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A BIBS installation has no chemical treatments, so it will not offgas or release harmful chemicals into the air like some treated cellulose products. It is completely inert and will not support moisture, fungal growth, or provide food for insects or animals. It is non-corrosive and will not contribute to the rusting or deterioration of pipes or studs. It is fire resistant and provides superior sound control.
The first step is to enclose the wall and ceiling cavities with a BIBS fabric. This fabric creates an enclosure and holds the blown-in fiberglass in place. Unlike the netting that is used with other blown-in applications, the BIBS fabric is breathable but does not have the holes that allow insulation fibers to escape. In new construction, this fabric makes insulating all faces of the home possible, even in cathedral ceilings that do not have insulating attic space above them. Blow-in-blanket installations are also possible in retrofits, where there is no fabric to encase the cavity. In this case, contractors use a table to calculate the number of bags required to fill the cavities to the prescribed density.
The insulation contractor fills each cavity to a two-pound density. Installation is very quick with much less mess than traditional blown-in or sprayed-in insulation applications because woven fabric is used instead of netting, the cavity is enclosed, and adhesive need not be sprayed in along with the fiberglass to ensure against settling. With the Blow-In-Blanket system there is an expense up front that brings a payback in energy savings in just one to four years, depending on the region and local energy costs.
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