The Importance of Insulation

The Importance of Insulation
by Jon Mitton (Pro Energy Consultants)

One of the buzz words in today’s “Green” community is insulation. People everywhere are talking about improving insulation and how it can benefit the environment. Let me tell you it is very true but where do you begin? What are the differences in the types of insulation and what should you be using? Let’s briefly review the 3 main styles of insulation and some of the pros and cons of each.

Fiberglass Rolled Batt (pink stuff) – this is the most standard type of insulation seen in homes today and is still widely used even in new construction. Under the ideal conditions this insulation performs as it is intended but if any air flows through the insulation it loses all of its insulation properties and R-value. Basically, it is the equivalent of a mesh shirt that feels great and comfortable but does nothing to help keep you warm in a breeze. The advantage of this insulation would be ease of installation, inexpensive and readily available. The main disadvantage would be improperly installed it does not meet its stated R-values.

Dense Pack Cellulose (recycled & treated paper goods) – this is becoming the new standard in the market today and it is used extensively in existing walls. It is ideal when properly installed as it provides a substantial air barrier and higher R-value. The number one concern with dense pack cellulose is that it needs to be dense packed to be effective. Cellulose would be equivalent to a fleece jacket blocking some of the air flow and keeping you warm. Because cellulose is installed from the outside with minimal disruption to the home it has a key advantage in existing wall improvements over most other types of insulation. The main disadvantage is improper installation which can result in settling within wall cavities over time creating cold wall surfaces close to the ceilings.

Spray Foam / Injection Foam (usually polystyrene) – For new construction with open wall cavities it is one of the best available options. Due to extreme expansion of spray foam it is not an option for existing closed wall improvements. Injection foam is designed for use in closed walls as it has no expansion properties. Foam insulation has a much higher R-value and provides a thorough air barrier as well as excellent insulation properties. Foam insulation is the equivalent of wearing a ski parka with both blocking the wind and keeping you warm. A distinct advantage to using spray foam would be, during installation, it completely fills all potential air penetrations within the wall cavity. Though, in the event you choose to relocate or add wiring to a foam filled cavity it may damage the foam barrier and would be a key disadvantage which should be considered.

Improving insulation in the home allows you to keep the expensive heated air in the home and not heating the neighborhood. Additionally, your heating system will not have to work as hard to compensate for the excessive heat loss. This will save you money, save fuel and save the environment.

Make sure you consult a professional to determine which insulation is right for you.