If you’re building a new home, finishing a basement, or just trying to figure out why your energy bills keep climbing, chances are you’ve run into a decision every homeowner eventually faces: spray foam insulation or blown-in insulation?<\/p>\n
Both do the same basic job, keeping conditioned air inside and the outdoors outside, but spray foam insulation and blown-in insulation get there in very different ways. The right choice depends on your home, your budget, and what you’re trying to solve. Here’s a straightforward breakdown of spray foam insulation and blown-in insulation to help you figure out which one fits your project.<\/p>\n
Spray foam insulation starts as a liquid. It’s sprayed into wall cavities, attics, rim joists, or crawl spaces, where it expands on contact and hardens into a solid layer that seals gaps, cracks, and seams as it goes.<\/p>\n
There are two main types of spray foam insulation:<\/p>\n
Because it expands to fill irregular spaces, spray foam insulation is particularly effective at sealing the small gaps around wiring, plumbing, and framing that other insulation types tend to miss.<\/p>\n
Blown-in insulation, sometimes called loose-fill insulation, is made of fiberglass or cellulose material that’s mechanically blown into attics, walls, and other open cavities using specialized equipment. Instead of expanding and sealing like spray foam insulation, blown-in insulation settles into place, filling the space with a dense layer of insulating fiber.<\/p>\n
Blown-in insulation is a popular choice for:<\/p>\n
Because it doesn’t require opening up walls the way spray foam insulation sometimes does, blown-in insulation is often the more practical option for upgrading an existing home’s energy efficiency without a full renovation.<\/p>\n
Cost:<\/strong> Blown-in insulation is generally the more budget-friendly option upfront, both in materials and labor. Spray foam insulation costs more per square foot, but that difference is often offset over time through energy savings and air sealing.<\/p>\n R-value:<\/strong> Closed-cell spray foam insulation offers the highest R-value per inch of any common insulation material, meaning you can achieve strong thermal performance without needing as much depth. Blown-in insulation requires more material to hit the same R-value, which matters most in tight spaces like attic corners or shallow rafters.<\/p>\n Air sealing:<\/strong> This is where spray foam insulation has a clear edge. Because it expands into gaps and cracks, spray foam insulation does double duty as both insulation and an air barrier. Blown-in insulation slows heat transfer but doesn’t seal air leaks the same way, so it’s often paired with separate air-sealing work for best results.<\/p>\n Moisture resistance:<\/strong> Closed-cell spray foam insulation holds up better in damp environments like basements and crawl spaces. Cellulose and fiberglass blown-in insulation can lose effectiveness if it gets wet, so it’s better suited to dry, well-ventilated spaces like attics.<\/p>\n Installation time:<\/strong> Blown-in insulation installs quickly, often within a matter of hours for an average attic. Spray foam insulation takes longer to apply and cure, and typically requires the space to be unoccupied during installation.<\/p>\n There’s no single right answer, as it all depends on the project:<\/p>\n A quick home assessment can help pinpoint exactly where you’re losing the most energy, which makes the choice between spray foam insulation and blown-in insulation a lot easier.<\/p>\n Every home is different, and the best insulation strategy usually isn’t one-size-fits-all. As an employee-owned family of companies, Kinzler Corporation’s insulation brands \u2014 including Kinzler Construction Services<\/a>, Leading Edge Insulation Services<\/a>, and Banker Insulation<\/a> \u2014 install both spray foam insulation and blown-in insulation across the Midwest, Southwest, and beyond, so our recommendation is based on what’s actually best for your home, not a one-product playbook.<\/p>\nWhich One Should You Choose?<\/h2>\n
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Get an Expert Opinion Before You Decide<\/h2>\n