Spray Foam vs Fiberglass Insulation

A side-by-side comparison to help you make the best insulation decision for your Wisconsin home or building.

How They Compare

Fiberglass has been the standard for decades, but spray foam outperforms it in nearly every category that matters.

Feature

Spray Foam

Fiberglass

R-Value Per Inch

R-6.5 to R-7

R-2.2 to R-3.8

Air Sealing

Continuous, seamless seal

Leaves gaps & drafts

Moisture Barrier

Built-in vapor barrier

Absorbs water, risks mold

Longevity

Lifetime performance

Sags & settles in 10–15 yrs

Installation

Expands to fill every gap

Cut & fitted, leaves gaps

Pest Resistance

Rodents can't nest in it

Rodents nest & burrow

Why Spray Foam Wins

The four differences that matter most for Wisconsin homes and buildings.

Nearly Double the R-Value

Closed-cell spray foam delivers R-6.5 to R-7 per inch versus R-2.2 to R-3.8 for fiberglass. You get better performance in the same thickness, without giving up interior space.

A Complete Air & Moisture Seal

Spray foam expands on contact to fill every crack and cavity, creating a continuous air barrier. It's also its own vapor barrier, so it won't absorb water or support mold — critical in Wisconsin's freeze-thaw climate.

Performance That Lasts

Fiberglass sags, settles, and loses R-value over 10–15 years. Spray foam doesn't degrade — once it's installed, it holds its performance for the life of the building.

Lower Cost of Ownership

Fiberglass is cheaper upfront, but spray foam's energy savings and permanent performance make it the better long-term value. As an owner-operator, we offer the most competitive spray foam prices in the Eau Claire area.

Get a Free Estimate Today

Serving Eau Claire, Chippewa, Dunn, Barron, Rusk, Sawyer, Clark, Taylor, Price counties in northwestern Wisconsin. Call or email for a free on-site inspection and quote.