Building Envelope Solutions
Wall insulation without demolition
Many older houses were built with empty wall cavities. We insulate them from outside or inside: one small hole per stud bay, dense-pack cellulose blown in under pressure until the cavity is full, then the hole is plugged and patched.
Many older Long Island capes, colonials and ranches were built with empty or thinly filled walls.
Where it works
- Frame houses with siding: we drill from outside under a lifted course.
- Plaster walls inside: we drill from inside and patch.
- Rooms over garages: walls and floors that face the cold garage.
How a job goes
- We check the walls for wiring, blocking and old insulation, and pick the side to drill from.
- We drill, fill each bay and check that it is full.
- We plug and patch the holes and clean up.
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
Will you damage my siding? On vinyl or wood siding we lift a course, drill and put it back. On brick we usually drill from inside.
How long does it take? Most homes take one or two days.