273+ Five-Star Reviews

Blown-In Insulation for NJ Attics

When batts do not fit the space, blown-in fills every gap. Financing available.

(732) 351-2005

Serving NJ, NY & PA|Free inspection|Financing available

Blown-in insulation being installed in a New Jersey attic

273+ Five-Star ReviewsLicensed & Insured | NJ HIC #13VH12785800Written scope before work starts

When blown-in is the right call

Fiberglass batts are our go-to for most full replacements. But some attics need a different approach.

Irregular joist spacing

Older NJ homes often have non-standard joist widths. Batts need cutting and fitting. Blown-in fills every gap without leaving exposed strips.

Obstructions and tight spots

Pipes, wiring, junction boxes, HVAC runs. Blown-in flows around them. Batts get compressed against them, which kills R-value.

Top-ups over existing insulation

Your current insulation is clean but thin. Instead of ripping it out, we blow fresh material on top to hit the R-value your attic needs.

Hard-to-reach areas

Low eaves, cathedral sections, spots where a person can not crawl. A 3-inch hose can reach where hands can not.

Blown-in insulation filling around joists and wiring in an attic

How we install blown-in insulation

Assess the attic and calculate depth.

We measure square footage, check existing insulation condition, and calculate the blown-in depth needed to hit your target R-value. Everything goes in the written scope.

Prep baffles and seal air leaks.

Baffles keep soffit vents clear so your attic breathes properly. We seal gaps around pipes, wires, and can lights before insulating. Air sealing is where most of your comfort comes from.

Blow to a consistent, verified depth.

Fiberglass or cellulose, depending on your attic. We blow to an even depth across the entire floor, not just the easy-to-reach center. Depth rulers go in so you can see the coverage.

Final check and cleanup.

We verify depth at multiple points, confirm baffles are clear, and clean up. You get a scope showing what was installed and where.

Full cost in writing before we start.

Material type, depth target, square footage, total price. You see the scope before we bring the machine.

Finished blown-in insulation covering an attic floor evenly

Blown-in vs. batt insulation

We use both. The attic decides which one.

Blown-in

Batt

Best for

Irregular spaces, top-ups, around obstructions

Open joist bays with standard spacing

Installation

Machine-blown through a hose, fills gaps automatically

Cut and fitted by hand between joists

Settling

Fiberglass: minimal. Cellulose: settles 10-15% over time

Does not settle, but can sag if poorly fitted

When AF uses it

When the attic calls for it

Primary material for most full replacements

Looking for batt insulation details? Read our fiberglass batt page

Common questions about blown-in insulation

What's better, blown-in or batts?

Neither is universally better. Batts work great in open, standard-width joist bays. Blown-in wins in tight spaces, around obstructions, and for top-ups. We recommend based on what your attic actually needs.

How deep should blown-in insulation be?

For NJ attics, you want R-49 minimum. That is roughly 16-18 inches of blown fiberglass or 13-14 inches of cellulose. We measure and verify depth with rulers after installation.

Does blown-in settle over time?

Blown fiberglass barely settles at all. Cellulose can settle 10-15%, which is why we account for it and blow to a higher initial depth. Either way, we install depth markers so you can check it yourself.

Do you use fiberglass or cellulose?

Both. Fiberglass is lighter and does not absorb moisture. Cellulose is denser and fills gaps aggressively. We pick the material based on your attic conditions, not a default preference.

Not sure which type you need?

That is what the inspection is for. Free, no obligation.