Spray Foam Insulation in St. Paul, MN

Spray foam insulation in St. Paul has a lot of old houses to deal with. Census survey estimates for 2019 to 2023 show that 41.6% of the city's homes were built in 1939 or earlier, and the median home dates to 1952. Many of those houses went up with empty walls, a few inches of attic insulation and no air sealing at all. We are an insulation company that seals and insulates them, using closed-cell or open-cell spray foam where it earns its cost and blown-in insulation where that does the job for less.

Why the cold matters here

The Minneapolis-St. Paul area has the coldest average annual temperature of any major metro in the continental U.S., 46.5 F according to the city's Wikipedia climate section. At the St. Paul Downtown Airport the 1991-2020 normal high in January is just 23.9 F, and the record low is -41 F. A house that leaks warm air at the attic floor and the rim joist pays for it every day from November through March, and the same leaks feed the ice dams and attic frost that show up on so many older roofs.

What Minnesota code and the DOE ask for

Ramsey, Washington and Dakota counties are in Climate Zone 6 under Minnesota's energy code. The efficientwindows.org summary of that 2012 IECC-based code lists R-49 for ceilings, R-20 plus R-5 continuous (or R-13 plus R-10) for wood-frame walls, R-30 for floors and R-15/19 for basement walls in Zone 6. DOE's Energy Saver guidance for existing homes in zones 6 and 7 suggests R-49 to R-60 in an attic. Code applies to new work and permitted remodels, so for a project in an existing house we start with those numbers and then fit them to the framing you actually have.

Closed cell vs open cell

Closed-cell foam is dense and rigid, carries more R-value per inch, and slows moisture as well as air. That makes it the usual choice for rim joists, basement walls, cathedral ceilings with shallow rafters and anywhere foam meets cold concrete. Open-cell foam is soft, lighter and less expensive per inch. It fills odd cavities well and quiets sound, but it lets vapor pass, so in a Minnesota roof or wall it needs a vapor control plan. Many jobs use both, plus loose fill in the open attic. Your quote names which one goes where.

Costs, in plain numbers

National cost guides put installed spray foam at roughly $1.50 to $5.00 per square foot (HomeGuide), with open cell at the low end and closed cell at the high end. HomeGuide lists a typical attic insulation job at $1,000 to $2,700 and spray foam on rim joists at $2,000 to $2,500. Many spray foam contractors also have a job minimum, which HomeGuide puts at $1,000 to $2,000 or more. Those are national ranges. Your price is the one on the written estimate we give you after the visit.

Rebates worth checking first

Xcel Energy's 2024-2026 Minnesota rebate summary lists 40% of project cost, up to $1,200, for attic insulation that goes from R-19 or less to R-49 or more, and the same 40% (up to $1,200) for filling empty wall cavities to R-11 or better. Air sealing is paid at 40% up to $600 when a blower door test shows at least a 15% drop in leakage, and the insulation rebates require that air sealing. Eligibility depends on who supplies your heat, so check the current rules before you sign anything. We can plan the work and the testing around them.

Choosing among spray foam insulation companies

When you compare insulation contractors near you, ask each one for the same things: the material for each area, the thickness or depth, the target R-value, what gets air sealed, how the foam will be covered where code calls for a thermal barrier, and how long you need to stay out of the house after spraying. A quote that lists all of that is easy to compare. A single number for "insulate house" is not. Get a free estimate

We work in St. Paul and across the east metro. In Ramsey County that means Maplewood, Roseville, North St. Paul, White Bear Lake, Shoreview, Vadnais Heights, New Brighton, Little Canada, Arden Hills and Falcon Heights. In Washington County we cover Woodbury, Oakdale, Lake Elmo, Mahtomedi, Cottage Grove and Stillwater. South of the river we work in West St. Paul, South St. Paul, Inver Grove Heights, Mendota Heights and Eagan. The housing changes a lot from one to the next: St. Paul and the river towns have the oldest homes, the inner-ring suburbs are full of 1950s to 1970s ramblers and split-levels, and places like Woodbury, Lake Elmo and Cottage Grove are mostly newer construction. Each town page covers what we see there and the local numbers behind it.