![]() Roofing faces a variety of environmental challenges, but hail, high winds, and wildfire are certainly among the most difficult tests. ![]() Manufacturers may use the metal’s gauge as a measurement-the lower the number, the thicker the material. to 0.05 in., depending on the profile and the type of metal. Metal thickness ranges from about 0.014 in. Zinc is another option with an extremely long service life-hundreds of years, according to Bus-but it’s never been as popular as copper in the U.S. The best known is probably copper, with installed costs around $2000 per 100 sq. There are several other choices, all of them more expensive but also extremely durable. Aluminum is slightly more expensive-7% more than the steel roofing leaving his plant. ![]() In “aggressive” environments-along the coast or in regions with highly acidic rain-aluminum is less likely to corrode, and if the surface is scratched, the panel won’t rust. McElroy cites a side-by-side comparison in which Galvalume- coated panels were two to four times as durable as galvanized steel after 23 years of weather exposure.īus prefers aluminum as the base metal over steel (his company manufactures both types). The treatment is especially useful in harsh weather conditions. In this process, bare steel is coated with an alloy of zinc and aluminum (generically, this coating is referred to as an AL-Zn alloy) before it’s painted or clear-coated. Galvalume is another, and widely regarded as better, option. ft.) makes a long-lasting substrate for roofing, says Ken Gieseke, vice president of marketing at McElroy Metal, a Louisiana-based manufacturer. One way to prevent it is to galvanize it by adding a coat of zinc to the surface before painting. Steel’s weakness is its potential for rust. “On the other 20%, it tends to be driven by climate in that area.” “On about 80% of all homes, either metal will work just fine,” says Todd Miller, president of Isaiah Industries, a manufacturer of a wide range of metal roofing products. Steel and aluminum are the two most common and least expensive metals used for residential roofing. But its longevity, recyclability, high fire resistance, and low maintenance has increased its acceptance. A standing-seam or metal-tile roof can be two or three times the initial cost of asphalt. Metal roofing may never catch up to asphalt in the residential arena simply because of sticker shock. “Those myths are gone, and people want to reroof with something that has some permanence to it,” he said. The industry is also working harder to win over consumers who once thought that metal roofing was too hot, too heavy, noisy, or prone to rust, says Dick Bus, president of ATAS International and head of the Metal Roofing Alliance. Paint and stone coatings are more sophisticated and durable, giving metal roofing a long service life while appealing to homeowners with a variety of aesthetic preferences. What happened? Metal roofing is now available in a range of styles-from standing seam to a variety of stamped metal shingles that look like slate, clay tile, and even asphalt. That number has roughly quadrupled since then, according to an industry trade group. Metal roofing has a long history in the U.S., but until 20 years ago it was a bit player in residential construction, with just a 3.6% share of the reroofing market. The article includes explanations of rating standards for metal roofing, as well as descriptions and pricing for a variety of roofing products, from modular panels made to look like shakes, shingles, and tile to classic standing-seam or through-fastened panels. Contributing writer Scott Gibson delves into all the different options for metal roofing, from materials to installation details. Synopsis: Metal roofing is growing more popular due to a widening range of styles available and longer service life.
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