Energy-Efficient Roofing Materials in California: What to Know Before You Replace Your Roof

If your home feels warm long after the sun goes down, you may be wondering whether a different roof would help. That is a reasonable question to ask when you are already planning a roof replacement.

There are several energy-efficient roofing materials in California to choose from. But before picking one, it helps to understand what makes a roof “cool” and what that could mean for your home.

What Is a Cool Roof?

A cool roof reflects more sunlight and releases absorbed heat effectively. This can reduce the amount of heat passing into the building and help ease the demand on your air conditioning.

You will usually see two terms when comparing products:

Solar reflectance: How much sunlight the surface reflects.
Thermal emittance: How effectively the surface releases absorbed heat.

You do not need to memorize the numbers. Ask your contractor to explain the ratings for the roof you are considering and how they compare with your other options. The Cool Roof Rating Council publishes ratings for new products and after three years of outdoor exposure. Source: Cool Roof Rating Council

Which Roofing Materials Should You Consider?

The material underneath a roof’s surface helps give it strength and weather protection. The surface itself plays a big part in how much sunlight it reflects. That is why choosing an energy-efficient roof means looking at both the roofing system and the exact finish or color.

Here is how the options compare and why you might consider each one.

1. Cool Asphalt Shingles

What are they made from? Modern asphalt shingles generally have a fiberglass mat coated with asphalt and topped with protective mineral granules. Cool-roof shingles use specially designed reflective granules on the exposed surface.

How do they help with heat? Those granules reflect more solar energy, including some invisible near-infrared sunlight, than conventional granules in a comparable color. Less absorbed sunlight means less heat building up at the roof surface. The reflective surface is the feature to look for when comparing energy performance.

Two examples are GAF Timberline HDZ® RS, which uses EcoDark® granule technology, and CertainTeed Landmark Solaris®, a solar-reflective asphalt shingle.

Why consider them? They are worth comparing if you want to keep the familiar look of shingles while choosing a roof with reflective properties. You may also have darker color options available. Ask for the rating of the exact product and color you like before making your selection.

2. Composite Tile Roofing: Brava Spanish Barrel Tile

What is it made from? Brava Spanish Barrel Tile is made from a synthetic composite using recycled materials. It is molded to resemble traditional curved clay tile and offers a lighter-weight alternative. Source: Brava

How does it help with heat? For energy performance, focus on Brava’s designated cool-roof colors, such as Cool Terra Cotta and Cool French Clay. These options have rated reflective properties that can help limit solar heat absorption. The recycled content and light weight are separate benefits; they do not, by themselves, establish cool-roof performance. View Brava’s cool-roof colors.

Why consider it? It is an option if you like the appearance of a Spanish tile roof and want to explore a lighter composite material with cool-color choices. Have your contractor check the roof’s slope, structure, and installation requirements, then confirm the rating of the selected color.

3. Metal Roofing With a Reflective Finish

What is it made from? Metal roofing commonly uses steel or aluminum formed into panels or shingles. For a cool-roof option, look for a factory-applied reflective finish.

How does it help with heat? A reflective finish sends more sunlight away from the roof. Some finishes use cool-color pigments that reflect near-infrared sunlight while retaining a darker appearance. Solar reflectance and thermal emittance both matter, so a shiny appearance alone is not enough to judge performance. Source: Berkeley Lab

Why consider it? If you like the appearance of metal roofing, a rated reflective finish lets you include energy performance in that choice. Compare the complete installation, coating specifications, and warranty along with the color samples.

4. Reflective Roofing for Flat and Low-Slope Roofs

Flat and gently sloped roofs need a system designed for their slope and drainage. Two options to discuss are TPO and modified bitumen with reflective surfacing.

GAF EverGuard® TPO in white

TPO stands for thermoplastic polyolefin. It is a flexible polymer roofing membrane installed in sheets with heat-welded seams. The white surface reflects sunlight and releases absorbed heat, helping limit heat gain through the roof. The welded seams serve a different purpose: they help keep the roof watertight.

Why consider it? It is worth discussing for a low-slope roof where a reflective single-ply system is appropriate. Ask how insulation, attachment, drainage, and flashing will be handled. View GAF EverGuard TPO.

CertainTeed Flintlastic® SA Cap with CoolStar® surfacing

This cap sheet uses polyester reinforcement and SBS-modified bitumen asphalt modified with a polymer for flexibility. It forms the exposed layer of a compatible multi-layer roof system. The CoolStar surfacing provides the solar-reflective feature; make sure that is the version specified in your estimate.

Why consider it? It offers a reflective option when a self-adhered modified bitumen system suits your low-slope roof. Compare the entire system, including its underlying layers, with the other options your contractor proposes. View CertainTeed Flintlastic SA Cap.

5. Reflective Roof Coatings

Roof coatings are applied as a liquid and cure into a protective surface. A reflective white coating can help reduce sunlight absorbed by a compatible roof. Whether coating makes sense starts with the condition of the roof underneath it.

GAF Premium Acrylic HydroStop® Top Coat

This is a water-based acrylic elastomeric coating. Used with HydroStop Base Coat and Premium Fabric, it forms a reinforced liquid-applied roof system. Ask about a reflective white specification: its surface handles sunlight, while the reinforced assembly provides weather protection.

Why consider it? It may be an option for a suitable, structurally sound roof that can be restored. Your contractor should specify the complete system and confirm compatibility, drainage requirements, and current reflectance ratings. View GAF HydroStop Top Coat.

