Princeton, on the Rum River

Spray Foam Insulation in Princeton, MN

A Rum River town where most homes fall in Mille Lacs County's 5-foot frost zone and a few sit in Sherburne's 3-1/2.

Free on-site estimates
Written quote showing the material, thickness and target R-value area by area
Foundation walls checked for moisture before any foam goes on

One City, Two Sets of State Rules

Princeton adds an unusual wrinkle to spray foam insulation. The city lies in both Mille Lacs and Sherburne counties, with most residents on the Mille Lacs side, and Minnesota's building rules treat those two counties differently. Mille Lacs County is in the state's Zone I for frost, where footings must be at least 5 feet deep, and on the list of counties with a 60 pound per square foot ground snow load. Sherburne County is in Zone II at 3-1/2 feet and uses 50 psf.

Why the frost line matters for insulation

A deeper frost line is a sign of colder ground. Foundation walls on the Mille Lacs side sit in frozen soil to a greater depth, and the top of the wall and the rim joist above it lose a lot of heat. Closed-cell spray foam on those areas is one of the most effective upgrades in a Princeton basement.

Heavier snow, more ice dam risk

A roof designed for 60 psf ground snow is a roof that sees serious snow. When attic heat leaks up into that snowpack, ice dams form along the eaves. Air sealing the attic floor first, then building depth, keeps the roof deck cold.

Brick history

About two miles northeast of town, Brickton was the center of a brick industry that ran from 1889 through the late 1920s and produced as many as 20 million bricks a year. Some older Princeton homes and buildings may use local brick. Solid masonry walls behave differently from framed ones; we look carefully before insulating them.

On the Rum River

Princeton sits where the West Branch joins the Rum River. Homes near the water can have damp basements, so we check for moisture before spraying. Closed-cell foam resists moisture below grade; open-cell does not belong there.

Platted in 1855 and incorporated in 1877, the city counted 2,190 housing units in 2020. Get a free estimate or call (320) 433-6603.

Princeton Details

Two counties. Princeton lies in Mille Lacs and Sherburne counties, with most residents in Mille Lacs County.
Frost rules. Minnesota rule 1303.1600 puts Mille Lacs County in Zone I (5-foot minimum frost footing) and Sherburne County in Zone II (3-1/2 feet).
Snow load. Mille Lacs County is one of 29 counties with a 60 psf ground snow load under Minnesota rule 1303.1700; Sherburne uses 50 psf.
Brickton. Brickyards at Brickton, about two miles northeast of Princeton, operated from 1889 through the late 1920s and produced up to 20 million bricks a year.

Our Services in Princeton, MN

Princeton Questions

Which county is my Princeton house in, and does it matter?

For permitted work, yes. Mille Lacs County uses a 5-foot frost footing depth and a 60 psf snow load under state rules, while Sherburne uses 3-1/2 feet and 50 psf. For insulation, both mean cold foundations and heavy snow.

Can you insulate an older brick house?

Solid brick walls need care, because insulating them changes how they dry. We usually focus on the attic, basement and rim joist and discuss wall options case by case.

Why does my Princeton roof get ice dams every year?

Attic heat is warming the roof under the snow. Sealing the attic floor and adding insulation keeps the roof cold.

Do homes near the Rum River need special basement insulation?

They need a moisture check first. If the walls are dry, closed-cell foam is the right material.

Free Estimates in Princeton, MN

Mille Lacs side or Sherburne side, Princeton estimates cost you nothing.

Call (320) 433-6603 Free Estimate