Flat Roof Replacement & GAF TPO Roofing in Santa Clara and San Mateo Counties

Professional Flat Roof Replacement, Eichler Roofing, and Energy-Efficient TPO Systems

Home Pro Roofing and Solar provides flat roof replacement and low-slope roofing services for homeowners and qualifying small commercial properties throughout Santa Clara and San Mateo Counties.

Based in Sunnyvale, California, we specialize in replacing aging flat roofs with modern GAF EverGuard TPO roofing systems, including standard 60-mil membranes and available 80-mil upgrades.

Whether you own an Eichler home in Palo Alto, a mid-century modern home in Mountain View, a low-slope property in Redwood City, or a house with an aging flat roof in Sunnyvale, we can help you evaluate the right roofing solution.

Our flat roof replacement services include roof tear-off, roof decking evaluation, TPO membrane installation, tapered insulation, drainage improvements, flashing, and coordination of existing solar panel removal and reinstallation.

Home Pro Roofing and Solar is a woman-owned roofing and solar contractor serving local homeowners since 2006, operating under Professional Home Improvement, Inc. DBA Home Pro Roofing and Solar.

We hold California Contractor License # 1050229.

Need to replace your flat roof?

Request a Free Flat Roof Replacement Estimate or call (800) 650-3134.

Flat Roof Replacement Requires a Different Roofing System

Flat roofs are common throughout the Peninsula and South Bay, particularly on Eichler homes, mid-century modern houses, contemporary residences, additions, and some small commercial buildings.

Although these roofs are called flat, they should have enough slope and drainage to move rainwater off the roofing surface.

Unlike traditional pitched roofs, which rely on overlapping shingles to shed water, flat and low-slope roofs need a continuous waterproof roofing system.

When rainwater moves slowly across a roof, seams, flashing, penetrations, and drainage details become especially important.

A properly designed flat roofing system must address:

• A continuous waterproof roofing membrane

• Securely joined and sealed membrane seams

• Appropriate slope and positive roof drainage

• Proper flashing at walls, roof edges, skylights, and penetrations

• A sound roof deck and suitable attachment system

• Insulation and applicable California energy requirements

• Compatible installation details for existing or future solar equipment

Home Pro evaluates these components when planning a flat roof replacement.

Our goal is to install a complete roofing assembly that protects your property, improves drainage where feasible, and addresses the specific conditions of your roof.

GAF EverGuard TPO Roofing: Our Preferred Flat Roof System

For many residential and qualifying small commercial flat roofs, Home Pro recommends GAF EverGuard TPO roofing.

TPO stands for thermoplastic polyolefin.

It is a single-ply roofing membrane designed for low-slope roof applications. The membrane is installed in sheets, with adjoining seams joined using controlled hot-air welding equipment.

The result is a continuous roofing surface designed to resist water intrusion and withstand outdoor exposure.

GAF EverGuard TPO is particularly well suited for many Bay Area homes because it combines waterproofing performance, reflective roofing options, and compatibility with modern insulation systems.

Benefits of GAF EverGuard TPO Roofing

Heat-Welded Seams

TPO membrane seams are joined through hot-air welding rather than relying only on adhesives or seam tape.

Proper welding helps create strong, watertight connections between membrane sheets.

Reflective Roofing Surface

White TPO roofing reflects a significant portion of incoming sunlight.

This can reduce roof surface temperatures and may help lower cooling demand, depending on the home's insulation, ventilation, climate, and existing roof construction.

Lightweight Roofing Material

TPO is generally lighter than traditional multi-layer built-up roofing systems.

This can be useful when replacing older tar-and-gravel roofs, although the structural condition and design of the underlying roof must still be evaluated.

Compatible With Added Insulation

GAF EverGuard TPO can be incorporated into roofing assemblies with rigid insulation boards and tapered insulation.

This allows the roof replacement project to address both waterproofing and thermal performance.

Suitable for Residential Flat Roofs

TPO is often a practical option for Eichler homes, modern residences, flat-roof additions, and other low-slope structures.

Designed for Long-Term Performance

With appropriate installation, drainage, inspections, and maintenance, TPO can provide many years of service. Actual service life depends on the roofing assembly, environmental conditions, workmanship, and maintenance.

Mechanically Attached TPO Roofing

Home Pro commonly installs mechanically attached GAF EverGuard TPO systems when they are appropriate for the roof design.

