Air seal and insulate in one pass

Spray Foam Insulation in Green Bay, WI

The right foam for each surface, sprayed at the right thickness and written into your quote.

Free on-site estimates
Written quote showing foam type, depth and R-value
Moisture, roof leaks and old insulation checked first

Why Foam Works on Brown County Houses

Spray foam insulation is a liquid that expands into a solid as it is sprayed, filling cracks and gaps that batts and loose fill leave open. Because it bonds to wood, concrete and steel, it seals air leaks and insulates in one step. Homeowners usually call us about it for one of four problems: cold floors over a basement, ice dams, a room over the garage that never warms up, or a garage or shop that sweats and freezes.

Open cell and closed cell

Closed-cell foam is the dense one. HomeGuide rates it at R-5 to R-7 per inch, and at normal thickness it slows vapor and sheds water instead of soaking it up. It is the right call against concrete, on rim joists, in crawl spaces and on the steel of pole buildings. Open-cell foam is lighter, expands much more and rates R-3.5 to R-3.7 per inch. It costs less per square foot, fills odd cavities well and dampens sound, and we use it in interior framing and roof lines where moisture is planned for.

Where it pays off in a cold climate

Green Bay sees long stretches below freezing, and the 2009-based Wisconsin code lists R-20 walls and R-49 ceilings for Zone 6. In an old house you will not reach those numbers everywhere, but foam gets you the most per inch in tight spaces: the rim joist, a cathedral ceiling with 2x6 rafters, a kneewall behind a bonus room or the band where an addition meets the original house.

Things to settle before spraying

We check for wiring that needs attention, wet wood, active leaks and whether a vent fan or flue needs clearance. Foam must stay away from heat sources, and some areas need a fire-rated covering afterward. We explain which ones on your quote.

Where We Spray

The common spots, and which foam usually goes there.

Rim joists and sill plates

Closed cell seals the band where the floor framing meets the foundation, one of the leakiest spots in a basement.

Basement and crawl space walls

Closed cell on concrete or block adds R-value and keeps humid indoor air off the cold wall.

Cathedral ceilings and roof lines

Open or closed cell between rafters where there is no room for loose fill, with a vapor plan.

Kneewalls and bonus rooms

Foam on the kneewalls and the floor over the garage stops the drafts that make these rooms cold.

New walls and additions

Open stud bays get foam before drywall for a tight, solid wall.

Garages, shops and pole buildings

Closed cell on steel or wood framing to stop condensation and hold heat.

Rim Joist & Basement Insulation in Green Bay, WI

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)

Figures are national ranges from HomeGuide's 2026 guide and Fixr's 2025 guide. Thickness, foam type, access and prep work move the total, and small jobs often land on a minimum. We measure first, and the amount on your written estimate is what you are charged.

How a Foam Job Goes

1. Look and measure

We inspect the areas, measure them and check for moisture, wiring and ventilation issues.

2. Written quote

Each area is listed with foam type, thickness and R-value, plus any prep or removal.

3. Prep and protect

We cover floors and belongings, mask what should not get foam and set up ventilation.

4. Spray in passes

Foam goes on in passes at the thickness each product allows, so it cures properly.

5. Cure and clean up

We trim, clean up and tell you when the space is ready to use again.

Garage & Pole Building Insulation in Green Bay, WI

Why Choose Us for Spray Foam Insulation

Matched to the surface

Closed cell where moisture or concrete is involved, open cell where it saves money without risk.

R-values in writing

You see the thickness and R-value for each area on the quote.

Clear re-entry plan

We tell you how long to stay out and keep the space ventilated during cure.

Spray Foam Insulation Questions

What's the difference between spray foam and regular insulation?

Batts and loose fill slow heat moving through them, but air can still pass through and around them. Spray foam fills the gaps and seals air movement as well as insulating. That is why foam on a rim joist can change how a basement feels more than its R-value alone suggests.

How long do we need to stay out after spraying?

HomeGuide advises allowing at least 24 hours before going back into the sprayed area. For a basement rim joist you can often stay in the rest of the house if the area is closed off and ventilated. We go over the plan for your house before we start.

Can spray foam go on the underside of my roof?

It can, and it turns the attic into a conditioned space. It also makes the roof deck hard to inspect, so we only recommend it where the attic holds ductwork or equipment or the roof shape leaves no other option.

Will foam stop a water leak?

No. Foam is not a repair for a roof, foundation or plumbing leak, and covering one hides the damage. Leaks get fixed first, then we insulate.

Spray Foam Insulation Service Areas

Get a Spray Foam Insulation Estimate

Tell us where the house feels cold or drafty and we will suggest where foam makes sense.

Call (920) 367-1117 Free Estimate