Insulating Interior Walls Without Removing Drywall: A Comprehensive Guide

Injection foam insulation is the ideal solution for insulating walls without having to remove drywall. There are several types of injection foam available, including the RetroFoam product, which does not require the drywall to be taken down. You can add insulation to walls without removing it by drilling holes in the coating. Alternatively, you can spray foam or cellulose on the walls from the outside.

Simply cut a 1- to 2-inch hole between the posts at the top of the wall, and then spray the insulation into the hole with a hose. Replace the cutouts, fill them with wood putty, and then sand and paint to restore the coating. This process is time-consuming and expensive. Is there a way to install insulation behind closed walls? The answer is yes! Both injected foam and blown cellulose can be installed without removing the drywall. Foam injection insulation is similar to the individual foam cans that can be purchased at a home center, but on a much larger and much more efficient scale.

Older homes, especially those built around World War II, aren't insulated to the most modern standards, but just about every home can benefit from the addition of insulation. Most contractors use spray foam, which is called “foam insulation for pouring in situ”, as a way to insulate pre-existing walls without removing drywall. However, there is another way to do this. You'll need to check out sources like the North American Insulator Manufacturers Association to see how much insulation you'll need. Rock wool, fiberglass beads, and loose filled cellulose insulation are all good options for this installation process. Spray foam insulation is a more modern and popular type of insulation that can be added without removing drywall.

The Blow-In Blanket System (BIBS) is the trademark of a patented new-construction method for insulating walls with blower-injection insulation that can be used on both open and closed walls. As the insulation penetrates the cavity, contractors will slowly lift the hose to ensure that there is an even distribution of the foam or loosely filled insulation in each part of the space. Loose-filled cellulose insulation starts out as paper and becomes an insulator that fills wall cavities. We recommend using cellulose to insulate pre-existing walls, as it can be installed more easily and with a tighter compaction. In conclusion, there are several ways to insulate interior walls without having to remove drywall.

Injection foam insulation is one of the most efficient methods available, as it does not require any drywall removal. Additionally, spray foam or cellulose can be used from outside of the wall by cutting small holes between posts at the top of the wall. Lastly, loose-filled cellulose insulation is also an option for pre-existing walls as it can be installed more easily and with a tighter compaction.

Perry Holz
Perry Holz

Unapologetic pop culture scholar. Subtly charming zombie evangelist. Certified beer ninja. Award-winning twitter junkie. Avid pizza fanatic.