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Spray Foam Insulation in Stillwater, MN

Lumber town on the St. Croix

Spray Foam Insulation in Stillwater, MN

A quarter of Stillwater's homes predate 1940. We insulate them without wrecking what makes them worth keeping.

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  • Free on-site estimates
  • Written quote with material, depth and R-value for each area
  • Air sealing done before any insulation covers it

Insulating Houses From the Lumber Era

Spray foam insulation in Stillwater often means working on historic houses. Stillwater was founded in 1843 by the Stillwater Lumber Company and incorporated in 1854, the same day as St. Paul, and it grew on sawmills along the St. Croix. Point2Homes' summary of 2019-2023 census data shows 24.8% of the city's homes were built before 1940, while 16.1% were added in 2000-2009, giving a median year of 1980.

Older homes on the hills

Houses from the 1800s and early 1900s may be balloon framed, which leaves open channels from the basement to the attic inside the walls. Those channels move a lot of air. Sealing them at the top and bottom, then filling walls with dense-pack, makes a large difference. Attics are often small and complex, with kneewalls and dormers.

Care with historic fabric

We drill from the inside or under lifted siding depending on what you want to protect, and patch carefully. If your house is in a historic district, check with the city about any exterior work before we start.

Newer Stillwater

Stillwater's newer homes, a sixth of them built in the 2000s, need the usual tune-ups: rim joists, bonus rooms and attic sealing.

Attics in old houses

Older Stillwater homes often have small, cut-up attics with kneewalls and dormers. We seal the top of the balloon-framed wall cavities and then insulate the kneewalls, slopes and flat sections separately.

Costs

HomeGuide lists blown-in exterior walls at $1,900 to $7,800 and dense-pack cellulose at $1.60 to $4.20 per square foot nationally. Historic homes may land at the higher end because of trim, multiple stories and careful patching.

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What to Know in Stillwater

  • Lumber-era roots. Founded October 26, 1843, by the Stillwater Lumber Company; incorporated March 4, 1854 (Wikipedia).
  • Housing age. 24.8% of homes built before 1940 and 16.1% in 2000-2009; median construction year 1980 (ACS 2019-2023 via Point2Homes).
  • Housing count. 8,210 housing units in the 2020 census, 5.6% vacant (Wikipedia).
  • Frost depth. Washington County is in frost Zone II, 3.5-foot minimum footings (Minn. R. 1303.1600).
Blown-In Insulation in St. Paul, MN

Our Services in Stillwater, MN

Stillwater Questions

What is balloon framing and why does it matter?

Balloon-framed walls run continuously from the foundation to the roof, leaving open air channels. Sealing them top and bottom is one of the most effective fixes in an old house.

Can you insulate a historic house without changing its look?

Usually. Walls can be filled from the inside or under lifted siding, and patches are small.

Do I need city approval?

Interior insulation usually does not affect exterior appearance, but check with the city if your house is in a historic district.

How long does wall insulation take in an older house?

Typically one to three days depending on the number of walls and stories.

Free Estimates in Stillwater, MN

Free on-site estimates in Stillwater.

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Spray Foam Insulation Near Stillwater

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