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Pros and Cons of popular roofing materials

 

Popular Roof Materials

What most homeowners desire is a roof that's not too expensive, requires no maintenance, and lasts forever. But most roofs are replaced - or at least repaired - every ten years. By carefully choosing your home's roofing material, you can reduce the cost of replacement. In the long run, you'll use less building material, fill up less landfill space with discarded material, and put less demand on our natural resources.

Composition shingles

comp shingles

Composition shingles are a good choice for a clean look at an affordable price. Higher-quality versions made from asphalt or fiberglass shingles offer a more durable option and may be available with recycled content. Composition shingles come in a large selection of types, brands and colors. Versatile, they adapt easily to different applications. They are relatively easy to install, and in some applications can be nailed in place over an existing roof. They require low maintenance and can be walked on without damaging the material. Most brands offer Class A fire protection.
On the negative side, they can blow off in high winds. Material is easy to scar if hot. Does not have the dimensional look of tile or shake.

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Wood Shakes

wood shakes wood shake

Wood shakes offer a natural look with a lot of character. Because of variations like color, width, thickness, or cut of the wood, no two shake roofs will ever be the same. Wood offers some energy benefits, too: it helps to insulate the attic, and it allows the house to breathe, circulating air through the small openings under the felt rows on which wooden shingles are laid.
A wood shake roof, however demands proper maintenance and repair, or it will not last as long as other products. Mold, rot, and insects can be a problem. The lifecycle cost of a shake roof may be high, and old shakes can't be recycled.
Most wood shakes are unrated by fire safety codes. Many use wipe or spray-on fire retardants which offer less protection and are only effective for a few years. There are pressure-treated shakes, however, that are impregnated with fire retardant and meet national fire safety standards. Made by companies like Chemco, this pressure treating extends the life of wood shingles and provides better fire safety performance. Installing wood shakes is more complicated than roofing with composite shingles, and the quality of finished roof depends on the experience of the contractor as well as the caliber of the shakes you use.
The best shakes come from the heartwood of large old cedar trees. Care should be taken when selecting shakes as the quality varies greatly from different shake mills.

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Clay Tile

clay tile Clay roofing tile is a good choice for homes with a southwestern, Italian, or Spanish Mission design, or even for homes with a modern, clean look.
Tile lasts a long time - its expected lifespan is greater than the lifespan of the material on which the roofing rests. Tile won't rot or burn, and it can't be harmed by insects. It requires little maintenance, and comes in a variety of colors, types, styles and brands. The biggest drawback to clay tile can be its weight. Depending on the material used to make it, tile can be very heavy - so heavy that extra roof support can be required. With some new materials, however, color is added only on the surface of the tile, and they can fade over time. Although most modern tile is kiln-fired into the tile making the color permanent.
Tiles are fragile, so walking on them can break them. That makes it more difficult to accomplish maintenance like painting or cleaning rain gutters or fireplaces. Initial installation can be more complicated than other roofing materials.

Finally, tile can cost more than other roofing materials.

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Slate Roofing

slate roofing Slate - actual shingle-like slivers of rock - is another roofing material that shows up on more upscale homes. Although slate is an expensive choice, it offers a very natural look and can be laid out in a variety of patterns.
The benefits of slate are identical to those of tile: a very long lifespan, good fire protection, low maintenance, and an invulnerably to rot and insects. It comes in a good selection of sizes and colors, although colors are limited to those found in nature.
Like tile, slate can be very heavy, sometimes requiring expensive extra support. It, to, is breakable enough that walking on it is difficult for a non-professional, complicating such tasks as rooftop maintenance, gutter cleaning and painting.

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Concrete Tile

concrete tile

Concrete Tile is now a roofing material. Shingles, simulated wood shakes, lighter-weight tiles and concrete panels are being manufactured from a variety of fiber-reinforced cement products. Some are coated with plastics, enamels, or thin metals, and some contain recycled material. Although the products themselves are not yet recyclable, they are a good choice for durability and resource efficiency. The advantages of concrete roofing vary from product to product, but generally they all have a long lifespan, require low maintenance, offer good fire protection and are resistant to rot and insects. Many tiles mimic the appearance of wood shakes, while improving on the durability and fire protection that real wood affords. It can approximate the look of clay tile or slate while mitigating the structural problems caused by the weight of the real material.

Concrete is more expensive than some roofing materials, and early types of concrete roofing had problems with the material curling, breaking and changing color. Technology has improved, however, and these problems have mostly been overcome. Style and color choices are expanding, and by mixing the cement with additives, manufacturers and making lighter and lighter products.

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Metal Roofing

Metal roofing metal roofing

Metal Roofs are coming back into vogue. In the late 1700s, zinc, copper, and lead were the most popular materials used for roofing - such famous historic buildings as the Washington Monument and Thomas Jefferson's Monticello have metal roofs.
Standing-seam steel roofing is the most popular residential metal roofing today. (The term standing-seam describes the upturned edge of one metal panel that connects it to adjacent sections, creating distinctive vertical lines and a trendy historical look.) But metal roofs can also be made to resemble wood shakes, clay tiles, shingles, and Victorian metal tiles. Aluminum or coated steel is formed into individual shingles or tiles, or into modular panels four feet long that mimic a row of shingles or tiles.
Metal roofs are durable, fire retardant and almost maintenance-free. They are also energy efficient; metal reflects heat and blocks its transfer into the attic. Research by the Florida Solar Energy Center in 1985 showed that metal absorbed 34 percent less heat than asphalt shingles, and homeowners switching to metal roofing reported saving up to 20 percent on their energy bills. Steel roofs offer other environmental benefits as well. They are made from between 60 percent to 65 percent recyclable material. Because they weigh very little, metal roofing can be installed over existing roofs, eliminating the need to dispose of excess material in a landfill.
Installing some metal roofing can be an intricate process best done by a professional, and the initial cost of a premium metal roof is higher than most other roofing materials. You need to compute the lifecycle cost to see if paying more to begin with for a metal roof will prove to be a better investment than some other form of roofing.

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Hot Mop Roofing

hot mop roofing

Hot Mop Mostly seen in commercial applications, hot mopped asphalt roofing is sometimes applied to flat or semi-flat residential roofs that have good access and proper drainage. Asphalt's advantage is that it is less expensive than other roofing materials and holds up fairly well when properly applied. The technique results in a roof that's not very pretty, although in residential use it is often covered with a layer of decorative stone to improve the appearance. You've no doubt noticed roofing projects that use this technique, since it requires a large kettle of melted asphalt. When being applied, the hot mixture releases extremely high levels of smelly air pollutants. In addition to being unpleasant, the hot asphalt poses a health risk to installers. Because its fumes contribute to smog, hot mopped asphalt may be restricted in some urban areas.

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Be Wary, One final note

Many of the high end, man made roofing materials made in the last 10-15 years have failed prematurely. Most of these materials promised 50 year warranties. Many homeowners are stuck with failing high dollar roofs, and are involved in class action law suits Be careful in selecting materials that do not have a proven track record. Investigate thoroughly. Also see Cheating Roofing Contractors


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