You’re getting new insulation and now you’ve got options. Spray foam. Blown-in. Maybe you’ve heard both terms and have no idea which one is actually right for your house.
We get this question a lot. And the honest answer is: it depends. But we’ll walk you through exactly what each one does, where each one shines, and what makes sense for homes here in Hampton Roads. When it comes to spray foam vs blown-in insulation, there’s no universal right answer. There’s only the right answer for your specific home.
Our blown-in insulation in Virginia Beach is a great fit for a lot of homes. So is our spray foam insulation in Virginia Beach. Here’s how to tell which one belongs in yours.
First, What’s the Difference?
Blown-in insulation. Also called loose-fill. Small particles of insulation material, usually fiberglass or cellulose, that get blown into a space using a machine. It fills in around joists, framing, and tight corners really well.
Spray foam insulation. This comes in two versions. Open-cell, which is softer and more flexible, and closed-cell, which is denser and creates a moisture barrier. Spray foam expands when it’s applied, which means it fills gaps and seals air at the same time.
Both work. Both have their place. The question is which one is right for your specific situation.
Where Blown-In Insulation Makes the Most Sense
Attic floors. Blown-in is the go-to choice for attic floors in Hampton Roads. It’s cost-effective, installs quickly, and does a great job adding R-value to an existing attic without a lot of disruption.
Homes that need more insulation but not a full overhaul. If your attic already has some insulation but not enough, blown-in can be added on top.
Budget-conscious projects. Blown-in is generally less expensive than spray foam per square foot. If you need to insulate a large attic floor and you’re watching the budget, blown-in is usually the call.
We’ve done a lot of blown-in jobs in the Great Neck and Lynnhaven areas of Virginia Beach. Older ranch homes, split-levels. It works really well in those attic configurations.
Where Spray Foam Makes the Most Sense
Air sealing is a priority. Spray foam seals as it insulates. That’s its superpower. If your home has significant air leakage, or if you want the best possible thermal performance, spray foam does things blown-in just can’t.
Unvented attic assemblies. If you want to condition your attic space, meaning the HVAC equipment in the attic benefits from being inside the thermal envelope, spray foam on the roof deck is the right choice.
Crawl spaces. Spray foam is particularly well-suited for crawl spaces in Virginia Beach. The moisture sealing properties matter a lot in our climate.
Rim joists and tight spaces. Spray foam is great for sealing rim joists, around pipes, and in tight spots where blown-in would just fall out.
R-Value: What It Means and Why It Matters
R-value measures thermal resistance. Higher R-value means better insulation. The U.S. Department of Energy recommends R-38 to R-60 for attic floors in our climate zone, which covers Hampton Roads.
See the full insulation recommendations from the U.S. Department of Energy based on your climate zone.
Blown-in cellulose and fiberglass both achieve good R-value per inch but need to be installed at the right depth to hit your target. Closed-cell spray foam has a higher R-value per inch than blown-in, which matters when you have limited space. Open-cell spray foam has a lower R-value per inch but expands more and covers larger areas efficiently.
The Cost Difference: Real Talk
Spray foam costs more. That’s just the reality.
- Blown-in insulation: typically $1.50 to $2.50 per square foot for attic floors
- Open-cell spray foam: usually $1.50 to $3.00 per square foot
- Closed-cell spray foam: runs $3.00 to $5.00 per square foot or more
For most whole-attic projects, the cost difference is real. But spray foam’s air sealing benefits can justify the price depending on your home’s specific situation.
Which One Should You Choose?
Blown-in if: You need more insulation in your attic floor, budget matters, and you don’t have major air leakage issues.
Spray foam if: Air sealing is a priority, you’re doing crawl spaces or rim joists, you want to condition your attic, or you have tight spaces where blown-in won’t work.
Combination approach if: You want the best of both. A lot of our Hampton Roads customers do spray foam to seal the critical areas and blown-in for the attic floor volume. It’s often the smartest move.
We’re happy to walk through your specific home and tell you what actually makes sense. Not what costs the most. What works best.
Frequently Asked Questions
Can I use blown-in insulation in my crawl space?
Not ideal. Blown-in doesn’t handle moisture well. Spray foam or rigid board is better for crawl spaces in Hampton Roads.
How long does blown-in insulation last?
Done right, 20 to 30 years or more. Conditions in your attic and any pest activity will affect how it holds up over time.
Does spray foam off-gas or smell?
During installation, yes. After it cures, usually 24 to 48 hours, it’s inert and odorless.
Is blown-in insulation the same as batt insulation?
No. Batts are pre-cut rolls or panels. Blown-in is loose-fill material blown in with a machine. Different materials, different installation methods.
Which is better for a split-level home in Hampton Roads?
Usually a combination. Attic floor gets blown-in. Any conditioned spaces or crawl areas get spray foam. We’d want to see your specific setup before making a firm call.
Not sure which one your home needs? We offer free next-day quotes and we’ll tell you exactly what we recommend and why.