Cambridge, Isanti County seat on the Rum River

Spray Foam Insulation in Cambridge, MN

A town with huge seasonal swings, where insulation has to work just as hard in July as in January.

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

Insulation for Both Ends of the Thermometer

Cambridge asks spray foam insulation to handle a remarkably wide range. The town's records run from a high of 109 F in July to a low of -42 F. Most insulation talk in central Minnesota focuses on winter, but a house in Cambridge also has to stay comfortable when an attic bakes in summer sun. A good air seal and plenty of insulation do both jobs.

Winter: keeping heat in

Cold-weather leaks follow a familiar pattern: warm air escapes through the attic floor at chases, lights and top plates, and cold air pours in at the basement rim joist. Closed-cell spray foam at the rim and blown-in depth over a sealed attic floor address both ends. The DOE recommends R60 for an uninsulated attic in its coldest zones.

Summer: keeping heat out

An attic in July can get far hotter than the outdoor air. When that heat radiates down into bedrooms, the AC runs hard. The same air sealing and insulation that stops winter heat loss slows summer heat gain. Where ductwork or HVAC equipment runs through the attic, open-cell foam on the roof deck can bring that space inside the insulated envelope.

The Rum River and basements

The Rum River runs north to south through the middle of Cambridge. Homes near it may have damp basements, so we check for moisture before insulating. Closed-cell foam is the only spray product we use below grade, since the DOE warns that open-cell can absorb water there.

A growing county seat

Cambridge, founded in 1866 and incorporated in 1877, grew from 9,611 people in 2020 to an estimated 10,509 in 2023. The 2020 census counted 3,988 housing units. Isanti County is in Minnesota's Zone II for frost, with footings at least 3-1/2 feet deep.

We visit, measure and write it all down. Get a free estimate or call (320) 433-6603.

Cambridge Facts

Temperature range. Cambridge's recorded temperatures run from a high of 109 F in July to a low of -42 F, under a warm-summer humid continental climate.
Rum River. The Rum River runs north to south through the middle of Cambridge, the county seat of Isanti County.
Growth. Cambridge counted 9,611 residents in the 2020 census and an estimated 10,509 in 2023, with 3,988 housing units in 2020.
Frost zone. Isanti County is in Zone II under Minnesota rule 1303.1600, requiring a minimum 3-1/2 foot frost footing depth.

Our Services in Cambridge, MN

Cambridge Questions

Does insulation help with summer heat in Cambridge too?

Yes. Air sealing and attic insulation slow heat moving into the house in summer just as they slow it moving out in winter.

My ducts run through the attic. What do you suggest?

One option is spraying open-cell foam under the roof deck, which brings the attic and ducts inside the insulated envelope. Another is sealing the ducts and burying them in blown insulation. We will explain both.

Can you insulate a basement near the Rum River?

After checking for moisture, yes. Closed-cell foam is the right product for basement walls and rim joists.

Do you work across Isanti County?

We serve Cambridge and the surrounding area. Call to confirm your address.

Free Estimates in Cambridge, MN

Whichever side of the Rum River you live on, Cambridge estimates are free.

Call (320) 433-6603 Free Estimate