Why insulate under a house? Man inspecting crawl space.

Why Insulate Under a House? The Unseen Benefits for Your Home


When considering home insulation, many homeowners focus on walls and attics, often overlooking the under-house area or crawl space. Yet, the question arises: Why insulate under a house? Insulating this often-neglected area can significantly enhance your home’s energy efficiency, comfort, and even its structural integrity. Let’s explore the compelling reasons to insulate under your house and how it can be a game-changer for your living environment.


Understanding the Importance of Under-House Insulation

Energy Efficiency

Adding insulation beneath your house can significantly decrease heat loss during winter and prevent heat from entering in the summer. By establishing this thermal barrier, your heating and cooling systems are relieved from overworking, which can lead to noticeable reductions in your energy bills.

Enhanced Comfort

Cold floors in the winter? That can be a thing of the past with proper under-house insulation. By insulating the under-house area, you also eliminate drafts that can seep through floorboards, making your home more comfortable year-round.

Moisture Control

A well-insulated under-house area helps regulate humidity levels, preventing excess moisture that can lead to mold, mildew, and rot. This moisture control is crucial for maintaining air quality and the structural health of your home.

Pest Deterrence

Insulation materials, especially those designed for under-house applications, can act as a barrier against pests and rodents. This protection helps keep unwanted guests out of your home, reducing the risk of damage and contamination.

Increased Home Value

Investing in under-house insulation can enhance your home’s appeal to potential buyers. Energy efficiency and comfort are significant selling points, potentially increasing your home’s market value.


Choosing the Right Insulation for Under Your House

Types of Insulation

  • Fiberglass Batts: Commonly used due to their ease of installation and cost-effectiveness.
  • Rigid Foam Board: Offers a higher R-value per inch than fiberglass and is excellent for spaces with limited clearance.
  • Spray Foam: Provides insulation and air sealing, ideal for irregular spaces or where moisture is a concern.


Considerations for Installation

  • Ensure that there is proper amount of ventilation in the crawl space to reduce or prevent moisture buildup.
  • Sealing any air leaks is highly recommended, should be performed by an experienced technician before installing insulation to enhance its effectiveness.
  • Consider professional installation for the best results, especially if dealing with spray foam or if your home has specific challenges.


Key Takeaways

  • Under-house insulation is a critical component of a home’s overall energy efficiency and comfort.
  • It offers benefits beyond energy savings, including moisture control, pest deterrence, and potentially increased home value.
  • Choosing the right type of insulation for your home and ensuring proper installation are key to maximizing these benefits.



Insulating under your house can provide a wealth of benefits, from lower energy costs and improved comfort to better air quality and home protection. While it may not be as visible as other home improvement projects, the impact of under-house insulation is felt every day in the warmth and integrity of your home.



This blog post is intended for informational purposes only. Every home is unique, and insulation needs can vary. For a personalized approach to under-house insulation, consulting with a professional insulation contractor is highly recommended.

Interested in learning more about under-house insulation or ready to enhance your home’s efficiency and comfort? Call us today for expert advice and professional insulation services tailored to your needs.