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We highly recomend adding blown in expanding insulation to existing attic spaces. In most homes our BPI Certified Staff can complete this in one day.
Adding this type of insulation fills the voids in the old insulation and after air sealing can reduce your homes energy losses by as much as 50%.
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What exactly is air sealing ?
Any penetration in the thermal boundary of the home. Wiring, plumbing stacks, ductwork, cable entrances, gas lines and etc. Sealing all of these openings and reduce conditioned air losses by as much as 20-50%.
See below the top plate of an interior wall from the attic before and after sealing