You've determined that the closed-off walls in your home are missing something extremely important:wall insulation. this is an unfortunate finding, but it is not a problem that you cannot fix. In fact, there are several options for adding insulation in a finished wall. The one option that homeowners tend to lean toward the most is removing the drywall and installing rolled insulation. While this is a good choice, this process of insulating a wall does have its pros and cons, and you should know these good and bad points before making a final decision.
Pro: Lower cost than some other insulation types.
Roll insulation is fairly cheap and does not require any extra tools for installation like blow-in or foam insulation. The price alone is often enough to leave homeowners opting for the method of removing the drywall and adding rolled insulation.
Con: You'll have to actually remove the drywall.
Removing drywall is no joke where work is concerned. Before you even think of removing the drywall, you'll have to take off outlet covers, remove crown molding, and take down any trim pieces or baseboards. Pretty much every sheet of drywall will be held in place by a series of nails, and plus, you will have to disrupt the joints created to cover the seams of the drywall just to take it down. Once the drywall project is complete, you'll have to have a professional drywaller come in to put the walls back in place if you have no experience with this yourself. Additionally, you will have to repaint once the drywall is reinstalled.
Pro: Rolled insulation ensures maximum coverage.
Even though there are a lot of other more modern insulation forms, rolled insulation still is one of the most effective insulation types. Because it is installed by hand, you have the opportunity to visibly ensure every last nook and cranny is filled, which can be hard to do with blow-in insulation.
Con: Removing the drywall for insulation installation is a messy task.
With blow-in or foam insulation, the material is installed through a series of small holes that are cut into the drywall, so the only mess you really have is whatever is the result of cutting those small holes. If you take down the drywall for rolled wall insulation installation, you're going to have a huge mess to contend with. This is not the type of project you can expect to do without disrupting your everyday life at home.