Blown-In Insulation in St. Cloud, MN

Blown-In Insulation in St. Cloud is often the workhorse of a project. Loose cellulose or fiberglass is fed through a hose and spread across an attic floor, or packed tight into closed wall cavities. It wraps around wiring, pipes and awkward framing in a way batts cannot, goes in quickly, and it costs far less per R-value than spray foam. On a typical open attic, sealed first and then blown to depth, it is the right answer more often than not.

Cellulose and fiberglass

Most of what goes into cellulose is recycled paper, with added fire and pest treatment. HomeGuide rates it around R-3.1 to R-3.8 per inch. Being heavier and denser than loose fiberglass helps it resist air movement a little and makes it the usual pick for dense-packing walls. Loose-fill fiberglass is lighter and lists at about R-2.2 to R-2.9 per inch, so it needs more depth for the same R-value. It does not absorb water the way cellulose can, and it settles less. Either one works on an attic floor. We explain the tradeoffs and let you choose if you have a preference.

Reaching R60 in the attic

The Department of Energy lists R60 for an uninsulated attic in zones 6 and 7, its coldest. At the R-values above, that takes well over a foot of loose fill, which is easy in most attics with standard trusses. Before blowing, we seal the attic floor, fit baffles along the eaves to keep the soffit vents clear, and build a dam around the hatch. Then we blow evenly to depth and set rulers so you can see the level later. Cellulose settles some after install, so we blow to a settled depth that still reaches the target.

Dense-pack for closed walls

Many older homes have empty or half-filled wall cavities behind plaster or drywall. Tearing out walls to spray foam is expensive. Dense-pack blown insulation goes in through small holes drilled in each stud bay, either from outside under a strip of siding or from inside, and is packed tight enough that it does not settle. It cuts drafts and heat loss through the walls, and the holes are plugged afterward. HomeGuide lists dense-pack cellulose at $1.60 to $4.20 per square foot.

Before we blow anything

Blown-in over a leaky attic floor saves less than it should and can make frost and ice dams harder to fix later, since the leaks are now buried. We check for:

• Gaps at top plates, light fixtures, plumbing and the flue
• Bathroom fans exhausting into the attic rather than outside
• Knob-and-tube wiring, which should not be buried under insulation until an electrician has looked at it
• Roof leaks, ice dam stains and rodent activity
• Vermiculite, which we leave alone until it is tested

When blown-in is not the right tool

Blown-in does not seal air on its own, and it does not belong on basement walls, rim joists, steel buildings or the underside of a roof deck. In those spots closed-cell foam is the better fit. Many of our quotes combine the two: foam in the spots that need an air seal and moisture control, blown-in wherever the goal is depth.

Mess and time

Blown-in work is usually done in a day for a typical attic. You do not need to leave the house, though there will be a hose running through a door or window. We cover the path, clean up and leave the hatch sealed and insulated.

Insulation contractors and what to compare

When you get quotes from insulation contractors for blown-in work, ask each one the same three questions: what settled depth will you install, what R-value does that reach, and what air sealing is included? A low price that skips sealing is not a bargain in this climate, because the attic will keep frosting and the ice dams will keep coming. Ask whether baffles and a hatch dam are included, and whether the bags or material weight are listed, since manufacturers publish coverage charts that tie bag counts to R-value. Our quote lists the material, the settled depth, the R-value and every sealing item, so you can hold any quote side by side with ours.

Attic access and hard-to-reach corners

Low-slope roofs, tight eaves and attics with only a closet hatch take longer to blow evenly, because the hose has to reach every corner and the installer has to crawl to the edges. We look at access on the first visit and plan the route. In attics with very low clearance at the eaves, a few inches of closed-cell foam at the edge reaches more R-value than loose fill can in that space, and it appears as a separate quote line, leaving the call on whether it is worth it to you.

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