One of the most important things you can do to protect your home is insulate it. You may already know that insulating crawl spaces is an important part of this process. Crawl space insulation helps to prevent air flow, which keeps your home warmer and also reduces energy costs.

In addition to keeping your home comfortable, it also helps to prevent mold growth, which is a serious health concern in homes with poor air quality. Here’s everything you need from Premiere Insulation to help you understand how crawl space insulation works and different Crawl space insulation ideas.

Why Is Insulation In Your Crawl Space Important?

Insulation in your crawl space is important for a variety of reasons, including:

  • Saving you money on utility bills.
  • Keeping your home comfortable year-round.
  • Protecting your crawl space from moisture that could lead to mold or mildew growth.

What Types of Insulation Are Commonly Used For Crawl Spaces?

The three most common types of insulation used in crawl spaces are:

  • Fiberglass: Fiberglass insulation is made from glass fibers with a coating of plastic on one side. It is lightweight, has a high R-value, and is inexpensive to install.
  • Cellulose: Cellulose insulation is made from recycled paper or cardboard. It is slightly more expensive than fiberglass insulation, but it also has a high R-value.
  • Foam: Foam insulation is made from polystyrene and is the most expensive type of insulation to install. It's also the most effective type of insulation for use in crawl spaces.

5 Crawl space insulation ideas

  • Insulate the walls: As you may have guessed, the wall is your best friend when it comes to crawl space insulation. A layer of fiberglass or rock wool will keep the cold air from seeping in and can also help prevent mold growth. Insulating your walls is super easy. Just staple 3-4" of insulation over top of them with plastic sheeting for protection.
  • Insulate under concrete slabs: If your crawl space has a concrete slab foundation, be sure to isolate any cracks between it and the earth so that heat doesn't escape from underneath at night. This can be done by placing insulation between joists or using foam board as a base layer before adding more insulating material on top. Just make sure there's some ventilation near those vents!
  • Use plastic sheeting: If you're going to do any sort of digging around in your crawl space, then covering up all exposed dirt beforehand with plastic sheeting should stop any unwanted pests from getting in while also keeping moisture levels down below ground level.
  • Consider closing off holes where pipes go into surfaces like concrete block walls:This helps keep out rodents who might find these places appealing due to their warm temperatures.
  • Seal off air vents completely if possible:If not possible then use screens instead of mesh wire which allows for better filtering capabilities by keeping out dust particles but still allowing some airflow through it so that condensation doesn't build up inside.


Hopefully, you’ve learned something new about crawl space insulation. If you have any questions, feel free to contact us! We have years of experience working with homeowners and contractors alike. We look forward to helping you make your home more comfortable this winter season by insulating your crawl space.