Frequently Asked Questions

HomeGuide lists $1.50 to $5.00 per square foot installed, with open cell at $1.50 to $3.50 and closed cell at $3.00 to $5.00. A rim joist job often runs $2,000 to $2,500. We measure and give you a written price.

At HomeGuide's $1.50 to $5.00 per square foot, 1,500 square feet of foam would range from about $2,250 to $7,500, depending on foam type and thickness. Real jobs vary with access and prep.

A 20x20 garage has 400 square feet of ceiling plus wall area that depends on height, often another 600 to 800 square feet. Closed cell at $3.00 to $5.00 per square foot (HomeGuide) puts many garages in the low-to-mid thousands. We measure for a firm number.

Bad installs give it that reputation: foam sprayed too thick at once, off-ratio mixes that smell, or foam on a roof deck that hides leaks. Careful product choice, proper passes, ventilation and a written record of what was installed avoid most of it.

Once the water source is handled, yes. Closed-cell foam resists moisture, but insulation should never cover active seepage. We point out water problems first.

Focus on Energy, Wisconsin's statewide program, has published insulation and air sealing rebates paid through its registered Trade Ally contractors. Terms change each period, so check focusonenergy.com for current offers.

Properly mixed and applied foam is inert once cured. HomeGuide advises staying out of sprayed areas for at least 24 hours. We ventilate during and after spraying.

Closed cell, after any active water is fixed. It resists moisture and keeps humid air off cold concrete.

It can, but it makes the deck hard to inspect, which bothers some buyers and inspectors. We recommend it only where the attic holds ducts or equipment or the roof shape leaves no option.

In cold climates it usually needs a moisture plan where it is used. Closed-cell foam at normal thickness acts as its own vapor retarder.

Sealing and insulating removes the main cause, heat reaching the roof deck. Roof design and gutters also play a part, and we look at those.

HomeGuide puts a typical attic job at $1,000 to $2,700, about $1,800 on average, with air sealing at $350 to $3,000.

Heat cables treat the symptom at the eaves. Sealing and insulating the attic deals with the cause.

Only if it is wet, moldy, soiled or blocking the sealing work.

Fix the water first: grading, gutters, drainage or crack repair. Then closed-cell foam is a good choice.

HomeGuide lists about $2,000 to $2,500 for a typical home. Your written estimate is the price.

If it is damp or musty, sealing the vents, laying a vapor barrier and insulating the walls usually helps. HomeGuide lists crawl space vapor barriers at $1,200 to $4,000.

In living areas, exposed foam generally needs a fire-rated covering such as drywall. We explain what applies.

Blown-in is cheaper per square foot. HomeGuide lists it at $1.00 to $2.80 per square foot versus $1.50 to $5.00 for foam. Foam earns its cost where air sealing and moisture matter most.

Installed at proper density, cellulose resists settling.

Enough to reach R-49, the ceiling value in Wisconsin's Zone 6 code summary. For cellulose that is roughly 13 to 16 inches.

Yes, if they are dry and clean, after sealing.

With 400 square feet of ceiling and roughly 600 to 800 square feet of walls depending on height, closed cell at $3.00 to $5.00 per square foot (HomeGuide) adds up quickly. We measure and give a written price.

Yes. Closed-cell foam on the steel keeps warm air off the cold metal.

Surfaces must be warm enough for the foam to bond. In winter we may heat the space first.

We seal around the frame. An insulated door usually works better than foam on the panels.

If batts or loose fill got wet, usually yes. They hold water against the framing. We remove them, let the wood dry, then reinsulate.

HomeAdvisor lists $1 to $2 per square foot, with typical jobs around $600 to $1,200, and removal plus replacement averaging about $1,852.

Usually because it was sprayed where it should not be, such as over a roof deck that needs inspection, or because of a bad mix.

It is dusty, hot work, and vermiculite must never be disturbed without testing. We can quote it so you can compare.