![]() ![]() There are three main types of blown-in insulation. Blowing in additional insulation is an option, but most homeowners forego this step because it’s such a small area. While the plugs are closely matched to the color of the siding, if the siding is brick or stucco, the plugs are often noticeable.Īnother disadvantage of blown-in insulation for walls is that an obstruction in the wall space-such as a drainpipe, an outlet box, or any other type of unseen barrier (for example, a cross-board between studs the builder might have added for stability)-can keep the insulation from filling the entire stud space, leaving a void with no insulation.Īfter a few years, blown-in insulation tends to settle downward by a few inches, which slightly reduces its overall thermal resistance (known as R-value), because it leaves a small section at the top of the stud space uninsulated. 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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