The Importance and Benefits of Proper Crawl Space Insulation

Although proper insulation is a priority for many homeowners, out of sight usually means out of mind, which might be the case with your crawl space. If your floors feel cold even when your thermostat is set high, odds are your crawl space needs some added insulation. Ensuring proper insulation of the crawl space serves to enhance both the comfort and energy efficiency of your home.

Although optimal crawl space insulation is necessary and beneficial, some homes do not have any insulation in the band board area or on crawl space walls. In such a case, installing spray foam from the home’s floor down to the polythene vapor barrier would be wise. To help you grasp the importance of proper crawl space insulation, here’s a look at the benefits offered.

Improved comfort

Any room above a ventilated or unventilated crawl space is usually colder or warmer than the rest of the house and therefore quite uncomfortable. Lack of proper crawl space insulation is often the culprit. You can achieve optimal insulation by blocking off all the vents and installing vapor barrier and spray foam. Insulating your crawl space helps regulate the temperature, leading to fewer drafts in the rooms above. With proper insulation, your crawl space and living space will maintain similar temperatures and levels of humidity. In fact, a well-insulated crawl space can make your floors as much as 10-20 degrees warmer.

Better indoor air quality

Because crawl spaces are often dark, dank, dusty, musty, and moist at the same time, these underground spaces can provide a natural breeding ground for mold, insects and rodents. During the heating season, about 50 percent of your indoor air comes from your crawl space or basement area. Crawl spaces that do not have insulation usually mean poor indoor air quality, which might, in turn, lead to a variety of health issues.

A well-insulated crawl space makes it a lot harder for allergens and other irritants to get into your ventilation systems, which helps to ensure your indoor air stays as clean as possible. Additionally, proper insulation helps protect the walls and ductwork, keeps the bad air out, and reduces the level of humidity. A correctly installed crawl space insulation system is particularly useful if you live in an area known for heavy amounts of pollen and other allergens.

Energy efficiency

In order to regulate your indoor air, your HVAC unit has to work harder whenever there’s a condensation build up or duct leak in your crawl space, which means overcompensating. Unfortunately, overcompensation often leads to significant loss of energy and system inefficiency. Combining proper insulation with a high-functioning ventilation system reduces outside air infiltration and regulates the atmosphere of your crawl space. As a result, overcompensation will no longer be required of your HVAC system.

Save money

By enhancing the efficiency of your HVAC units and reducing the amount of energy consumed, proper crawl space insulation allows you to enjoy greater savings on your monthly bills. Additionally, effective vapor barriers, venting and insulation can help decrease the need for pest control services by providing a proactive defense against pests. Added crawl space insulation keeps the cold or warm air from escaping. As a result, your HVAC system won’t have to work as hard, and allowing it enough rest helps to ensure optimal performance and longevity. Also, a reduced need for HVAC repair or replacement services means less money spent.


Energy Star tagged proper crawl space insulation one of the most effective ways to save energy, second only to the insulation of attics. Besides taking a short time to complete, proper crawl space insulation usually means a much healthier, significantly more comfortable, and highly energy efficient home.

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