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These small particles form an insulation material that
can conform to any
space without disturbing any structures or finishes. This ability to conform
makes Blown insulation well suited for retrofits and for places where it's
difficult to install some other
types of insulation.
Dynamic renovations in dedicated to giving you an affordable option for insulation installs. The most common types of materials used for Blown insulation include cellulose, fiberglass, and mineral (rock or slag) wool. All of these materials are produced using recycled waste materials. Cellulose is primarily made from recycled newsprint. Most fiberglass contains 20%–30% recycled glass. Mineral wool is usually produced from 75% post-industrial recycled content.
Blown insulation can be placed in ether unenclosed spaces, such as attics, or enclosed spaces like walls. Installation usually involves using a special type of equipment that will blow the insulation into the cavity or space. This includes the "two-hole method," which is when two holes are drilled vertically into the exterior stud.
Over time, Blown insulation can lose its R-value because of settling, especially in attic cavities. Cellulose settles more than rock wool or fiberglass—20% compared to 2%–4%. Therefore, if you use cellulose, install 20% more in an attic to offset the settling. Cellulose manufacturers are required by federal law to provide the "settled thickness" on their bags. Some even provide the "installed thickness."
Researchers say it's possible to install Blown insulation in wall cavities without settling. If the cavity is completely filled with insulation at the proper density, no significant settling should occur. A general density guideline for walls is roughly 3.5 pounds per cubic foot (17 kilograms per cubic meter) of wall cavity for cellulose and 1.5 pounds per cubic foot (7 kilograms per cubic meter) for fiberglass or rock wool. These specifications are roughly twice the density of horizontal applications.
Here's an easy-to-follow guideline to ensure that wall cavities are
being filled at a density sufficient to prevent settling: use roughly
one 30-pound (13-kilogram) bag of cellulose or about 15 pounds (8
kilograms) of fiberglass or rock wool for every three wall cavities you
fill. (Assumptions: 8-foot [2.4-meter] walls, with 16-inch
[41-centimeter] on-center wall cavities, and 2x4-inch framing studs.)
Here are some more examples of Blown Insulation
Here are some examples of how Blown insulation is installed
Info. per Department of Energy
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