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COOL ROOFING SYSTEMS - ELASTOMERIC COATINGS 

GREEN ROOFS ARE WHITE!

Dallas commercial roofers can provide and install today's leading commercial cool roofing systems. Cool roofing systems are the key to a low cost maintenance friendly commercial roofing system.

 

Whats "Not-Hot" in the commercial roofing market today?

 

Elastomeric Roof Coatings:

Elastomeric coatings have elastic properties, and can stretch in the summertime heat and then return to their original shape without damage. Elastomeric coatings include acrylic, silicone and urethane materials.

 

 

Elastomeric Roof Coatings

 

 

TAX REBATES

http://www.energytaxincentives.org/business/commercial_buildings.php 

 

Cool Roofs

Cool roofs use an energy saving surfacing material which reflects the sun’s heat away rather than transferring the heat to the building below. This will help reduce the cooling costs for building that use air conditioning and for non-a/c buildings it helps to keep the interior cooler and more energy efficient 

Many systems are also eligible for the Texas Energy Rebate which can help to defray the cost of the roofing system installation making it a very economical roofing solution.

 

Elastomeric Coatings are liquid applied, fully adhered, "rubber-like" protective membranes. They can be applied as part of a roof or wall system during the construction stage, in retrofit or as a maintenance application. Both primer and finish coats can be spray applied to ensure quick application, consistent appearance and a durable finish.

 

There are a great many additional benefits to having a Cool Roof installed:

  • Maintenance costs are TAX deductible. Cover the entire roof as maintenance because thats what a Cool Roof is!

  • It has low installation costs. There are no dump fees and compared to other types of roofing there is less labor involved so most of the cost is for the roof membrane material itself.

  • Unlike the traditional “hot mop” roofing, with Cool Roofs there is no hot asphalt or fumes involved.

  • Cool Roofing can be installed without tearing off your old roof, which can expose the inside of your building to weather damage.

  • Applying a Cool Roof is quieter for the building occupants since there is no heavy tar equipment being used.

  • Easy maintenance. Traditional roofs are covered with gravel or some other type of granules to protect the surface of the roof. With a Cool Roof system the covering used is smooth and seamless and does not require any kind of gravel cover.

  • Lasts longer and the roofing system can be upgraded.

  • Cool Roofs can be applied over BUR, Single Ply, Modified Bitumen, gravel and metal roofing.

  • Reduces air conditioning costs

  • Low installation costs with no dump fees

  • No hot asphalt or fumes

  • Prolongs the life of the roofing system

  • Seamless, tough, flexible

Cool Roofing installations have a 25+ year track record along with UL ratings and a generous 10 year manufacturer's warranty.

 

What is a Cool Roof? 

A cool roof is one that reflects the sun’s heat and emits absorbed radiation back into the atmosphere. The roof literally stays cooler and reduces the amount of heat transferred to the building below, keeping the building a cooler and more constant temperature. Imagine wearing a white or a black T-shirt on a hot day. By wearing the white T-shirt you will remain cooler than if you wore a black T-shirt because it reflects more sunlight and absorbs less heat. Cool roofs like a white T-shirt, keep the internal temperature of the building cooler.

However, a cool roof need not be white. There are many “cool color” products which use darker-colored pigments that are highly reflective in the near infrared (non-visible) portion of the solar spectrum. With “cool color” technologies there are roofs that come in a wide variety of colors and still maintain a high solar reflectance.

The two basic characteristics that determine the ‘coolness’ of a roof are solar reflectance (SR) and thermal emittance (TE). Both properties are rated on a scale from 0 to 1, where 1 is the most reflective or emissive. 

The CRRC measures these two properties for roofing products, both for the product’s initial values and after three years of weather exposure. The CRRC publishes the results on the online Rated Products Directory. The online Directory is available to the general public at no charge, and it allows you to compare the rated values of various product types and brands.

What are the Benefits of a Cool Roof?

There are numerous benefits in having a cool roof:

  • Increase ecological sustainability factor, or make your house “greener” by:

    • Reducing your utility bills associated with air conditioning

    • Increasing occupant comfort and avoid installing an air conditioner where there isn’t already one

    • Decreasing the size and prolong the life of your air conditioning system

    • Lowering roof maintenance costs and extend roof life, avoiding re-roofing costs and reducing solid waste  

  • Assist your home in meeting building codes

  • Mitigate your community's Urban Heat Island Effect

  • Maintain aesthetics with a roof that performs and looks good

  • Receive utility rebates (in some locations)

In a nut shell, a cool roof can significantly reduce your cooling energy costs and increase your comfort level by reducing temperature fluctuations inside your home.  Average energy savings range from 7%-15% of total cooling costs. 

