Crawlspace Insulation

crawlspace insulation wisconsin

Crawlspaces can cause multiple issues in the main living areas of your home. Oftentimes, these areas have insulation that has been neglected for too long. When not well-sealed, insulated and protected from moisture, crawlspaces can make your home feel cold, drafty and musty-smelling.

Crawlspace Insulation Improves Moisture Control

As part of our top-to-bottom inspection included in WHI's home performance audit, we take a look at the condition and insulation of your home's crawlspace. Insulating a crawlspace is often an "out of sight, out of mind" project, but most people find their homes are more energy efficient and comfortable when the crawlspace is encapsulated and insulated.

What Kind of Insulation?

Since many crawlspaces have dirt floors, WHI usually recommends a 6 mil layer of plastic as a moisture barrier. Dow Thermax™ rigid insulation is a good choice because of its moisture barrier design. Another option once the moisture barrier is laid down is Icynene spray foam insulation, which creates an excellent thermal boundary that can stop home air loss through the floors. The combination of plastic sheeting and insulation is often referred to as "crawlspace encapsulation."

How Much Is Enough Crawlspace Insulation?

Because crawlspaces are not heated or cooled by the home's HVAC systems, they require slightly less insulation: R-10 to R-13 is required to meet federal efficiency codes for new construction, and is a good guideline for proactive insulation upgrade results in our area.

Where Is Insulation Installed in the Crawlspace?

The walls of the foundation, the box sills (where the floor support joists meet the top of the foundation walls), and between the joists on the underside of the floor above are all areas that should be insulated for improved home comfort. If there is ductwork located in the crawlspace that connects to the furnace or central air, the WHI insulation specialist may recommend wrapping it with fiberglass insulation to prevent heat loss.

Best Practices for Pest Control in Crawlspaces and Basements

Your crawlspace or basement is an easy target for mice, rodents, and other pests that make their way into your home. Animals can chew through and ruin the existing insulation in your home, including the crawlspace, creating indoor air quality problems and reducing the effectiveness of your old insulation.

When it comes to proper pest control, any old insulation that’s been damaged by animals or found to contain animal waste needs to be removed and disposed of. Then, a pest treatment company will clean up the area and ensure that pests can’t return. Finally, new crawlspace or basement insulation, like spray foam, will be installed for maximum protection, comfort, and energy efficiency moving forward. Wisconsin Home Improvement partners with a local pest removal company to make this process easy for homeowners! 

Wisconsin Home Improvement: Your Crawlspace Experts

Crawlspaces have unique needs that are best handled by a seasoned professional. As Wisconsin’s only Pearl certified insulation contractor, we’re here to help you insulate your crawlspace properly for benefits like greater moisture control, increased energy efficiency, lower utility bills, and enhanced indoor comfort.


If your home feels drafty or damp or has cold floors, your crawlspace may be the culprit! Contact Wisconsin Home Improvement to schedule an evaluation today.


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  • Teresa

    I am so grateful for everyone at Wisconsin Home Improvement. I will always recommend you to anyone looking to have insulation services.

  • Jenny P.

    I just wanted to extend a thank you to you and all of your employees who have spent time at our home fixing our attic issues.

  • James V.

    Dear Steve, 

    We at Grace are so pleased with the quality of work and the professionalism of the crew that did the insulation. Mike and Igor were so respectful of the building and its contents, and so nice to everyone in the congregation who was working at church. 

    James V., Milwaukee, WI
  • Cindy S.

    I really feel compelled to give a "shout out" to everyone I have come into contact with at WHI. First off - Jody. You are so friendly and helpful on the phone, forgiving me for my inability to "on-line sign", switching up of dates, declining work and then changing my mind.

    Cindy S., Whitefish Bay, WI
  • Tim S.

    Steve, just a side note and I would not send this if it was not completely true - Mike and Pete were both fantastic. I was impressed. We had just had other major construction and have many comparatives for the work WHI did. I would come home and never know they had even been there.

  • Mike & Erin M.

    We wanted to provide feedback on our experience with Peter, who did our home energy audit.  We felt he went above and beyond what was expected of him.  He was very thorough and was genuinely concerned about any issues causing inefficiencies in our home.  He explained things in terms we... Read More

  • I wanted to thank you and your team again for the
    great work you did and insulating our home. It is only been a week, and the
    difference is amazing. Every room in this house feel substantially warmer.

  • Your employees were prompt, courteous and friendly.

    Lois W., Menomonee Falls, WI
  • Thursday and Friday of last week one of your crews were at my home putting in some additional insulation and doing some other work. I just wanted to tell you that my wife and I were very impressed with the professionalism of your men.

    John & Jennifer P., WI
  • Please thank your crew for the great job they did here. They were all very personable, worked very hard, and they took the time to explain what they were doing.

    Barbara F., Belgium, WI
  • Jan and I were amazed and impressed by the crew’s positive work ethic coupled with their gracious and friendly manner. Obviously they knew what they were doing and set to task with quickness and absolute thoroughness… you have our deepest appreciation.

    JoAnne and Jan V., Greendale, WI
  • The work your team did is fantastic! Also I would like to compliment your crew on their professional approach to our house and their work.

    Ryan, WI
  • Steve and Frank are very good representations of your firm -- very professional. Thanks!

    Jim Young, WI
  • We were pleased with work done by Mike and Kevin. They deserve a pat on the back. Thanks!

    Eugene Hefter, WI
  • I just wanted to take a minute to thank you and your Madison crew for the great work they are doing. Over the last few months I have worked closely with Dann, Roger, Marc and Jeremy and am extremely impressed with their attitudes and the quality of their work.

    Brandon Langeteig, Project Home, Inc.
Save up to 73% off insulation, air sealing & ventilation packages while incentives are still available!