Eco-Friendly

Roofing Keeps

the Home Dry

and Green

Green Roof

Clay Roof

Cool Roof

High SRI/Metal Roof

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ROOFING

Ahome’s roof traditionally kept the weather out, conditioned air in, and the family, safe, snug, and dry.

But today’s eco-aware consumer wants more, demanding that roofing materials promote energy savings, provide more insulation, and even help decrease urban heat island effect by becoming a garden. The modern green roof offers a host of benefits, including the ability to reflect sunlight away from the home, faster dissipation of absorbed heat, higher insulation ratings, little or no chemical leaching, and the ability to become an eye-pleasing, table-filling landscape feature.

Eco-friendly roofing options are making shopping for a new roof more interesting than ever. Some roofs include recycled materials. Other are made of materials that lower roof temperatures by as much as 60°F. Still others offer increased fire or weather resistance. There are now roofing materials that, when properly installed, come with a 50 year warranty. For most homeowners, this means they’ll never have to replace their roof again.

If roof replacement is not currently in the budget, there are other, more affordable roofing technologies available that can accomplish many of the eco-consumer’s demands. Special solar reflectance coatings can reduce heat absorption and transmittance of heat into the home. They also extend life expectancy of the existing roof. A truly “green” roof can be an actual garden, as discussed more in detail elsewhere in the ROOTs eco-friendly journey.

All these eco-friendly roofing technologies result in several environmental and personal benefits: lower utility bills because of reduced energy consumption; reduced consumption of non-renewable resources by using recycled materials; fewer roof replacements due to extended life span; improved storm water management with green garden roofs. The homeowner benefits, the environment benefits, and the world benefits.

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Green Roof

What is it?

Eco-friendly roofing products have become an important element of energy conservation and green homes. Green roofs are made from materials that are recycled, reflect sunlight and heat away from the home, or include some type of environmentally friendly feature. Green roofs usually include vegetation roofing, but many homeowners prefer to use more conventional roofing styles. There is a host of eco-friendly roofing options that include recycled shingles, roofing made from natural materials, metal roofing, and cool roofs. Recycled materials used to manufacture roofing include plastic, rubber, metal, wood fiber, home waste, and factory waste. Slate and clay tiles are also a green option, since they are made from natural materials. Metal roofing can be made from all-new metal or a combination of new and recycled metal. They have many green features including durability and fire resistance and are ideal for rainwater harvesting since there is no chemical leaching. Energy Star-certified cool roofs have high solar reflectance, meaning they reflect sunlight and heat away from the house. The roof can be as much as 50–60°F cooler than conventional roofing, according to the Environmental Protection Agency (EPA).

Why do it?

Environmental Qualities

Reduces greenhouse gas emissions by reducing energy use

Cool roofs lower roof temperature by up to 1000F, reducing heat island effect

Diverts materials away from landfills

Reduces need for natural resources

Most green roof materials can be recycled indefinitely

Pros:

Lowers heating and cooling expenses from 10% to 25%.

Contributes to a more comfortable home environment by regulating the temperature

Reduces indoor heat-related illnesses

Most recycled shingles are impervious to hail

Metal roofs are durable, fire resistant and have a long life, which reduces roof replacement costs

Most green roofs have low or no chemical leaching like that experienced with standard asphalt roofs

Some recycled roofing products have 40–50 year warranties

Might qualify the house for lower insurance rates

Cons:

Greenroof options are more expensive than conventional roofing

May be challenging in some locales to find a local retailer

selling green roof products

Maintenance:

Every roof should be kept free of mold and debris, including leaves and tree branches. Damaged shingles need to be replaced as soon as they occur. Metal roofs with protective coating may need periodic resealing, and paint scratches should be repaired.

Timeline:

It takes approximately 1 day to install 1,500 square feet of roofing to replace a built-up roof (layered roofing finished with a coating). A single-ply roof can be replaced or installed at 2,000– 4,000 square feet each day, depending on the material and roofing crew experience.

Steps:

A roof should be installed by a licensed, bonded roofing contractor who is trained and experienced in eco-friendly roofing installations. Homeowners should only install a roof if they are experienced, own proper equipment, can safely climb ladders and walk on a roof. The basic steps are as follows:

1.Measure the area to be roofed.

2.Purchase roofing materials and supplies.

3.Remove old roofing (if replacing a roof).

4.Make repairs to sheathing, fascia, or soffit as needed.

5.Lay roofing felt.

1.Secure felt with nails or galvanized screws.

2.Tack on flashing.

3.Measure for horizontal and vertical lines and chalk red layout lines.

4.Install starter strips and then shingles.

5.Cut out ventilation slots and install ridge vents.

