Spray Foam, Fiberglass, or Cellulose — Which One’s Right for Your Project?

Choosing the right insulation can make or break your comfort, energy efficiency, and construction budget. With so many materials on the market, it’s easy to get overwhelmed. At EcoMax Insulation, we break it down simply: the best insulation is the one that fits your project’s needs — not just a trend. Here’s a side-by-side look at spray foam, fiberglass, and cellulose to help you make the right call.

1. Spray Foam Insulation

Best for: Maximum performance, air sealing, moisture control

Spray foam expands to fill every gap, sealing air leaks and locking in energy efficiency. It's available in two types:

• Closed-cell: Highest R-value, acts as vapor barrier, adds structural strength

• Open-cell: More affordable, great for soundproofing interior walls

Pros:

• Extremely energy efficient

• Blocks air and moisture

• Lasts for decades

• Great for irregular spaces

Cons:

• Higher upfront cost

• Requires professional installation

2. Fiberglass Insulation (Batt or Blown-In)

Best for: Budget-friendly installs and wide wall/ceiling areas

Fiberglass is one of the most common insulation materials, especially for new construction or simple upgrades. It’s non-combustible, mold-resistant, and easy to install.

Pros:

• Cost-effective

• Quick to install

• Readily available

• Meets code easily

Cons:

• Can leave air gaps if poorly installed

• Lower R-value per inch than spray foam

• Less effective air sealing

3. Cellulose Insulation

Best for: Eco-conscious homes and dense wall fills

Made from recycled paper treated for fire, mold, and pest resistance, cellulose is ideal for retrofits and soundproofing. It’s often dense-packed into walls or blown into attics.

Pros:

• Environmentally friendly

• Excellent for dense fills and sound absorption

• Inexpensive material cost

• High R-value compared to fiberglass

Cons:

• Settling over time may reduce effectiveness

• Can retain moisture if not sealed properly

• Needs professional blowing equipment