Spray Foam vs. Fiberglass: Which Insulation Is Right for Your Project?

When it comes to home insulation, choosing the right material can make all the difference in comfort, efficiency, and long-term value. Two of the most popular options on the market today are spray foam insulation and fiberglass insulation — but they’re not created equal.

At HomeWise Energy, we often get asked: "Which insulation is better?" The answer depends on your specific needs, budget, and the areas of your home being insulated. In this post, we’ll break down the key differences between spray foam and fiberglass to help you make an informed decision.

What Is Spray Foam Insulation?

Spray foam insulation is a liquid material that expands into a thick foam when applied. It comes in two types:

• Open-cell: Less dense, softer, and provides sound dampening.

• Closed-cell: More rigid, water-resistant, and offers a higher R-value.

Spray foam acts as both insulation and an air sealant, filling cracks, gaps, and hard-to-reach spaces.

What Is Fiberglass Insulation?

Fiberglass insulation is made from fine strands of glass woven into a mat or loose-fill form. It’s typically installed as batts (pre-cut panels) or blown-in material.

Fiberglass is known for being:

• Cost-effective

• Widely available

• Easy to install in standard wall cavities

  
  

When to Choose Spray Foam

Choose spray foam if:

• You’re looking to maximize energy savings

• You want air sealing and moisture protection

• You’re insulating irregular or hard-to-reach spaces

• You have long-term energy goals or are building a high-performance home

HomeWise Energy often recommends spray foam for attics, crawl spaces, rim joists, and new builds where maximum efficiency is a priority.

When to Choose Fiberglass

Choose fiberglass if:

• You're looking for a budget-friendly insulation option

• You're working on a standard retrofit or remodel

• You’re insulating accessible areas like walls or ceilings

• You need a quick installation with minimal mess

Fiberglass is a solid choice for basic insulation needs and can be enhanced with air sealing and vapor barriers.

Our Recommendation at HomeWise Energy

We believe in recommending the right product for the right project. Often, the most effective insulation strategy involves a combination of materials — for example, using spray foam in the attic and fiberglass in the walls.

Our team at HomeWise Energy will evaluate your home’s layout, climate zone, energy usage, and budget to help you choose the perfect fit.

Need Help Deciding? Let Us Take a Look.

Every home is different, and there’s no one-size-fits-all solution when it comes to insulation. That’s why we offer:

✅ Free insulation consultations
✅ Honest recommendations — no upselling
✅ Certified installation of both spray foam and fiberglass
✅ Tailored solutions for maximum comfort and energy efficiency

📞 Contact HomeWise Energy today to book your free assessment and find out which insulation option is best for your home.