Air seal and insulate in one pass
Spray Foam Insulation in Saginaw, MI
The right foam for each surface, with thickness and R-value on paper.
- 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

Spray Foam Insulation for Michigan Houses
Spray foam insulation is sprayed as a liquid, expands into every crack and cures into a solid layer that both insulates and stops air. In a Saginaw-area house that matters most where cold air gets in and warm air gets out: rim joists, kneewalls, attic bypasses and walls that run open from floor to floor. Batts and loose fill slow heat but let air pass through; foam does both jobs.
Closed-cell foam
Dense and rigid, around R-5 to R-7 per inch (HomeGuide). At normal thickness it slows water vapor and does not soak up water, so it belongs on rim joists, basement and crawl space walls, pole barns and roof decks with no space to vent. It costs more per inch but packs more R-value into tight spots.
Open-cell foam
Soft and light, about R-3.5 to R-3.7 per inch. It expands a lot, fills irregular framing and dampens sound. In our climate it is used in above-grade walls and some roof assemblies with a planned vapor retarder, not against cold concrete.
Signs you need it
Ice dams or long icicles at the eaves, frost on attic nails in January, cold floors over the basement, drafts at baseboards, upstairs bedrooms that will not stay warm, or heating bills that climb every winter. A visit shows which problems come from air leaks and which from missing insulation.
Kneewalls and story-and-a-halfs
Many older homes in Saginaw and Bay City have upstairs rooms tucked under the roof, with short kneewalls and small attic spaces behind them. Those spaces leak a lot of heat. Foam on the kneewalls and the floor behind them, or on the underside of the roof, is often the fix.
We look at the attic, rim joists and walls, then quote each area separately. Get a free estimate
What This Covers
Where we spray.
Rim joists
Closed-cell foam in each bay of the rim where the house sits on its foundation.
Kneewalls and slopes
Foam in the kneewalls, floors and sloped ceilings of story-and-a-half homes.
Open walls
Foam in stud bays during remodels and additions.
Roof decks
Closed-cell foam under roof decks in cathedral ceilings and spaces with no room to vent.

Published Spray Foam Insulation Costs
| Job | Range and source |
|---|---|
| Spray foam, installed | $1.50 to $5.00 per sq ft (HomeGuide) |
| Open-cell / closed-cell | $1.50 to $3.50 / $3.00 to $5.00 per sq ft (HomeGuide) |
| About 1,000 sq ft | $1,500 to $5,000 (HomeGuide); $3,150 to $7,500 in an existing home (Fixr) |
| Existing walls / new construction | $3.15 to $7.50 / $2.75 to $6.50 per sq ft (Fixr) |
| All exterior walls | $4,000 to $10,000 (HomeGuide) |
| Whole house | $8,000 to $20,000 (HomeGuide); $10,000 to $30,000 (Fixr) |
| Typical minimum | $1,000 to $2,000+ (HomeGuide) |
HomeGuide (2026) and Fixr (2025) publish these national ranges. Foam type, thickness, access and prep move the price, and small jobs often hit a minimum. We measure first, and what you pay is the figure on the written estimate.
How a Foam Job Runs
1. Inspect
Attic, rim, walls and basement checked for leaks, moisture and old insulation.
2. Quote
Each area listed with foam type, thickness, R-value and price.
3. Prep
Cover floors and belongings, mask fixtures, set up ventilation; warm cold spaces if needed.
4. Spray
Apply in passes to the quoted thickness and check depth.
5. Clear
Ventilate, clean up and review the work with you.

Spray Foam Insulation Questions
Is closed-cell foam a vapor barrier?
At about 2 inches or more, closed-cell foam acts as a vapor retarder. That is why it is used on rim joists and below-grade walls here.
Can open-cell foam go on basement walls?
We do not recommend it against cold concrete in this climate. Closed-cell is the safer choice there.
How long do I stay out?
HomeGuide advises at least 24 hours. We give you the time for the product used.
Will spray foam fix my ice dams?
It helps when it seals the bypasses that heat the roof. Ventilation and attic depth matter too, and we look at all three.
Spray Foam Insulation Service Areas
- Spray Foam Insulation in Saginaw, MI
- Spray Foam Insulation in Saginaw Township, MI
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Get a Spray Foam Insulation Estimate
Get a written spray foam quote for your home.