The hole is then sealed with a plug that matches the siding. To install blown-in insulation in existing walls, holes are drilled at the top of each stud space (usually on the exterior), and material is blown in via a long, flexible hose. Blown-in wall insulation has a few disadvantages in terms of coverage and aesthetics. And in addition to creating an insulating blanket, blown insulation helps reduce sound transfer between the outdoors and the indoors, so unwanted street noise will also be softened. What’s more, this type of insulation can also seal small gaps and spaces as it settles, filling these sneaky spots where cold air would otherwise come in. Blown-in insulation can be added to attics and walls without the hassle. Installing batts in most existing homes, however, is rarely feasible, as drywall would have to be torn down, a messy, expensive, time-consuming proposition. Blown-in insulation fills between existing wall studs and ceiling joists quickly and easily.ĭuring new construction, batt insulation-thick strips of spun fiberglass or a paper-based product-is cut to fit between wall studs and ceiling joists before wallboard is put up to increase insulation values.
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