When people think about making their home more “green” or ecologically sustainable, cool roofing isn’t always the first thing to come to mind.  However, certain green building programs, such as the U.S. Green Building Council’s LEED, give credit for installing a cool roof.  So if you are trying to save energy or make your home more environmentally-friendly, a cool roof is one way to achieve that goal. 

 

What is the right roofing material for your home or building?

Although the CRRC cannot recommend specific roofing products, below is a description of some things to consider in selecting a roofing product for your building, including a description of the types of roofing materials currently rated in our program. 

Slope

All roofs essentially fall into one of two general categories:  low-slope (less than 2 inches of rise over 12 inches of run) and steep-slope (2:12 or greater).  Our directory indicates which slope(s) a product is intended for. In addition, we recommend that you check with a local roofing contractor, roof consultant or architect to determine the most appropriate roofing product type for your home.

Climate

In most climate zones worldwide, cool roofs can significantly reduce a building’s cooling load. However, cool roofs can also increase heating costs in winter months. This increase is usually greatly outweighed by the cooling energy savings achieved during summer months because the sun is low in the sky during winter months, the weather tends to be overcast, and snow often covers the roof, usually making the heat gain through the roof negligible in all but the most northern climate zones in the US.

In selecting your roof, it is important to understand your climate zone and the actual energy your home or building will save. There are two cool roof calculators available online that can give good estimates of how much energy you will save. You can find them at:

DOE Cool Roof Calculator
http://www.ornl.gov/sci/roofs%2Bwalls/facts/CoolCalcEnergy.htm

 

Product Types 

Below is a list of definitions of roof product types.

  • Built-up Roofing (includes asphalt and coal tar pitch): Built-up Roofing (BUR) consists of built-up layers of coated asphalt and insulation applied on site and can be covered with a capsheet (or surfacing material). 

 

  • Foam Roof Systems: Foam systems can also be divided into the field-applied and factory-applied categories.  Field-applied foam systems are similar to field-applied coatings, as they are sprayed on in liquid form and harden as they set on top of the roof.  Factory-applied foam systems are formed into rigid panels and coated with a reflective coating.  The foam usually give the roof system additional insulation properties.

 

  • Metal: Metal roofing products can be shaped to look like shingles, or shakes, or to fit unique curvatures, in addition to a typical “standing seam” configuration.  They come in a variety of textures and colors, including some darker “cool” colors with special additives that allow these dark colors to achieve significantly greater reflectance than previous versions of the same product. 

  • Modified Bitumen: Modified bitumen is bitumen (asphalt or tar) modified with plastic and layered with reinforcing materials then topped with a surfacing material.  Like BURs, the radiative properties of modified bitumen (mod bit for short) are determined by the surfacing material. 

  • Roof Coatings:  Roof coatings can be divided into two categories: field-applied and factory-applied.  Field-applied coatings are applied directly onto the roof surface, either on a new roof assembly or over an existing roof surface (and can be applied over top of just about anything, so long as the right coating is selected). Factory-applied coatings are applied at the factory prior to distribution.  Examples of factory-applied coatings include coatings applied to metal and glazes that are applied to tiles.

  • Shingles, Slate, or Tile: All of these products types use the same concept, where pieces fit together to form a roof. Asphalt shingles are fairly common for residential roofing applications, probably because they are relatively inexpensive and simple to install. Slate and tile products also come in a wide variety of colors, shapes and textures, and, because of their heavy mass, they have thermal properties that may yield additional energy savings beyond their reflectance and emittance properties.

  • Single-Ply:  Single-ply roofing is a pre-fabricated sheet of rubber polymers. Single-ply roofing is laid down in a single layer over a low or steep-sloped roof. The single-ply membrane can be loose-laid and weighted down with ballast or pavers or firmly set on the roof and attached with mechanical fasteners or adhesives. There are two main types of single-ply materials:

  • Single-Ply-Thermoset (includes EPDM, Hypalon): Thermosets are materials that can not be hot-air welded because it changes their physical characteristics. Instead, tape or a contact cement to seal the seams.