Cost Estimator:

Green roof products can cost 2 to 4 times more than standard asphalt shingles.

Material expenses for metal roofing is approximately $2.50-

$5.00 per square foot.

Cool roof coating averages $0.75–$1.50 per square foot.

Cool roof membrane averages $1.50–$3.00 per square foot.

Quick Tips:

✓✓If removing an old roof, take waste to a recycler rather than a landfill

✓✓Solar shingles are available for homes interested in generating power using sunlight and are installed flush with other shingles

✓✓Make sure the attic is properly ventilated and insulated to extend the life of your roofing.

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Clay

Roof Tiles

What is it?

The history of clay tile roofing goes back at least 10,000 years to China and the Middle East. From there, it spread to the Europeans who brought it to America, where it was in use by the 16th century. One important quality of clay tile roofing is that it is fireproof. Today, clay tile roofing is available in a variety of colors, finishes, and designs according to builders’ needs and wants. Typically used on roofs with steep slopes (greater than 14°), they are made of a natural resource— clay—which makes them perfect for green homes. Molded into the desired shape and baked, they can be used in any climate on residential or commercial structures. Moreover, they don’t age like fiberglass or wood shingles.

In addition to being non-combustible, clay tile roofing requires little maintenance and can withstand strong winds and drastic temperature changes.

Why do it?

Environmental Qualities

Made from natural resources

100% recyclable

Reduces heat island effect

Pros:

Fire resistant

Can last up to 100 years

Absorbs little water

Provides superior ventilation

Cons:

Heavy

Expensive

Maintenance:

Inspect clay tile roofing annually. Check for:

cracked tiles

tiles that are out of place

missing tiles

missing or disintegrating mortar

Minor repairs can be simple weekend projects for the do-it- yourselfer, but a professional should be called for major repairs. With proper maintenance clay tile roofs will last for 100 years or

more.

Timeline:

Installing a clay tile roof can take a few days to up to a week depending on the size of the roof.

Steps:

1.Clay tile roof systems should be applied over continuous, flat wooden decking. If you are using plywood, choose one that is 5/8-inch nominal exterior-grade.

2.Underlayment (also known as“felt paper”) is then installed over the roof deck before the application of tile. An underlayment has two functions: to provide temporary weather protection until the tile is installed, and to provide a secondary weatherproofing barrier if moisture infiltrates the tile roof covering. Asphalt- saturated, non-perforated organic felts are the most common underlayments used.

3.Before selecting a securement method, consider wind, deck type, seismic conditions, slope, building codes, local practices, and manufacturer recommendations Here are some common methods:

Nails

Wire tie and strapping systems

Clips

Lug-hanging

Bedding Tile

Cost Estimator:

According to the Homewyse.com roofing cost calculator, the installation of clay tile roofing costs on average between $8.54 and $13.60 per square foot, depending on where you live. For a 1,500-square-foot home, it is good to estimate about 1,800 square feet of roofing.

Quick Tips:

When purchasing a new roof system, there will be two warranties to consider, each of which should be transferrable to new owners if necessary.

✓✓The manufacturer’s warranty covers defects in the manufacture of the roof covering. Once the project is complete, the contractor should provide a certificate for the homeowner’s records.

✓✓The roofing contractor should also provide you with a warranty covering workmanship. This covers installation and related issues. Most companies offer 1-2 years of coverage. Finding a company that has been in business for several years and offers a longer warranty can work in the homeowner’s favor.

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Cool

Roof

What is it?

✓✓Most common roofing materials absorb and transfer heat from sunlight and hot summer air into the building’s interior. By contrast, cool roofs consist of reflective and emissive materials that block heat absorption and reduce heat transfer. Cool roofs, which have light-colored material, will not raise roof temperatures by more than 15°F, compared to the 72 to 90°F of common asphalt shingles. Thus, installing a cool roof over your existing roof can significantly reduce cooling and maintenance costs.

✓✓Cool roof surfaces can be applied in almost any situation, regardless of the slope of your building’s roof. There are many options for installing a cool roof:

✓✓Designed for low- sloped roofs, liquid white coatings are applied like paint over existing roofing materials and..

✓✓Also designed for low-sloped roofs, single-ply membranes are pre-fabricated rubber or plastic sheets that cover existing roof materials in a single layer.

✓✓Usually used for steeper slopes, reflective clay/concrete tiles can replace existing roofing materials.

Why do it?

Environmental Qualities

Reduces the urban heat island effect

Extends roof life, reducing roof replacement requirements and materials taken to landfills

Pros:

Reduces energy bill

Cool roofs protect existing roof materials, which means a longer roof life and lesser maintenance

Cons:

Can increase heating load in cold regions by blocking heat absorption

Can be expensive to purchase, might require professional installation

Maintenance:

A checkup in the fall and spring, just like for a standard roofing system, will keep the cool roof efficient longer. It can be washed annually to keep the light roof surface clean, thereby getting the maximum benefit out of the roof surface.

