At NetZero Insulation, we specialize in sealing up these problem areas with spray foam insulation for rim joists—a powerful solution that delivers real results.

So, What Are Rim Joists?

They’re the areas where your floor framing meets the exterior walls—usually found in basements or crawlspaces. These joints often have small gaps or cracks where air can sneak in and out. Without proper insulation, your HVAC system has to work overtime just to keep things comfortable.

That’s where spray foam comes in. Unlike fiberglass or other traditional insulation materials, spray foam expands to fill every gap, creating an airtight seal that blocks drafts and locks in heat.

Here’s How We Do It

We start by removing any old or damaged attic insulation that might be in the way. Our team works quickly and cleanly, so there’s minimal disruption to your home. Once we’ve cleared the space, we apply high-quality spray foam directly to the rim joists, sealing off those hidden areas where energy loss often happens.

The result? A quieter, more comfortable home—and lower energy bills to go with it

Why Homeowners Choose Us

With over 26 years of experience and a reputation for doing the job right, NetZero Insulation has become Colorado’s go-to insulation expert. We’re certified, experienced, and passionate about helping homeowners make smarter energy choices.

Plus, we can help you qualify for rebates and tax credits to make your insulation upgrade even more affordable.

If you’re ready to make your home more efficient, comfortable, and draft-free, let’s talk. Reach out today to schedule your free estimate and see what a difference spray foam rim joists can make.