There is no doubt that adding interior wall insulation is the smartest decision you can make, especially since this endeavor will not only prevent the heat loss in winter or make your space pleasant enough during hot summer days, but it will also improve its acoustic performances and add protection regarding fire risks.
Now, what’s essential to know when it comes to wall insulation is how thick the insulation for walls should be in order not to create the opposite effect. The more the merrier approach is not something that can be applied in this matter. According to professionals, if you install too much insulation you can end up with a colder house since you risk losing small tiny pockets of air, which are the thing that keeps the warmth inside the walls and therefore the space.
In most cases there are two wall types all houses are built from, and they need different insulation. Older homes are usually designed with 2x4 interior walls, and the best insulation option for them are R-13 and R-15 fiberglass rolls. On the other hand, the best insulation for walls in modern buildings that are usually 2x6 thick is R-19 and R-21 fiberglass, since they can make sure that the insulation on interior walls is not too tight nor too loose.
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