With this method, approved fasteners and plates secure the membrane assembly to a suitable substrate according to the specified attachment pattern.

The seams are then hot-air welded to create the waterproof roofing surface.

Not every roof should use the same attachment method.

Deck construction, wind requirements, insulation, roof geometry, and manufacturer specifications determine whether a mechanically attached or another approved system is appropriate.

We evaluate these factors before recommending the roofing assembly.

GAF EverGuard TPO: 60-Mil vs. 80-Mil Roofing

Home Pro offers GAF EverGuard TPO roofing with different membrane thickness options.

A mil is one-thousandth of an inch. It measures membrane thickness, not the thickness of the entire roof assembly.

GAF EverGuard TPO 60-Mil

Our standard TPO option for many projects is GAF EverGuard TPO 60-mil.

This membrane provides a practical balance of material thickness, waterproofing performance, and cost.

For many residential flat roof replacements in Sunnyvale, Mountain View, Palo Alto, Redwood City, and surrounding communities, 60-mil TPO is a suitable choice when installed as part of a properly designed roofing system.

GAF EverGuard TPO 80-Mil

We can also offer GAF EverGuard TPO 80-mil for homeowners who want a thicker membrane.

Compared with 60-mil TPO, the 80-mil option provides additional overall membrane thickness.

It may be worth considering for projects where increased membrane robustness is a priority.

However, thickness alone does not determine roof performance or lifespan. Roof drainage, insulation, flashing, seams, attachment, and proper installation remain essential.

Which TPO Thickness Should You Choose?

We evaluate your roof and explain the available options before preparing a proposal.

Flat Roof Replacement for Eichler and Mid-Century Modern Homes

Eichler homes are an important part of the architectural history of Santa Clara and San Mateo Counties.

Many Eichler and other mid-century modern homes feature low rooflines, exposed wood beams, tongue-and-groove ceilings, large windows, and flat or low-slope roof assemblies.

These design features make the homes distinctive, but they also create special considerations when the roof needs replacement.

Home Pro provides flat roof replacement services for Eichler and similar mid-century modern homes throughout communities such as Palo Alto, Mountain View, Sunnyvale, Menlo Park, Redwood City, San Mateo, and nearby Santa Clara and San Mateo County communities.

Replacing Aging Tar-and-Gravel Eichler Roofs

Many older Eichler homes were built with traditional built-up roofing systems, sometimes referred to as tar-and-gravel roofs.

As these systems age, homeowners may experience leaks, deteriorating flashing, failed patches, or recurring water accumulation.

Replacing an older built-up roof with a properly designed TPO system can provide a modern waterproof membrane while maintaining the home's low-profile architectural appearance.

The new roofing assembly must still be designed around the existing roof deck, roof-edge heights, drainage, and structural conditions.

Protecting Exposed Beams and Wood Decking

Unlike many conventional houses, some Eichler homes have exposed interior roof decking and structural beams without a traditional attic.

This means roofing work may take place directly above finished interior ceiling surfaces.

Home Pro evaluates the existing roof construction before recommending replacement details.

Special attention may be needed around:

• Exposed wood ceilings and tongue-and-groove decking
• Existing roof sheathing or structural deck boards
• Roof edges and fascia details
• Skylights and roof penetrations
• Drainage outlets and gutters
• Insulation thickness and roof height transitions
• Mechanical equipment and solar panel attachments

If deteriorated wood is discovered during tear-off, we document the condition and explain the recommended repairs before proceeding with additional work.

Improving Eichler Roof Insulation

Some original Eichler roof assemblies have limited insulation compared with modern construction standards.

This can contribute to uncomfortable indoor temperatures during hot summer afternoons and cooler winter nights.

A roof replacement provides an opportunity to evaluate adding rigid insulation above the existing roof deck.

However, insulation thickness must be coordinated with roof-edge heights, drainage slopes, flashing, and applicable building energy requirements.

For some homes, a combination of flat and tapered insulation may help improve thermal performance while directing rainwater toward the intended drainage points.

The recommended insulation assembly depends on the home's existing construction and project requirements.

Own an Eichler or mid-century modern home with an aging roof?

Schedule a Flat Roof Assessment and ask about GAF TPO roofing and insulation options.

Tapered ISO Insulation and Flat Roof Drainage

Proper drainage is one of the most important parts of a successful flat roof replacement.

A flat roof should be designed to move water toward drains, scuppers, or gutters rather than allowing unnecessary water accumulation.

