Rim Joist Insulation
Specialized Service
Rim Joist Insulation
Rim joists are one of the most overlooked — and highest-impact — areas for insulation improvement. Sealing and insulating your rim joists can dramatically reduce drafts, cold floors, and energy waste.
What Is a Rim Joist?
The rim joist (also called a band board) is the board that sits on top of your foundation wall, connecting the floor system to the exterior of your home. It runs around the entire perimeter of your house and is a major source of air infiltration and heat loss — especially in older homes where it's often completely uninsulated.
Why Rim Joist Insulation Is So Important
Even in homes with good wall and attic insulation, uninsulated rim joists create a continuous thermal break around the entire perimeter. Cold air enters through gaps around the rim joist, causing cold floors, drafts at baseboards, and wasted energy.
- ✓Rim joists can account for up to 10-30% of a home's total heat loss
- ✓Air sealing the rim joist area is one of the best energy upgrades available
- ✓Prevents frozen pipes that run near exterior walls
- ✓Eliminates cold floors above basements and crawl spaces
- ✓Reduces pest and moisture entry points
Our Rim Joist Insulation Process
We use closed-cell spray foam to insulate and air-seal rim joists in a single application. The foam bonds directly to the wood and concrete, creating an airtight thermal barrier.
- ✓Two-inch minimum closed-cell spray foam application
- ✓Complete air sealing of all gaps, cracks, and penetrations
- ✓Can be done as a standalone project or as part of a larger weatherization plan
- ✓Typical installation takes just a few hours
- ✓Immediate comfort improvement — noticeable the same day
Ready to Get Started?
Contact us today for a free, no-obligation energy assessment.
Ready to get started?
Expert Weatherization & Insulation in Michigan’s Upper Peninsula
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