Closed-Cell vs Open-Cell Spray Foam: Which One Do You Need?

Thinking about spray foam insulation but feeling stuck between closed-cell and open-cell options? You’re not alone—it’s one of the most common questions we get from homeowners looking to boost comfort and energy efficiency.

Here’s the thing: not all spray foam is created equal. The type you choose can make a big difference, especially here in Nova Scotia, where the winters are cold, the weather is damp, and energy bills can sneak up fast.

So let’s break it down—what’s the difference between closed-cell and open-cell spray foam?

And more importantly, which one do you actually need? (Spoiler: we’re big fans of closed-cell for a reason.)

The Two Types of Spray Foam – What’s the Difference?

Both closed-cell and open-cell spray foams are made from similar chemical components and applied in the same way—they expand on-site to fill cracks, gaps, and hard-to-reach spaces.

But once they've been cured, they behave very differently. Here’s a quick side-by-side:

Feature	Open-Cell Spray Foam	Closed-Cell Spray Foam
Texture	Soft and spongy	Dense and rigid
R-Value (per inch)	Lower (~R-3.5)	Higher (~R-6 to R-7)
Air Seal	Good	Excellent
Moisture Barrier	No	Yes (acts as vapor barrier)
Application Areas	Interior walls, soundproofing	Attics, basements, exteriors, steel buildings
Cost	Lower upfront cost	Higher value + durability

Both can work in the right setting—but here in Nova Scotia? Closed-cell wins every time.

Why We Recommend Closed-Cell Spray Foam

At Spray Foam Squad, we specialize in closed-cell spray foam—and here’s why:

1. It’s built for our climate. Nova Scotia winters are no joke. Closed-cell spray foam offers a much higher R-value, which means it keeps your home warmer, longer.

2. It resists moisture. Our coastal climate = lots of humidity. Closed-cell acts as a moisture barrier, making it perfect for damp basements, crawlspaces, garages, and exterior walls.

3. It adds structural strength. Closed-cell foam is rigid and durable, which can actually reinforce walls and building envelopes. It doesn’t sag or shift over time.

4. It seals like nothing else. Closed-cell fills and seals every gap, creating an airtight envelope that keeps drafts out and energy in.

   
   

In short, it’s the most powerful and reliable option for homes in Nova Scotia—and that’s why it’s the only kind we offer.

When Would Someone Use Open-Cell?

Great question! Open-cell spray foam has its place—it’s softer, more flexible, and better for sound dampening. You’ll often find it in interior walls of buildings where moisture isn't an issue, and where you want some breathability.

But for colder, wetter climates like ours? It just doesn’t offer the same level of insulation, durability, or moisture protection as closed-cell foam.

So if you're comparing the two, and you're trying to insulate an attic, basement, garage, or entire home in Nova Scotia... closed-cell is hands-down the better investment.

Closed-Cell = Long-Term Comfort + Savings

Closed-cell spray foam might cost a bit more upfront than open-cell or traditional insulation—but it more than makes up for it in performance and savings.

Here’s what you get:

• Lower energy bills (thanks to high R-value and air sealing)

• Consistent indoor temperatures—no more freezing rooms or hot spots

• Lasting protection from drafts, moisture, and mold

• No sagging or settling over time

  
  

Plus, you may even qualify for rebates through Efficiency Nova Scotia when upgrading your insulation. Win-win!

At Spray Foam Squad, we’re happy to walk you through your options—honestly, clearly, and without the jargon.

If you’re building, renovating, or just tired of cold floors and high heating bills, closed-cell spray foam could be the upgrade your home’s been waiting for.

Let’s make your home warmer, drier, and more energy-efficient—starting today!

📱 Call or text: 902-918-0405

📧 Email: sales@sprayfoamsquad.ca

🌐 www.sprayfoamsquad.ca