Crawl Space Insulation: What You Should Know

Insulation in your basement crawl space can make your whole house more efficient. Here's how to install it in your space.

Crawl Space

Photo by: unknown

unknown

By: Caroline Shannon-Karasik

Related To:

Crawl space insulation, as a part of overall home air sealing and insulation, helps maintain your entire home's energy efficiency. Without insulation, heat and cool air are easily lost through the floor. Insulation also helps to preserve the air quality and reduce energy costs. There are two types of crawl spaces - ventilated and unventilated - and each requires its own form of insulation. The goal, however, is the same: to enclose the space in a thermal envelope.

Rustic and Refined: Unfinished Basement Overhaul

See All Photos

Shop This Look

If the crawl space is ventilated, which is ideal because it aids in the elimination of moisture, then fiberglass insulation can be easily installed under the subfloor between the floor joists. It is important to secure insulation and cover it with a vapor barrier in order to prevent moisture and the mold that often follows close behind.

If your crawl space isn't ventilated, insulate the walls of the crawl space rather than the subfloor of the room above. This requires less insulation and will eliminate the need to insulate ducts and pipes, separately.

You may also want to install a polyurethane vapor barrier over the dirt floor for further protection. The barrier may be covered with sand to keep it from getting damaged.

While crawl space insulation may be installed by a handy homeowner, you might consider using a professional. They'll clean up and properly dispose of old insulation and often spray the space with bacteria - and fungicides.

Next Up

Top Six Basement Spaces

From media rooms to home offices to bars, get tips on transforming your basement.

Carpet and Carpet Tiles for Basements

Carpet can be a difficult flooring choice for basements given its natural ability to absorb water. But with the right guidance it is possible to have a comfy basement floor.

How Much Value Does a Finished Basement Add?

A finished basement is a home improvement project you get to enjoy twice: for the added living space, and again at resale when you're paid back for much of the project.

Insulating Attic Access

Learn how to fill up attic spaces effectively.

How to Re-Cover Metal Columns in Wood

If the columns in your home are all function and no style, then dress them up. Learn how to install a simple wood wrap to turn boring columns into cool architectural features.

How to Build Finished Walls in a Basement

Looking to finish your basement and turn it into extra living space? Learn the steps and costs needed to turn cinderblock walls into finished walls.

How to Insulate an Attic

Whether your attic is finished or unfinished, choosing proper insulation requires a fair amount of planning. Learn more about batts-and-blankets, rigid foam and loose-fill insulation options that will help keep your house warm in the winter and cool in the summer.

Determine Your Storage Needs

The items you want to store will help determine the best storage solutions for your mudroom.

Designer Tips for Hanging Storage

This type of mudroom storage gives you quick retrieval of coats and bags as you head out the door.

How to Build Rolling Garage Storage Shelves

Custom garage storage can cost a pretty penny. Luckily, we’ve got the perfect DIY garage shelves project for you.

Go Shopping

Get product recommendations from HGTV editors, plus can’t-miss sales and deals.

On TV

Follow Us Everywhere

Join the party! Don't miss HGTV in your favorite social media feeds.