Air sealing and insulation together
Spray Foam Insulation in Bay City, MI
A sprayed layer that blocks air and adds R-value, used where it beats the alternatives.
- Free estimates after an on-site look
- Each area itemized with material, depth and R-value
- Roof leaks, wet sills and old wiring noted before we cover anything
Stopping Air as Well as Heat
Spray Foam Insulation is a two-part liquid that expands as it is sprayed and cures into a solid layer bonded to the surface behind it. It fills gaps, seams and cracks, so it stops air as well as slowing heat. In an older Bay City house, air is often the bigger loss: cold air pulled in at the sill and rim joist, and warm air rising out through the attic floor and the open tops of balloon-framed walls.
Closed-cell foam
Closed-cell foam is dense and hard once cured, about R-5 to R-7 per inch in HomeGuide's figures. At normal thickness it slows water vapor and does not absorb water. We use it on rim joists and sills, foundation and crawl space walls, the underside of floors over open crawl spaces, roof decks with no attic and steel buildings. It also adds some stiffness.
Open-cell foam
Open-cell foam is soft and light at about R-3.5 to R-3.8 per inch. It expands to fill irregular open cavities and absorbs sound, so it works in open walls during remodels, between floors and under some roof decks. Because vapor passes through it, it needs a vapor retarder or a design that can dry in this climate, and it should not touch cold concrete or steel.
Older houses
In finished walls of older homes, foam is not usually the right tool, because it has to be sprayed into open cavities. Dense-pack cellulose is blown into closed walls through small holes instead. Foam does its best work in older houses at the rim and sill, especially on fieldstone or uneven foundations, in crawl spaces, and in walls that are opened during a renovation.
When foam is wrong
An open attic floor is almost always cheaper to seal and blow in to depth. And foam never fixes water: roof, plumbing and foundation leaks come first, or the foam hides the problem.
On the day
We cover floors and contents, ventilate, and spray in passes to the depth on the estimate. HomeGuide advises staying out of the house for at least 24 hours while foam cures and airs out. In living or storage spaces foam usually needs a thermal or ignition barrier depending on the product and use; we say if yours does.
Call (989) 930-1257 or book a visit and we will show you where foam makes sense in your house. Get a free estimate
What This Covers
Where foam goes.
Rim joists and sills
Closed cell at the top of the foundation, including fieldstone.
Crawl spaces
Closed cell on walls, or under floors that stay vented.
Renovation walls
Open or closed cell in walls opened during a remodel.
Rooflines and dormers
Foam where there is no room for blown-in.
Bonus rooms
Floors over garages and kneewalls beside attics.
Pole barns and shops
Closed cell on steel.
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 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 job minimum | $1,000 to $2,000+ (HomeGuide) |
National figures from HomeGuide (2026) and Fixr (2025), given as a reference only. Foam type, depth, access, prep and minimums move the total. We measure first, and the written estimate is what you pay.
How It Works
1. Inspection
Each space measured and checked for leaks, damp wood and wiring.
2. Itemized plan
Foam type, depth, R-value and price per area.
3. Spray
Masking, ventilation, foam in passes to depth.
4. Finish
Barrier where required, cleanup and a walk-through.
Why Choose Us for Spray Foam Insulation
Right tool per surface
Foam, dense-pack or blown-in, whichever fits.
Depth written
Thickness and R-value on every line.
Dry first
No foam over leaks or wet wood.
Spray Foam Insulation Questions
Is there a downside to spray foam insulation?
It costs more than other insulation, the house must be empty while it cures, and it is hard to remove later. On a roof deck it can hide a slow leak. We use it where those trade-offs are worth it.
Can spray foam go into finished walls?
Not normally. Closed walls are filled with dense-pack cellulose through small holes.
How long does foam take to cure?
HomeGuide advises staying out at least 24 hours while it cures and airs out.
Does spray foam work on fieldstone foundations?
Yes. It follows the uneven stone at the sill and seals the gaps.
Spray Foam Insulation Service Areas
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Get a Spray Foam Insulation Estimate
Free spray foam estimates in Bay City.