A home’s walls need to endure a lot of battering from weather conditions. As such, proper insulation is key for preventing drafts and air leaking.
In addition, exterior walls act as host to windows and exhaust vents, and thus contain more fenestrations than any other layer of the building envelope. Exterior wall insulation must take into account all windows, doors, vents, and lighting fixtures when it is installed.
While exterior wall insulation is absolutely necessary, it is not as frequently replaced or replenished by homeowners for the simple fact that it is more difficult to install without disrupting day to day home activities. While attics and crawl spaces are relatively secluded, installing wall insulation can be disruptive. While some forms of exterior wall insulation can be installed with minimal disruption, in many cases it is difficult to avoid. It is because of this that adding additional wall insulation is somewhat more expensive than other kinds of home insulation.
Nevertheless, it is equally as important — if not more so for cold climate regions — to inspect and ensure the wall insulation is sufficient for the home’s heat control needs.