Where the existing roof has inadequate slope, tapered insulation may provide a practical solution.

What Is Tapered ISO Insulation?

ISO is short for polyisocyanurate, a type of rigid foam insulation commonly used in roofing assemblies.

Tapered ISO insulation boards are manufactured with varying thicknesses.

When installed in a planned layout, the boards create gradual slopes that help direct water toward drainage locations.

Depending on the roof, tapered insulation may be used to:

• Improve drainage toward existing outlets
• Reduce certain low spots where water collects
• Create drainage paths around rooftop equipment
• Improve the roof's overall insulation value
• Support a modern TPO roofing assembly

Why Standing Water Matters

Water that remains on a roof after rain is commonly called ponding water.

Some temporary water accumulation can occur on low-slope roofs, but persistent ponding deserves attention.

Potential concerns include increased loading, accumulated debris, accelerated deterioration of certain roofing components, and additional stress around seams or flashing details.

A new membrane by itself does not necessarily correct an underlying drainage problem.

That is why Home Pro evaluates the roof's drainage conditions when planning a replacement.

Can Tapered Insulation Fix Every Drainage Problem?

Not always.

Some drainage problems can be improved with tapered insulation, while others may require modifications to drains, scuppers, gutters, roof framing, or other parts of the assembly.

The available height at roof edges and wall flashings also limits how much insulation can be added.

Home Pro evaluates the roof geometry and explains the practical drainage options before selecting the system.

Energy-Efficient Flat Roofing and California Title 24

Energy performance is an important consideration when replacing a flat roof in California.

Home Pro evaluates reflective roofing materials and insulation requirements as part of the project planning process.

How Reflective TPO Roofing Helps

White GAF EverGuard TPO roofing can reflect more solar radiation than many dark roofing surfaces.

This can reduce the amount of heat absorbed by the roof.

The actual effect on indoor comfort and energy use varies by property, particularly with differences in insulation, building construction, cooling systems, and local weather.

A reflective roof is not a substitute for adequate insulation, but the two can work together as part of an energy-conscious roof replacement.

Adding Rigid Roof Insulation

Rigid polyisocyanurate insulation can be installed as part of a compatible TPO roofing assembly.

Insulation helps reduce heat transfer through the roof.

The insulation value depends on the product, thickness, temperature, and tested performance characteristics.

For older homes with limited existing insulation, adding roof insulation may provide a meaningful comfort improvement.

California Title 24 Roofing Requirements

California's Building Energy Efficiency Standards, commonly called Title 24, include requirements affecting certain roof replacements.

Depending on the property, these may include cool-roof performance standards and insulation requirements.

Applicable requirements depend on factors such as:

• Residential or commercial building classification
• Local climate zone
• Amount of roofing being replaced
• Existing roof insulation and construction
• Roof slope and assembly design
• Available compliance methods and exceptions
• Applicable code edition and local building department requirements

The California Energy Commission's Building Energy Efficiency Standards provide the statewide framework.

Home Pro reviews the applicable permit and energy requirements for the project and coordinates the proposed roofing materials and insulation accordingly.

We do not assume that every flat roof requires the same insulation thickness or that one roofing assembly is appropriate for every property.

Roof Decking, Flashing, and Penetrations

A TPO membrane is only one component of a complete flat roofing system.

The materials underneath the membrane and the details around roof openings are equally important.

Roof Deck Evaluation and Replacement

After removal of the existing roofing materials, we evaluate accessible portions of the underlying deck.

The deck may consist of plywood, oriented strand board (OSB), tongue-and-groove wood, or another approved substrate.

If we discover deteriorated, soft, damaged, or structurally unsuitable decking, the affected areas must be evaluated and appropriately addressed before the new roof assembly is installed.

Additional decking or structural repair work is documented and handled according to the project agreement.

Flashing at Roof Edges and Walls

Water intrusion often occurs at transitions rather than in the middle of an intact roofing membrane.

Critical areas include:

• Roof edges and perimeter metal
• Parapet walls and sidewalls
• Gutters, drains, and scuppers
• Skylights
• Plumbing vents
• Exhaust pipes
• Equipment curbs
• Solar mounting penetrations

Properly detailed flashings help connect the roof membrane to adjoining surfaces while maintaining the waterproofing system.

Roof Penetrations and Equipment

Flat roofs frequently have plumbing vents, mechanical equipment, skylights, and sometimes solar equipment.