CertainTeed SMARTCOAT™ 450 High Solids Silicone in white

This silicone-based coating cures into a flexible, weather-resistant membrane. Its white finish provides a reflective surface, while the silicone coating offers resistance to UV exposure and ponding water.

Why consider it? It may suit a roof that is a good candidate for restoration, particularly where the existing surface and exposure conditions favor silicone. Ponding-water resistance does not remove the need to assess drainage or repair underlying damage. View CertainTeed SMARTCOAT 450.

Before choosing a coating, ask what repairs, cleaning, primer, and application thickness are required. For every roofing option, check the exact product’s current ratings and suitability for your project. Reflectivity helps control solar heat gain; insulation and the rest of the roof assembly also affect how much heat reaches the rooms below.

Does an Energy-Efficient Roof Have to Be White?

No. Some darker roofing products use special pigments to reflect sunlight that we cannot see. That means you may have options that work with your home’s exterior without choosing a white roof.

Still, color alone does not tell you how a product performs. Check the rating for the exact option you want. Source: Cool Roof Rating Council

What About California’s Roofing Requirements?

You may hear the term “Title 24” when discussing your roof replacement. This includes California’s energy standards, which can affect the roofing products used on a project.

For permit applications submitted on or after January 1, 2026, the applicable statewide energy standards are the 2025 Energy Code. Source: California Energy Commission

Cool-roof requirements depend on factors such as your climate zone, building type, roof slope, and the amount of roofing work being done. A product having a CRRC rating does not automatically mean it meets the requirements for your property.

Before materials are ordered, ask your contractor to confirm that the selected product and color meet the requirements for your project. Source: CRRC California Energy Code guidance

Will It Make a Difference to Your Energy Bills?

A cool roof can help reduce summer cooling needs, but it is hard to put a dollar amount on that without looking at the building. Results vary by climate and installation. Source: Cool Roof Rating Council

There is also a seasonal trade-off: reflecting sunlight can increase heating needs in colder weather. That is why it makes sense to consider your home’s conditions throughout the year. Source: Berkeley Lab

If keeping your home comfortable is a priority, bring it up during the inspection. Ask whether the attic insulation, air sealing, and roof assembly should also be evaluated. Be cautious about choosing a roof based on a promised percentage of savings without an explanation of how that number was calculated for your home.

Before You Choose a Material

When comparing estimates, these are useful questions to ask:

Is this material suitable for my roof?
What is the rating for the exact product and color I selected?
Does it meet the requirements for my project?
What work is included beneath the roofing material?
What do the material and workmanship warranties cover?

You should feel comfortable asking for a plain-language explanation. A roof replacement is a significant project, and knowing what is included makes the decision easier.

Planning a Roof Replacement in Concord?aterial

If you are comparing energy-efficient roofing materials in California, start with the roof you have. An inspection can help you understand what needs attention and which options are worth considering.

For homeowners in Concord, Walnut Creek, and nearby communities, contact Acker Roofing to schedule an inspection and talk through your roof replacement options.

Frequently Asked Questions About Energy-Efficient Roofing

What is the best energy-efficient roofing material for a California home?

It depends on your roof’s slope, your local climate, and the specific product you choose. Cool asphalt shingles, reflective metal, and Brava’s cool-color composite tiles are options for suitable pitched roofs. For low-slope roofs, white TPO or modified bitumen with reflective surfacing may be worth considering. Compare the ratings of the actual products rather than choosing by material type alone.

Can a dark-colored roof still be energy efficient?

Yes. Some darker roofing products use special reflective granules or pigments that reflect sunlight we cannot see. Examples include GAF Timberline HDZ RS and CertainTeed Landmark Solaris shingles. Check the rating for your selected color, since appearance alone does not tell you how well it performs.

Will a cool roof lower my electricity bill?

It can help reduce the energy needed for air conditioning by limiting heat entering through the roof. However, the savings depend on your climate, insulation, cooling system, and other features of your home. A specific reduction in your electricity bill should not be guaranteed.

Do all California roof replacements require a cool roof?

No. The requirements depend on the property’s climate zone, building type, roof slope, project scope, and applicable compliance provisions. Your contractor should confirm the requirements for your property before ordering materials.

Are all Brava tiles considered cool-roof products?

Do not assume that every Brava color has the same reflective performance. For Spanish Barrel Tile, Brava lists cool-roof options such as Cool Terra Cotta and Cool French Clay. Ask for the current rating of the exact product and color being proposed.

Can I apply a reflective coating instead of replacing my roof?

Possibly, if the existing roof is suitable for restoration. A contractor should first inspect it for damage, moisture problems, drainage issues, and compatibility with the coating. GAF HydroStop and CertainTeed SMARTCOAT 450 are examples to discuss, but the right choice depends on the roof underneath.

Do I still need insulation if I install a cool roof?

Yes. A cool roof and insulation do different jobs. The reflective roof surface helps limit solar heat absorption, while insulation slows heat moving through the building assembly. Choosing a cool roof does not replace the need for appropriate insulation.

How do I know whether a roofing product meets California’s requirements?

Ask your contractor for the exact product name, color, and Cool Roof Rating Council rating. Those ratings must be compared with the requirements for your project. A CRRC listing provides performance information; it does not automatically mean the product qualifies for every California roof.

Dean M.

General/Project Manager at Acker Roofing Inc. with over 45 years in the roofing industry. As a GAF, CertainTeed, and Brava Tiles certified professional, I’ve managed countless projects and enjoy sharing tips and insights to help property owners protect and get the most out of their roofs.