  • Single-Ply–Thermoplastic (includes TPO, PVC, etc.): Single-Ply-Thermoplastic is a flexible sheet membrane which consists of compounded plastic polymers.  When heat is applied onto the surface, the single ply-thermoplastic seams are melded together making the material seamless and effective. Most thermoplastics are manufactured to include a reinforcement layer (usually polyester or fiberglass) for extra durability and strength.  There are various types of single-ply-thermoplastic such as PVC & TPO.  PVC (polyvinyl chloride) is a synthetic polymer prepared from vinyl chloride. It tends to be more expensive than TPO, but is well known for long-term performance and is naturally fire-retardant. TPO (thermoplastic polyolefin) is a blend of polymers that can contain flame-retardants or UV absorbers.

Product Types Currently not included in the CRRC Rating Program:

  • Ballasted Roofs: Ballasted roofs are roofing systems that include a waterproof material (like a single-ply membrane) weighed down with heavy materials, called a ballast. The ballast is typically some sort of stone or concrete paver.

  • Green Roofs: Green roofs (also known as garden roofs or vegetated roofs) use plants as roof covering. Though technically not highly reflective, green roofs do provide similar energy savings and urban heat island mitigation benefits as cool roofs. They also absorb water, reducing storm water runoff. Green roofs are distinct from cool roofs and are not rated by the CRRC. 

What Kinds of Cool Roof Products Are on the Market?

 

The roofing market provides products for two distinct segments: low-sloped roofs and steep-sloped roofs. Low-sloped roofs are found on most commercial and industrial buildings, as well as warehouses and

some residences. Steep-sloped roofs are found on most single-family homes. Cool roof options for low-sloped roofs include cool roof coatings and cool single-ply membranes. Cool roof options for steep-sloped applications include reflective tiles and metal roofs.

Cool Roof Coatings

Cool roof coatings are white liquids – the consistency of thick paint – applied over an existing roof structure. Coatings are designed only for use on low-sloped roofs. They can be applied over a traditional roof to achieve energy savings, an extended life span, and protection from weathering and ultraviolet (UV) radiation. The new surface can last 10 to 20 years, depending on coating quality and the thickness at which it is applied.

Cool roof coatings go on with a power sprayer or roller. Home and building owners should ensure that the underlying roof substrate is sound before a coating is applied, as these products are not intended to plug leaks or otherwise improve the structure of a roof.

Most cool roof coatings can be described as one of the following:

  • Elastomeric

  • Polyurethane or

  • Acrylic.

  • Cool roof coatings may be applied with a roller.

Each has been found to retain solar reflectance over time. 

Cool roof coatings costs: between $0.75 and $1.50 per square foot for materials and labor. Installation cost varies, however, depending on the condition of the roof, size of the job, number of roof penetrations or obstacles, and the ease of access to the roof. For accurate cost information on a particular project, a professional roofing contractor should be contacted.

Cool Single-Ply Membranes

Single-ply roofing is the catchall name for roofing materials that come in pre-fabricated sheets and are applied in a single layer to a low-sloped roof. Single-ply roofs are a flexible or semi-flexible roof membrane typically constructed of rubber or plastic materials. Single-ply roofs can be manufactured in a bright-white color for high solar reflectance– or albedo – and increased energy savings.

Single-ply roofs are durable and can cover a number of roof structures. They are typically delivered in rolls, and applied by heat sealing the seams, or with caulk. Some of the newest single-ply roof products are made with self-cleaning and mold-resistant polymers to maintain solar reflectance.

Since the "single-ply" classification includes both light- and dark-colored materials, products that are highly reflective should be selected for heat island reduction and energy savings purposes. Examples of single-ply products include:
 

  • EPDM (ethylene-propylene-diene-terpolymer membrane): a flexible elastomeric single-ply roofing material.

  • PVC (polyvinyl chloride): a synthetic thermoplastic polymer prepared from vinyl chloride. It is the most expensive of the three, but is well known for long-term performance.

  • TPO (thermoplastic polyolefin): a blend of polymers that may or may not contain desirable additives such as flame-retardants or UV absorbers. It can last 30 years and is largely maintenance free.

Single-ply roofing costs vary considerably from $1.50 to $3.00 per square foot, including materials, installation, and reasonable preparation work.

