Long Island Fiberglass / Rockwool Insulation
Batt insulation for walls, attics, and cavities. The reliable choice when spray foam isn't the right fit for your assembly.
What is Fiberglass/Rockwool Insulation?
Dependable fiberglass and dense mineral wool batt insulation for Nassau and Suffolk counties. We install perfectly friction-fit, code-compliant thermal and acoustic coverage for walls, floors, and sound-dampening assemblies.
What we install
Brands of fiberglass and mineral wool we use
The batt on a job follows the cavity and the spec, not every wall gets every brand. These are the lines we stock and install.
Fiberglass batts
Owens Corning
PINK / EcoTouch
Faced and unfaced batts for exterior walls, floors, and attic cavities
Johns Manville
Fiberglass batts
Standard open cavities where a code-compliant batt is the right fit
Knauf
Fiberglass batts
Wall and floor cavities matched to framing depth and R-value
Mineral wool
ROCKWOOL
Comfortbatt
Thermal cavities in walls and floors that call for denser mineral wool
ROCKWOOL
Safe'n'Sound
Interior sound walls between bedrooms, offices, and multi-family units
Product types
Fiberglass, mineral wool, faced, and unfaced
Four choices that decide how the cavity performs: material, facing, and the R-value New York code expects.
Long Island R-values
- 3.5" R-13
- 2×4 walls
- 5.5" R-19
- 2×6 walls
- 10"+ R-30+
- Long Island attics
Fiberglass batts
The workhorse for standard open cavities. Cost-effective R-value in walls, floors, and attic spaces with conventional framing.
Mineral wool
A denser batt when the assembly needs stronger sound control or higher performance in the same cavity depth. ROCKWOOL is the line we install.
Kraft-faced
A kraft paper vapor retarder on the batt. Used on exterior walls and floors over unconditioned space, with the facing toward the conditioned side.
Unfaced
No facing attached. Used in interior walls, sound assemblies, and anywhere a separate vapor retarder is already in the stack.
Where it goes
Walls, floors, attics, and sound assemblies
Batt insulation fits open cavities across the house: thermal walls and floors, attic floors when batts are specified, and partitions built for quiet.
Wall cavities
We friction-fit faced or unfaced batts between studs in exterior and interior walls, custom-cutting precisely around electrical boxes, wiring, and plumbing to eliminate thermal bypass.
Floors over unconditioned space
Batts under floors above garages, crawl spaces, and other cold zones so heat stays in the living space above.
Attic floors (When Specified)
When your blueprint or building plans call for batts instead of loose-fill blow-in insulation, we install continuous, High-R-value coverage directly across the attic floor deck.
Interior Sound Assemblies
We install dense mineral wool or specialized fiberglass in partition walls between bedrooms, home theaters, home offices, and multi-family units to significantly cut sound transfer through the drywall.
Local crews
Batt crews Long Island already calls.
KC Insulation is a family company out of Central Islip. The same crews install fiberglass and mineral wool batts for homeowners and for general contractors who need cavities filled clean and tight on schedule.
- 2003
- Family owned on Long Island since
- Nassau & Suffolk
- Homeowners and general contractors
- 13+
- Years of experience
Service area
Batt insulation across Nassau and Suffolk
Our teams serve Nassau and Suffolk counties, from the South Shore to Smithtown, Brookhaven, and the East End.
Nassau and Suffolk counties
- Central IslipHome base
- HuntingtonSuffolk
- Bay ShoreSuffolk
- SmithtownSuffolk
- BabylonSuffolk
- HempsteadNassau
- PatchogueSuffolk
- RiverheadSuffolk
- SouthamptonEast End
- East HamptonEast End
More Services
Explore our other services
From insulation to waterproofing, KC Insulation Corp handles every phase with the same disciplined standard.
FAQ
Common questions about fiberglass and rockwool.
Fiberglass and mineral wool work best in open cavities with standard framing. That includes walls, floors, and attic spaces where you need a code-compliant R-value. They are also a strong choice for sound control between bedrooms, home offices, and multi-family units.
Don't wait! Get a free estimate. Secure your spot today.
We want to make the process as easy as possible for you. Contact us today to get a free estimate.