Each penetration must be addressed using details compatible with the selected roofing system.

When existing equipment is removed or relocated, we evaluate the affected roof area and coordinate the necessary roofing work.

For solar-equipped roofs, the solar mounting system must also be compatible with the new roofing assembly.

Flat Roof Replacement With Existing Solar Panels

Many homeowners now have solar panels installed on flat or low-slope roofs.

When the roof needs replacement, existing solar equipment may need to be temporarily removed before roofing work can begin.

Home Pro Roofing and Solar provides solar panel removal and reinstallation services in connection with roof replacement projects.

This is an important advantage for homeowners who want their roofing and solar work coordinated rather than managing two unrelated project schedules.

How We Coordinate Flat Roof Replacement With Solar

1. Evaluate the Existing Solar System

We review the system configuration, approximate age, mounting method, and accessibility.

When appropriate and feasible, we arrange pre-removal system testing or performance documentation to establish the available operating baseline.

2. Plan the Removal

The solar equipment is disconnected and removed by appropriately qualified personnel.

Depending on the project, Home Pro may perform the applicable solar work directly or coordinate qualified solar specialists.

Existing panels and reusable components are handled and stored according to the project plan.

3. Replace the Flat Roof

With the affected roof areas accessible, Home Pro completes the contracted roof replacement.

This may include old roof removal, deck repairs, insulation, drainage details, and GAF EverGuard TPO installation.

4. Coordinate Solar Mounting Details

Before the solar array is reinstalled, the mounting approach is reviewed for compatibility with the new roof.

Solar attachments must account for structural loading, waterproofing, wind requirements, and the roofing manufacturer's installation requirements.

Some existing racking or mounting components may need replacement if they are damaged, obsolete, unsuitable, or incompatible with the new assembly.

5. Reinstall and Reconnect the Solar Equipment

Qualified personnel reinstall the approved solar equipment and complete the required electrical connections.

The work may require updated mounting details, permits, inspections, or additional electrical services depending on the existing system and local requirements.

6. Verify System Operation

Following reinstallation, the solar system is checked or commissioned as appropriate to confirm its operating status.

Performance comparisons must account for weather, seasonal production, equipment condition, and other operating factors.

What If Solar Equipment Needs Additional Work?

Older solar systems may have components that cannot be reused safely or are no longer compatible with current mounting requirements.

If we identify a concern involving existing racking, wiring, equipment, or roof attachments, we explain the recommended work and any associated cost before proceeding.

Solar equipment cleaning, replacement components, electrical upgrades, and other additional services are included only when specified in the project scope.

One Coordinated Roofing and Solar Project

Home Pro remains the primary customer-facing contractor for its roofing and solar relationship with the homeowner.

For qualifying projects, Home Pro performs the applicable solar work directly.

Other solar projects or programs may require an approved third-party solar installation company.

When a third-party installer performs the solar work, that company is responsible for its contracted solar installation activities and communicates directly with the homeowner about that work.

Home Pro coordinates the roofing portion and remains available to help address matters involving the overall Home Pro customer relationship.

Learn more about our Solar Panel Removal and Reinstallation Services.

Installing New Solar Panels on a Flat TPO Roof

If you are considering solar installation, it is worth evaluating the condition of your flat roof before the solar equipment is installed.

Installing new solar panels on a roof that may soon need replacement can create unnecessary future removal and reinstallation costs.

A roof replacement provides an opportunity to plan the roof and solar mounting system together.

Special Considerations for Flat Roof Solar

Unlike many pitched roofs, flat roof solar systems may require specially designed mounting arrangements.

Depending on the property, the installation may involve ballasted, mechanically attached, or other engineered mounting systems.

Important considerations include:

• Structural loading and roof condition
• Wind resistance
• Roof membrane compatibility
• Roof penetration and flashing requirements
• Solar panel positioning and tilt
• Maintenance access
• Drainage paths
• Local permitting and electrical requirements

The best mounting approach depends on the roof construction and the selected solar system.

Home Pro can help homeowners evaluate roofing needs in connection with new solar installation.

For new solar projects, Home Pro may perform certain installations directly or offer a program using an approved solar installation partner, such as Solar Tech or Axia by Qcells.

When a third-party solar installation company is required, that company is responsible for its solar design, applicable permitting, installation, inspections, commissioning, and contracted solar workmanship.

