Start at the bottom of the house
Basement & Rim Joist Insulation in Saginaw, MI
Seal the rim, insulate the walls, and keep the floors warmer.
- Free on-site estimates
- Written quote listing foam type, depth and R-value by area
- Rim joists, attic bypasses and moisture checked before we cover anything
Why Basement & Rim Joist Insulation Matters Here
Basement and rim joist insulation fixes the leak most Saginaw-area homeowners never see. The rim joist is the band of framing that sits on top of the foundation wall all the way around the house. In older homes it is often bare wood with gaps where the sill meets the concrete, and cold air pours through them all winter. The floors above feel cold, the basement stays chilly and the furnace runs longer.
Closed-cell foam on the rim
Sprayed into each bay, closed-cell foam seals the gaps and insulates the wood in one step, and it does not trap moisture against the framing the way loose batts can. HomeGuide lists rim joist spray foam at $2,000 to $2,500 for a typical house.
Basement walls
If you are finishing a basement, insulate the concrete walls before framing. Foam on poured or block walls keeps warm, damp indoor air off cold concrete, where it would condense. The 2021 IECC values summarized for zone 5 call for basement walls at R-15 continuous or R-19 in the cavity; we size to your plan and your building department's requirements.
Crawl spaces
Crawl spaces under additions and older homes are often vented and cold. Closed-cell foam on the walls and rim, with a ground vapor barrier, turns the crawl into a semi-conditioned space and warms the floor above.
Moisture first
We look for wet walls, efflorescence, cracks and grading problems before quoting. Insulation does not fix water coming in; that has to be handled first.
What This Covers
What this service covers.
Rim joists
Closed-cell foam in every bay around the basement or crawl space.
Basement walls
Closed-cell foam on concrete or block walls, usually before framing.
Crawl space walls
Foam on walls and rim with a ground vapor barrier.
Floors over unheated space
Foam or batts under floors above garages or vented crawls.
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) |
Sources: HomeGuide's 2026 spray foam and crawl space guides and Fixr (2025). Linear feet of rim, wall height, access and prep set the total. After we measure, the written estimate is the price.
How We Do a Basement
1. Inspect
Check the rim, walls, moisture, cracks and access.
2. Quote
Rim, walls and crawl space priced as separate lines.
3. Prep
Clear the perimeter, cover the floor and mechanicals.
4. Spray
Closed-cell foam to the quoted thickness.
Basement & Rim Joist Insulation Questions
Is rim joist insulation worth it?
In most homes here, yes. It is one of the cheapest ways to cut drafts and warm the first floor.
Should I insulate basement walls if I am not finishing them?
It still helps, but closed-cell foam on exposed walls may need an ignition or thermal barrier depending on use. We explain the options.
Do I need to empty the basement?
Only the perimeter. We need a few feet of clear space along the walls.
Does Consumers Energy offer a rim joist rebate?
Its rebate chart lists $50 for insulating all accessible rim joist areas, with lower amounts for electric-only customers. Check the current chart.
Basement & Rim Joist Insulation Service Areas
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Get a Basement & Rim Joist Insulation Estimate
Ask for a basement and rim joist quote.