Everything You Need to Know about Crawl Space Insulation


Insulation plays a huge role in keeping your crawl space in optimal condition. There are many different crawl space insulation methods, with sub-floor insulation being the most popular. Unfortunately, we come across poorly-installed sub-floor insulation far too often.

That’s why it’s important for you, the consumer, to be informed. To that end, here’s everything you need to know about crawl space insulation:

Installation methods

Usually, crawl spaces are insulated with standard fiberglass batted insulation, which is placed in the joist cavities. We call this sub-floor insulation. In the Northeast, the insulation must have at least an R-19 rating.

Most codes also now allow insulation to be placed vertically on the foundation walls, as long as it meets the requirements for fire and smoke spread. It’s usually done with a ridged Styrofoam board several inches thick.

In some cases, newer reflective foil insulation is used as a supplement. This helps it achieve the required R values. Some types of this insulation can also serve as a vapor barrier.

Common crawl space insulation problems

There are two common problems that usually need to be corrected:

  1. Insulation is installed upside down
  2. Insulation is not secured correctly

EnviroGreen Boston can fix your crawl space insulation issues! Our technicians have seen it all, and will be able to quickly get your crawl space in good shape. Call us today at (844) 775-7700 to schedule a FREE crawl space inspection! We’ll discuss available options with you, and provide you with the best and most cost effective solution to your crawl space problems.

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