The homeowner communicates directly with that company about its solar work while Home Pro remains the customer-facing Home Pro relationship.

Learn more about our Solar Installation Services.

Our Flat Roof Replacement Process

Replacing a flat roof requires careful coordination between the roof structure, waterproofing system, insulation, drainage, and any rooftop equipment.

Home Pro follows a project-specific process to evaluate and complete the work.

1. Initial Roof Assessment

We review the roof's accessible condition, existing materials, approximate size, drainage, penetrations, and visible signs of deterioration.

We also discuss any history of leaks, standing water, or previous repairs.

2. Roofing System Recommendation

Based on the roof conditions and project requirements, we recommend an appropriate roofing assembly.

This may include GAF EverGuard TPO 60-mil or 80-mil, compatible insulation, tapered drainage design, and related roofing components.

3. Written Proposal

We provide a written proposal identifying the planned roofing work, selected materials, and relevant project details.

Any allowances, exclusions, or additional work considerations are explained.

4. Permitting and Project Coordination

Home Pro coordinates the roofing permit process when required.

If the project includes solar equipment, skylights, or other rooftop systems, we review the work that must be coordinated with the roofing schedule.

5. Removal of Existing Roofing

We remove the contracted existing roofing materials and expose the roof substrate as necessary for the replacement.

6. Roof Deck and Insulation Preparation

Accessible decking is evaluated, and any approved repairs are completed.

Specified insulation, cover boards, and tapered components are installed according to the roofing assembly requirements.

7. TPO Roofing Installation

The selected membrane is installed using the approved attachment method.

Seams are hot-air welded, and perimeter and penetration details are completed.

8. Final Review and Cleanup

We review the completed roofing work, remove project debris, and coordinate required inspections and remaining rooftop equipment work.

Where solar removal and reinstallation is part of the project, the solar work is completed under its applicable scope.

How Much Does Flat Roof Replacement Cost?

The cost of flat roof replacement in Santa Clara and San Mateo Counties depends on more than the square footage alone.

For reference, Home Pro has historically used an approximate planning range of $950 to $1,500 per roofing square for certain flat roof replacement projects.

One roofing square equals 100 square feet.

This is a general historical budgeting range, not a current guaranteed quote. Actual pricing may fall below or above that range depending on the property and scope.

Factors That Affect Flat Roof Replacement Cost

Roof Size and Layout

Larger roofs, irregular shapes, and multiple roof sections can affect material quantities and labor requirements.

Existing Roofing Removal

The number and condition of existing roofing layers affect removal and disposal costs.

Decking Repairs

Water-damaged plywood, OSB, or other roof decking may require replacement or structural evaluation.

TPO Membrane Selection

An 80-mil membrane generally costs more than a comparable 60-mil membrane.

Insulation and Tapered Design

Adding rigid insulation or designing tapered drainage can increase project cost while potentially improving roof performance.

Flashing and Penetrations

Skylights, vents, sidewalls, drains, and equipment curbs require additional detailing.

Existing Solar Equipment

Solar panel removal and reinstallation, replacement racking, and electrical coordination may add to the project scope.

Permits and Site Accessibility

Local permit requirements, building height, access limitations, and equipment needs can also affect the total price.

Home Pro provides a written estimate after evaluating the roof and discussing the work to be performed.

Request Your Free Flat Roof Replacement Estimate.

TPO Compared With Other Flat Roofing Materials

Several roofing systems are used on flat and low-slope buildings.

Home Pro commonly recommends GAF EverGuard TPO, but the best material depends on the structure and its specific roofing requirements.

The comparison below explains the principal differences among five common low-slope roofing systems.

Why Home Pro Often Recommends TPO

For many Bay Area homes, GAF EverGuard TPO offers a practical combination of reflective roofing, welded seams, available membrane thicknesses, and compatibility with roof insulation systems.

However, the selection should always account for the existing building and the complete roof assembly.

Flat Roof Replacement Warranties

Understanding roofing warranty coverage is important when choosing a contractor.

A roofing project may include separate workmanship and manufacturer warranties. These protect against different issues.

Home Pro Flat Roof Workmanship Warranty

Home Pro Roofing and Solar's standard flat roof replacement workmanship warranty is two years.

This covers qualifying workmanship issues under the terms of the Home Pro roofing agreement.

It is separate from any manufacturer warranty on the roofing materials.

GAF EverGuard TPO Manufacturer Warranty

GAF provides manufacturer warranty coverage for eligible EverGuard roofing materials.

