LYCOS RETRIEVER 
Insulation
built 256 days ago
Insulation performance is measured by R-value — its ability to resist heat flow. Higher R-values mean more insulating power. Different R-values are recommended for walls, attics, basements and crawlspaces, depending on your area of the country. Insulation works best when air is not moving through or around it. So it is very important to seal air leaks before installing insulation to ensure that you get the best performance from the insulation.
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Insulation around a bridge is of little help in preventing heat loss or gain due to thermal bridging; the bridging has to be rebuilt with smaller or more insulative materials. A common example of this is an insulated wall which has a layer of rigid insulating material between the studs and the finish layer. When a thermal bridge is desired, it can be a heat source, heat sink or a heat pipe.
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Insulation consists of a variety of materials and comes in many forms. These include fibrous insulation, foam insulation, insulated panels, straw panels, and insulating masonry products, as well as specialized devices to aid proper insulation techniques. Alternatives to conventional fiberglass, cellulose, and mineral wool are constantly being explored and introduced to the market place. These new types of insulation serve different needs. The following describes the new insulation types without manufacturer or product name unless it is needed to convey an adequate description. In order to convert English (Imperial) unit R-values into metric (International System units, or SI) equivalents, you can use the conversion factors listed before the bibliography.
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Spider™ Custom Insulation comes in variable thickness levels can fill 2x4 cavities up to an R-15 thermal rating, 2x6 cavities up to R-23, and six-inch steel stud cavities up to R-25. Spider™ insulation ... reduces sound transmission, achieving a Sound Transmission Class of 43 in a standard 2x4 wood-framed wall. Spider™ insulation resists mold because it sprays in almost dry (less moisture content than wood framing), and is treated with a U.S. EPA-registered mold inhibitor to protect the insulation against mold. Spider™ insulation can be used for both wall and ceiling applications. In addition, only fiber glass insulation made without formaldehyde—such as Spider™ Custom Insulation—can pass Environmental Specification 1350, the toughest indoor air quality test in North America, with a non-detect for formaldehyde.
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Insulation for the home has been readily improved through the years. Both fiberglass and cellulose insulation, in batt or blown in insulation form, have certain advantages as well as traits that need special diligence. Assure proper R-value--and your own safety, by reading these guidelines and tips.
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Insulation is rated in terms of its resistance to heat flow, called R-value. The higher the R-value, the greater its thermal resistance. The R-value of thermal insulation depends on the type of material, its thickness, and density.
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