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Retrofitting a house means upgrading it so it will "keep the heat in". During this process, small holes are drilled between wall studs and loose fill insulation is blown into the empty cavities. The holes are patched when completed. Loose fill insulation is a material called cellulose.
This material can conform to any space without disturbing the existing structure (e.g. pre-existing enclosed walls).
This allows for the benefits of an upgrade without the inconvenience of a full scale remodel.
Drill and fill insulation can be installed internally through the home or externally through the outside of the home. Our trained technicians can insulate through drywall, brick, veneer, vinyl siding, lap wood siding, shipboard siding, wood based sheet siding, masonry, non-wood siding, stucco, gypsum board, plaster/lath and tile.
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Cellulose and fiberglass are the two most popular types of blown insulation, and they each have some pros and cons. Here are some details on the differences between cellulose and fiberglass insulation.
Cellulose and fiberglass have similar insulating values. Although cellulose does have a slightly higher R factor (cellulose has an R-value of approximately 3.0 per inch while fiberglass ranges from R-2.1 to R-2.7), cellulose will settle over time, potentially leaving some areas (in walls particularly) with little or no insulation. Fiberglass manufacturers have developed blown fiberglass insulation they claim won't settle over time.
Cellulose retains its insulating value no matter the temperature, however, fiberglass has been shown to lose some of its insulating value as the temperature drops. In extreme temperatures, the loss of insulating value can be as much as 50 percent.
Loose-fill, or blown, cellulose insulation is manufactured primarily from recycled newspapers, a very benign product, so it poses virtually no ongoing health risk.
Blown fiberglass, on the other hand, is made up of very fine strands of glass, and these tiny fibers are a carcinogen that can easily be inhaled into your lungs. To offset this potential health concern, fiberglass insulation is usually covered with something after it's installed, or it's installed in an area where it won't be disturbed (such as an attic), so the fibers won't get into the air where they could be inhaled. With these precautions, it's no threat to your health.
Since cellulose is made from newspaper, it obviously will burn. Cellulose insulation manufacturers have responded to that concern by treating it with fire-retarding chemicals such as boric acid, ammonium sulfate, or sodium borate in the manufacturing process. These chemicals have the additional benefit of repelling mice and other rodents.
Fiberglass, on the other hand, because it's made from glass, simply won't burn (although it will melt at extremely high temperatures).
Cellulose contains the higher percentage of recycled materials. While the fiberglass industry does a good job of recycling and uses approximately 35 percent recycled material, cellulose manufacturers average over 75 percent recycled content.
Fiberglass insulation has proven over the years to provide effective temperature and sound insulation while more recently, cellulose has established itself as a viable alternative. Since either will do an effective job insulating your home, the insulation you choose should be based on other factors such as cost and availability of the product, quality and reputation of the installers (if you're not doing it yourself), and your personal environmental concerns.