For example, GAF's standard single-ply roofing materials limited warranty lists:

• GAF EverGuard TPO 60-mil membrane: 20-year materials warranty term
• GAF EverGuard TPO 80-mil membrane: 25-year materials warranty term

GAF also offers a separate EverGuard Lifetime Residential Limited Warranty for eligible residential installations, subject to its specific terms and registration requirements.

Manufacturer warranty coverage depends on the selected product, roof type, eligibility, applicable warranty document, and any registration or installation conditions.

Material warranties should not be confused with separate manufacturer-issued roofing system guarantees or contractor workmanship coverage.

We explain which warranty applies to the recommended roof system before the project begins.

You can review GAF's roofing products and warranty information through the GAF official website.

Solar and Roofing Warranty Responsibilities

For projects involving existing or new solar equipment, solar installation workmanship and equipment warranties may be separate from the roofing warranty.

If Home Pro performs the solar installation directly, the applicable Home Pro solar workmanship terms govern that work.

If an approved third-party solar installation company performs the solar work, that company provides the installation workmanship coverage described in its agreement.

Home Pro can help homeowners identify the appropriate point of contact when a concern involves both roofing and solar equipment.

Flat Roof Replacement in Sunnyvale, Redwood City, Palo Alto, and Nearby Cities

Home Pro Roofing and Solar is based in Sunnyvale and serves residential roofing customers throughout Santa Clara and San Mateo Counties.

We work with homeowners who need flat roof replacement, Eichler reroofing, TPO membrane systems, tapered insulation, and coordination with existing solar panels.

Flat Roof Replacement in Redwood City

Redwood City homeowners with aging flat roofs may encounter deteriorated roofing materials, old built-up systems, recurring leaks, or inadequate roof drainage.

Home Pro evaluates flat and low-slope roofing conditions and provides replacement proposals using suitable GAF EverGuard TPO roofing assemblies.

We also coordinate existing solar panel removal and reinstallation when included in the project.

Learn more about our Redwood City Roofing and Solar Services.

TPO Roofing Contractors in Sunnyvale

As a Sunnyvale-based contractor, Home Pro provides flat roof replacement services for local homes and qualifying small commercial properties.

Our services include GAF EverGuard TPO installation, roof decking evaluation, insulation upgrades, drainage improvements, and related roofing work.

We also help coordinate flat roofing projects involving existing rooftop solar equipment.

Learn more about Home Pro Roofing and Solar in Sunnyvale.

Eichler Roof Replacement in Palo Alto

Palo Alto has many mid-century modern and Eichler-style homes with flat or low-slope roofs.

When replacing these roofs, considerations may include exposed decking, roof-edge details, insulation limitations, flashing, and drainage.

Home Pro evaluates these conditions and recommends roofing systems appropriate for the building.

Learn more about our Palo Alto Roofing and Solar Services.

Flat and Low-Slope Roofing in Mountain View

Mountain View homeowners with Eichler, mid-century modern, or other low-slope roof designs may benefit from modern TPO membranes and compatible insulation assemblies.

Home Pro provides roof replacement assessments and helps coordinate solar removal and reinstallation where needed.

Flat Roofing in San Mateo County

Throughout San Mateo County, Home Pro provides flat roof replacement services for qualifying residential and small commercial properties.

Our service area includes Redwood City, Menlo Park, San Carlos, Belmont, Foster City, San Mateo, and nearby communities.

Project availability depends on location, roof conditions, and scope.

Santa Clara County Flat Roofing Services

Home Pro also serves homeowners throughout Santa Clara County, including Sunnyvale, Mountain View, Palo Alto, Santa Clara, Cupertino, Los Altos, Los Altos Hills, Saratoga, and San Jose.

If you are unsure whether your property is within our service area, contact Home Pro with your address and project details.

Why Choose Home Pro Roofing and Solar?

Choosing a flat roofing contractor involves more than selecting a membrane.

The contractor must understand how the roof structure, drainage, insulation, waterproofing, and rooftop equipment work together.

Local Roofing Experience Since 2006

Home Pro's business history dates to 2006, with the Home Pro Roofing and Solar branding established in 2019.

We focus on serving homeowners throughout Santa Clara and San Mateo Counties.

Woman-Owned, Sunnyvale-Based Contractor

Home Pro Roofing and Solar is a woman-owned local business based in Sunnyvale, California.