Reflective Tiles

Tiles usually are made of clay or concrete, and the solar reflectance of traditional tiles ranges from 10-30%. Manufacturers have begun to develop cool tiles that contain pigments that reflect in the infrared. Special pigments allow roofing materials to keep their traditional colors, such as brown, green, and terra cotta, while reflecting away up to 70% of the sun's energy. These products enable buyers to forego the perceived tradeoff between energy efficiency and the aesthetic concerns that may arise with a bright-white roof.

The cost of reflective tiles is around $3.00 per square foot. They are well-known for durability and long life, and are most often used on new homes or on higher end reroofing projects.
 

Metal Roofs

Several EPA ENERGY STAR ® labeled metal roof products are available for residential use. These materials have a high albedo to reflect the sun's radiation. Unless treated metal has a low thermal emittance   and retains the heat that it does absorb. Manufacturers have recently developed cool metal roofing products that use pigments that reflect infrared radiation, further increasing the solar reflectance of metal roofing, keeping it cooler.

Dark-colored metal roof applications are also available. These options reflect solar radiation and save energy while meeting consumers' aesthetic demands.

Metal roofs generally start at $2.00 per square foot, and are known to be durable and long lived.

What Is the Size of the Cool Roof Market?

There are few reliable data segmenting the roofing market into highly reflective and traditional roof applications. What is known about the size of the cool roof market comes from roof marketing surveys and opinions that characterize the demand for reflective products.

Industry sources suggest, for instance, that 10% (by dollar value) of the commercial roof market is represented by highly reflective products. Regardless of whether this figure is precise, the existence of large-scale incentive programs for purchasing cool roof products – in combination with data from roof manufacturers and contractors – indicates that market share for commercial applications is growing.
 

How Does the Cost of Cool Roofs Compare with Traditional Roofs?

On a unit-area basis, reflective roofs are usually cost-competitive with and sometimes less expensive than traditional roofs at the time of purchase. Of course, this depends on the specific types of roofs under consideration, their quality, local availability, and other factors.

When the life-cycle costs of cool and traditional roofs are compared, however, cool roofs are often less expensive. This is because, once installed, electricity demand is reduced and summertime savings on energy bills begin to add up. In fact, experience has shown that, over time, most reflective roofs pay for themselves.

Cool roofs can be installed on both new buildings and older structures due for re-roofing. Because most roofs require regular maintenance, as well as periodic re-roofing or recoating, opportunities to switch to cool materials and improve roof reflectance are regularly presented.

For more information on cool roofs and the cool roof market, visit EPA's ENERGY STAR ® Roof Products Web Site.

Energy Efficiency

There are two things that keep a roof cool.

  • High Reflectivity

  • High Emissivity

Cool roof coatings reflect 70% to 90% of the sun's energy when newly installed. Most of the energy is radiated away. Conventional roofing materials have reflectivity of 5% to 25%, meaning they absorb 75% to 95% of the sun's energy. A typical “white” capsheet roof only reflects 25% of the sun's energy. The absorbed energy is transferred to the building.

Emissivity is the ability to radiate away absorbed heat. Most cool roof coatings emit 90% or more. Even though aluminum coated roofs are highly reflective they are not considered a cool roof because they only emit 50% to 60% of the absorbed energy.

A conventional roof can get up to 180º on hot sunny summer days. A cool roof coating keeps the roof at just 10º-15º above the air temperature. This means a cool roof can be 80º to 90º cooler than a conventional roof.

Even at relatively cool temperatures there is a big difference in how much heat is absorbed. The chart shown below, done by Lawrence Berkeley National Laboratory, demonstrates how different roofing materials are affected on a sunny day when the air temperature was only 55º.

 

Ambient Temperature 55° F
Roofing Material

Degrees F

Black Acrylic paint

142°

Galvanized steel

138°

"white" fiberglass cap sheet

118°

Clay terra cotta tile

112°

Red acrylic paint

106°

White acrylic paint

74°

Hyper white acrylic paint

65°

Cooler roof surfaces means less heat is transferred into the building. If you air condition a building one will save money on cooling energy. How much savings will depend on many factors including roof insulation, cooling system equipment and other variables. In the right situation, a reflective roof can bring cooling savings of up to 50%, with a reduction in peak cooling demand of 10% to 15%.

 

 CONTACT US for your free cool roof roofing estimates

 

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