Timeline:

Some coatings can be installed in as little as 1 day, though others may require longer. The amount of time it takes also depends on roof size.

Steps:

The steps required depends on the type of roof covering desired, but the most common for homeowner application is the liquid coating, which requires a roller and pan and comes in 5-gallon buckets. Ensure that safety precautions are taken since falls can occur when working on a roof.

1.Measure roof to determine how many gallons of coating are needed. One 5-gallon bucket will generally cover about 500 square feet. Assume a 1,500-square-foot home will need about 1,800-square-feet of roofing material. (1800/500 = 4 buckets).

2.Purchase materials, including the roller and bucket screen. (Ladders, safety harnesses, and ropes can be rented if they are not readily available).

3.Roll coating on the roof, beginning at highest points and working downward. Ensure even coverage. New or well-worn roofs might require two coats.

Cost Estimator:

Cool roof coatings on a low-slope roof might cost $0.75–$1.50 per square foot, while single-ply cool roof membrane costs $1.50–$3.00 per square foot. The cost premium for cool roofs versus conventional roofing materials ranges from 0 to 5 or 10¢ per square foot for most products.

Quick Tips:

Look for the following while shopping for cool roof products:

✓✓Contact a licensed C-39 roofing contractor to get an installation.

✓✓Energy Star-labeled products can reduce cooling demands by 10–15% more than other cool roof materials.

✓✓To see if you are eligible for additional savings, check out the CRRC’s handy list of rebate programs.

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Coatings

and Metal

Roofing

What is it?

Roofs can be coated with special materials to increase solar reflection and thermal emission. High-SRI (Solar Reflectance Index) coatings applied to a roof are able to efficiently reject a high fraction of solar heat, creating a “cool roof,” and help to maintain a steady roof surface temperature. A standard roof can absorb up to 90% of solar energy, while a cool roof absorbs less than 50%. The high-SRI coatings contain special reflective white pigments that reflect sunlight away from the roof. They are usually acrylic, silicone, or urethane formulations and can protect roofs from ultraviolet light damage while increasing water protection. There are numerous types of coatings available that can be applied to existing roofs, and you can also buy new roofing material that is pre-coated at the factory. Metal roofing made with recycled steel and treated with a high-SRI coating is an eco-friendly material choice.

Why do it?

Environmental Qualities

Reduces factory energy consumption since roofs do not need to be replaced as often

Reduces greenhouse gas emissions by reducing energy use

Reduces heat island effect

Diverts materials away from landfills by extending roof life

Sealing the roof reduces chemical or particle pollutant runoff

Pros:

SRI coatings can extend roof life up to 15 years

Some utilities offer rebates for cool roofs

High-SRI coatings can reduce energy bills by up to 25%

Improves HVAC equipment performance

High-SRI coated metal roofing may lower insurance premiums

Metal roofing usually comes with 50-year warranty, which reduces roof replacement costs

Contributes to a more comfortable home environment

Cons:

Some cool roofs are more susceptible to mold or algae growth in hot, humid climates

SRI coatings increase the cost of roofing materials

May increase the cost of heating unless other steps are taken to improve energy-efficiency during winter months

Maintenance:

Every roof should be kept free of mold and debris such as leaves and tree branches, and damaged shingles need to be replaced as soon as possible. The reflectance of protective coatings is decreased when the roof is dirty, collects water, or has algae or mold growth.

Timeline:

A high-SRI coating can be applied to a house roof in 2 days.

Steps:

Homeowners should only apply high-SRI coatings when they

are able to safely climb ladders and walk on a roof.

1.Repair damaged roof shingles.

2.Pressure wash or clean the roof’s surface, being careful not to damage the shingles or any other part of the roofing.

3.Make sure that sky lights or other roof penetrations are sealed.

4.Treat any rust on metal roofs or fasteners.

5.Apply SRI coatings with a brush, roller, or sprayer (using conventional spray equipment).

Cost Estimator:

SRI coatings can add $.75–$2.75 per square foot of roofing. The amount depends on the type of roofing material coated— for example, it may cost $1.00 more per square foot to cover existing painted metal roofing, but $2.00 more per square foot to apply on a smooth dark roof surface.

Quick Tips:

✓✓The Cool Roof Rating Council (CRRC) evaluates roof coatings and documents results on consumer produce labels.

✓✓Use a 50% overlap pattern during application. ✓✓Wear rubber-soled shoes, sunglasses, and protective clothing during application for safety.

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