The leak at the bottom of the house
Basement & Rim Joist Insulation in Olathe, KS
Seal the rim and insulate the walls before the drywall goes up.
- Free on-site estimates
- Written quote with foam type, depth and R-value for each area
- Attic bypasses, rim joists and moisture checked first
Basement & Rim Joist Insulation Before You Finish
Basement and rim joist insulation fixes the leak that runs around the whole house at foundation level. The rim joist sits on top of the foundation wall, and in many homes it is covered with a loose batt or nothing at all. Cold air comes in at the sill all winter, floors feel cold, and in summer humid air finds the same path.
Rim joists
Closed-cell foam sprayed into each rim bay seals the gaps and insulates in one step. HomeGuide lists rim joist spray foam at $2,000 to $2,500 for a typical house. Evergy's Kansas chart lists a $50 rebate for at least 50 linear feet of rim or band joist.
Basement walls
The 2018 IECC table lists R-10 continuous or R-13 cavity insulation for basement walls in zone 4. If you are finishing the basement, closed-cell foam on the concrete before framing keeps damp indoor air off the cold wall, where it would condense behind the drywall.
Crawl spaces
Additions and some older homes have crawl spaces. Closed-cell foam on the walls and rim, plus a ground vapor barrier, warms the floor above.
Water first
We check for leaks, cracks and grading problems before quoting. Insulation does not stop water.
What This Covers
This service covers.
Rim joists
Closed-cell foam in every rim bay.
Basement walls
Closed-cell foam on concrete, usually before framing.
Crawl spaces
Foam on walls and rim with a ground vapor barrier.
Floors over garages
Insulation under floors above unheated space.
Published Basement & Rim Joist Insulation Costs
| Job | Range and source |
|---|---|
| Rim joists, spray foam | $2,000 to $2,500 (HomeGuide) |
| Closed-cell, installed | $3.00 to $5.00 per sq ft (HomeGuide) |
| Crawl space, spray foam | $2,000 to $4,000 (HomeGuide); $1,000 to $5,900 (Fixr) |
| Crawl space encapsulation | $3 to $10 per sq ft, $3,000 to $15,000 (HomeGuide) |
| Crawl space vapor barrier | $1,200 to $4,000 (HomeGuide) |
| Closed-cell on crawl space walls | $2 to $5 per sq ft (HomeGuide) |
HomeGuide's 2026 spray foam and crawl space guides and Fixr (2025) provide these ranges. Rim length, wall height, access and prep drive the cost. The written estimate after our visit is what you pay.
Basement Job Steps
1. Inspect
Check rim, walls, moisture and access.
2. Quote
Rim, walls and crawl space priced separately.
3. Prep
Clear the perimeter, cover floors and mechanicals.
4. Spray
Closed-cell foam to the quoted thickness.
Basement & Rim Joist Insulation Questions
Should I insulate basement walls before finishing?
Yes, it is the easiest and best time.
Do exposed foam walls need covering?
Depending on use, foam may need a thermal or ignition barrier. We explain what applies.
How much space do you need?
A few feet clear along the walls.
Is rim joist foam worth it alone?
Yes. It is one of the most cost-effective upgrades in most homes.
Basement & Rim Joist Insulation Service Areas
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Get a Basement & Rim Joist Insulation Estimate
Ask for a basement quote.