Our legal company name is Professional Home Improvement, Inc. DBA Home Pro Roofing and Solar.

We operate under California Contractor License # 1050229.

Roofing Credentials and Product Expertise

Home Pro Roofing and Solar installs GAF roofing products, including EverGuard TPO systems for appropriate flat and low-slope applications.

Home Pro Roofing and Solar is also a CertainTeed ShingleMaster PRO contractor, qualified to offer CertainTeed SureStart PLUS 4-STAR extended warranty coverage on eligible roofing systems.

The CertainTeed credential and extended warranty apply to qualifying CertainTeed shingle roofing systems, not GAF EverGuard TPO flat roofing.

For TPO projects, we explain the applicable GAF materials warranty and Home Pro workmanship warranty.

Roofing and Solar Coordination

Many roofing contractors do not regularly coordinate projects involving existing solar panels.

Home Pro provides roofing and solar services and can coordinate solar removal and reinstallation as part of roof replacement.

Solar work is performed by Home Pro or appropriately qualified specialists according to the project scope and installation arrangement.

Clear Written Proposals

We explain the recommended roofing materials, anticipated work, optional upgrades, and known conditions affecting the project.

Where hidden damage cannot be evaluated until the existing roof is removed, we explain how additional work will be handled.

Flat Roof Replacement Frequently Asked Questions

What is the best roofing material for a flat roof in California?

For many residential flat and low-slope roofs, GAF EverGuard TPO is a strong option because it offers heat-welded seams, reflective roofing surfaces, and compatibility with rigid insulation systems.

However, the best choice depends on roof slope, decking, drainage, building use, and the complete roofing assembly.

What is the difference between 60-mil and 80-mil TPO?

The primary difference is membrane thickness.

An 80-mil TPO membrane is thicker than a 60-mil membrane and generally carries a higher material cost.

GAF's applicable standard single-ply materials warranty also lists different terms for these two membranes.

The right choice depends on the roof's requirements and the homeowner's priorities.

How long does GAF EverGuard TPO roofing last?

Actual service life depends on installation quality, drainage, environmental exposure, maintenance, and the complete roofing system.

TPO roofs are commonly intended for long-term service, and some may last approximately 20 to 30 years under favorable conditions.

That is a general planning estimate, not a guaranteed roof lifespan or a statement of warranty coverage.

Is TPO roofing a good choice for an Eichler home?

TPO can be an appropriate replacement material for many Eichler flat and low-slope roofs.

The roof assembly must account for the home's deck construction, exposed ceiling details, roof edges, drainage, and insulation limitations.

Can an old tar-and-gravel roof be replaced with TPO?

Yes, many existing built-up roofing systems can be replaced with TPO after the underlying roof conditions are evaluated.

The replacement design must address deck condition, insulation, drainage, and compatibility with the selected membrane.

Does Home Pro install 80-mil TPO roofing?

Yes. Home Pro offers GAF EverGuard TPO 80-mil as an available option for qualifying projects.

We can compare it with the standard 60-mil option during the estimate process.

How much does it cost to replace a flat roof in Redwood City or Sunnyvale?

Flat roof replacement prices vary with roof size, access, existing materials, deck condition, insulation, drainage work, and rooftop equipment.

Home Pro has historically used an approximate planning range of $950 to $1,500 per roofing square for certain projects, but current pricing must be established through a written estimate.

What is tapered insulation, and why is it used?

Tapered insulation consists of insulation boards manufactured with varying thicknesses.

The boards are arranged to create slope and help move water toward drainage locations.

Tapered insulation may also improve the roof's thermal performance.

Will a new TPO roof fix standing water?

A new membrane does not automatically solve ponding water.

Drainage improvements may require tapered insulation, adjustments to drainage outlets, or other changes to the roof assembly.

Home Pro evaluates the existing drainage conditions when planning the replacement.

Can insulation be added when replacing an Eichler roof?

Yes, in many cases rigid insulation can be incorporated into a replacement roofing assembly above the existing deck.

The available insulation thickness depends on roof-edge heights, flashing, drainage, structural conditions, and applicable energy-code requirements.

Does California Title 24 apply to flat roof replacement?

Title 24 may apply to flat roof replacement projects, including requirements involving roof reflectance or insulation.

The specific requirements depend on the building, climate zone, existing construction, scope of work, and applicable exceptions.

Home Pro reviews the project's requirements during roofing planning and permitting.

