Blown In Insulation
Blown In Insulation Advantages
Blown-in insulation is available in 2 primary forms, fiberglass and cellulose. It can installed in a loose fill form in attics or in a BIBS/dense pack system in wall or floors. Blown in fiberglass has an r value of 2.2-3 per inch loose fill and up to 4.0 per inch in BIBS system. Blown in Cellulose has an r value of 3-3.5 per inch loose fill and up to 4.0 per inch in dense pack use. Blown in insulation has lower up front costs than spray foam. When installed properly, blown in insulation had many benefits over batt insulation. It fills cavities full and does a much better job limiting air movement compared to conventional batt insulation.
Loose Fill vs BIBS/Dense Pack
Loose fill blown in is just that, loose filled. This is what is used in attics. Using an insulation blower machine, cellulose or fiberglass is blow into your attic over a poly vapor barrier at thicknesses up to 20 inches to reach needed R values. BIBS (blown in blank system) or dense pack is used for wall systems or floors between levels. A fabric is tightly stapled to studs and material is blown into each stud cavity. Because the fabric is holding in the blown in insulation, it can be installed in a dense form vs loose fill. This dense packing fills all voids and reduces air flow in the cavity. This makes it more affective per inch as well as prevents and settling of the insulation over time. Then a poly vapor barrier is installed over the fabric.