Building Envelope Solutions
Attic insulation on Long Island
The attic is where most Long Island homes lose the most heat in winter and gain the most in summer. Many attics have old, thin insulation and open gaps around every pipe, wire and light.
Two ways to do it
- Attic you don’t use: we air seal the attic floor, then add blown-in insulation to the depth it needs.
- Attic you use or plan to finish: spray foam under the roof deck keeps it close to room temperature.
Capes, colonials and ranches
- Capes: knee walls, short side attics and finished upstairs rooms are often under-insulated. We seal and insulate each space.
- Ranches and high ranches: long, open attics are well suited to air sealing plus blown-in.
- Ice dams: warm air leaking into the attic melts snow on the roof. Sealing the attic floor helps stop it.
Rebates
On Long Island, gas is mostly National Grid and electric is PSEG Long Island. Depending on your home and what is funded this year, that can open National Grid, PSEG Long Island or NYSERDA programs. For 2027, Con Edison and National Grid plan one joint weatherization program for market-rate homes and apartment buildings. We check what is open for your address before we price the job. See the rebate guide.
Common questions
How long does it take? Most Long Island attics take one day.