers to a fluid-applied product applied over an existing surface for waterproofing and UV protection. Waterproofing is a broader term that encompasses all systems and materials used to prevent moisture penetration, including coatings, membranes, flashings, sealants, and underlayments. A complete waterproofing approach addresses all of these elements together, not just the surface coating.
How often should a commercial flat roof be waterproofed or recoated in Maui?
For most commercial flat roofs in Maui, a professional waterproofing assessment every five years is a reasonable baseline. Many coating systems are designed to be recoated at the 10 to 15 year mark to restore their waterproof performance without a full tear-off. The right schedule depends on the specific system, its age, and the conditions at your property. We can assess your commercial roof and give you a clear recommendation for the right maintenance and recoating timeline.
Do you waterproof roofs on condominiums and AOAO-managed buildings?
Yes. We have extensive experience working with condominium associations and AOAO-managed buildings across Maui. We understand the approval processes, documentation requirements, and stakeholder communication that association projects involve, and we manage all of it as part of our service.
What is the best waterproofing system for a flat commercial roof in Maui?
It depends on the current condition of your roof, the substrate type, your drainage situation, and your budget. Silicone coating is an excellent choice for structurally sound flat roofs needing restored surface waterproofing. TPO and PVC membranes are the right call for full waterproofing system replacements on commercial buildings. Modified bitumen is a strong option where a multi-layer, mechanically robust system is needed. We assess each roof individually and recommend what genuinely fits best.
How do I get started?
Call us at (808) 219-0300 or visit mauiroofing.com to schedule your free roof waterproofing assessment. We’ll inspect your roof, identify any current or developing waterproofing issues, and provide a complete written proposal at no cost and no obligation.

Protect Your Property From the Inside Out

Maui Roofs & Repairs has been waterproofing roofs across Maui, Hawaii since 2007. We bring 18+ years of island-specific experience, a full range of waterproofing systems, in-house sheet metal fabrication, and a commitment to honest, quality work on every project. We're fully licensed, bonded, and insured, and we back every waterproofing project with a 100% workmanship guarantee.

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808-219-0300
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