Do I need a permit to replace a flat roof?

Flat roof replacement commonly requires a building permit in the California communities we serve.

The exact permit requirements depend on the jurisdiction and scope of work.

Home Pro coordinates the applicable roofing permit process as part of its contracted work.

Can I replace my flat roof if solar panels are already installed?

Yes. Existing solar panels can often be temporarily removed so the underlying roof can be replaced.

Home Pro provides solar panel removal and reinstallation services and coordinates the work with qualified personnel as required.

The existing solar equipment and mounting system must be evaluated for reuse and compatibility.

Will my existing solar racking work with a new TPO roof?

Not necessarily.

Some existing mounting components may be reusable, while others may require replacement or modification.

The mounting design must be compatible with the new roof assembly and satisfy applicable structural and installation requirements.

Can solar panels be installed on a flat TPO roof?

Yes. Solar panels can be installed on appropriately designed TPO roof assemblies.

The mounting method must account for wind loading, structure, membrane protection, attachment details, drainage, and maintenance access.

How long does flat roof replacement take?

Project duration depends on roof size, weather, access, tear-off conditions, insulation work, deck repairs, and required inspections.

Some residential flat roof replacements may take several working days, while larger or more complicated projects can take longer.

We discuss the anticipated schedule when preparing the project.

What workmanship warranty does Home Pro provide on flat roof replacement?

Home Pro's standard flat roof workmanship warranty is two years, subject to the terms of the roofing agreement.

This is separate from any applicable GAF manufacturer warranty.

Does a GAF 20-year material warranty mean the entire roof is covered for 20 years?

No.

A manufacturer materials warranty and a contractor workmanship warranty cover different matters.

The specific GAF warranty document identifies the materials, conditions, exclusions, and available remedies.

Home Pro explains the applicable manufacturer warranty and its separate workmanship coverage before installation.

Can a flat roof be repaired instead of replaced?

Some isolated roofing problems may be repairable, depending on the membrane, roof condition, and location of the issue.

For an aging roof with recurring leaks, widespread deterioration, or significant drainage problems, replacement may be a more practical long-term option.

Home Pro primarily focuses on roof replacement. Limited repair work may be considered separately under an appropriate repair agreement, with warranty terms differing from full roof replacement.

Related Roofing and Solar Services

Home Pro Roofing and Solar provides related services that can be coordinated with flat roof replacement.

• Roof Replacement and Installation — Roofing systems for residential properties, including pitched and shingle roof replacements.
• Solar Panel Removal and Reinstallation — Coordinating existing solar equipment with a roof replacement.
• Solar Installation — Residential solar solutions, including projects involving new roofing.
• Battery Backup and Energy Storage — Energy storage options for qualifying homes.
• Standing Seam Metal Roofing — An alternative roofing option for suitable roof designs.
• How to Compare Roofing and Solar Quotes — Important questions to ask when reviewing contractor proposals.

If you are planning both roof replacement and solar installation, evaluating the two projects together can help identify scheduling, mounting, and roof compatibility considerations before installation begins.

Get a Free Flat Roof Replacement Estimate

If you have an aging flat roof, recurring leaks, standing water, deteriorated tar-and-gravel roofing, or an Eichler home that needs a new roof, Home Pro Roofing and Solar can help you evaluate your options.

We provide flat roof replacement services throughout Santa Clara and San Mateo Counties, including Sunnyvale, Mountain View, Palo Alto, Redwood City, Santa Clara, Cupertino, Los Altos, Los Altos Hills, Menlo Park, San Carlos, Belmont, Foster City, San Mateo, Saratoga, and San Jose.

Our team can review your existing roof, discuss GAF EverGuard TPO 60-mil and 80-mil options, evaluate insulation and drainage considerations, and coordinate existing solar panel removal and reinstallation when appropriate.

Home Pro Roofing and Solar

Professional Home Improvement, Inc. DBA Home Pro Roofing and Solar

100 S. Murphy Avenue, Suite 200
Sunnyvale, CA 94086

Phone: (800) 650-3134

California Contractor License # 1050229

Woman-Owned | Serving Local Homeowners Since 2006 | Roofing and Solar Services

Ready to Replace Your Flat Roof?

Request Your Free Flat Roof Replacement Estimate

Or call (800) 650-3134 to discuss your flat roofing project.

No-obligation estimates for qualifying roof replacement projects throughout Santa Clara and San Mateo Counties.