Cavity Wall Insulation: Pros and Cons

An old, red-brick wall.

Wall insulation is beneficial because it helps prevent heat loss. This means that not only will your house stay warmer, but you will also end up paying less for your heating bills. What's more, effective wall insulation is a great way to lower your carbon footprint.

Pros of Cavity Wall Insulation

You'll probably need a professional to install cavity wall insulation, but you won’t have to tear out drywall or install batting. The contractor will drill holes in the outside wall and pump in the insulation using specialized equipment.

Some areas offer incentives to insulate your house, so you might be able to obtain a grant that will help lower the cost, thus making cavity wall insulation an affordable alternative. If you use mineral wool insulation with a low R-value, the insulating factor will be much higher. As long as you use a reputable, experienced contractor, the cavity in the wall should be filled evenly so there will be no cold spots where heat can escape.

Cavity wall insulation can be installed very quickly. Depending on the size of your house, the work will be finished in a few hours, and only rarely will it take more than a day to cover the entire home. The installation procedure is not messy either. The contractor drills through the wall and, when all the insulation is in place, replaces the plugs such that it's often impossible to tell there have ever been any holes made.

Cavity wall insulation will pay for itself in a reasonably short time. You should notice the difference in your energy bills immediately, and the house will feel warmer from the very first day.

Cons of Cavity Wall Insulation

There are only a few disadvantages to cavity wall insulation and they involve installation. Since the insulation expands to fill the entire cavity, you can experience problems with mold and mildew if the entire cavity isn’t filled correctly, and it can difficult to tell this until a noticeable problem arises.

You also need to make sure that your walls are not damp. It’s well worth spending the money to have them inspected first and take care of any problems.