Open-Cell Spray Foam
A lighter foam that expands to fill irregular cavities and rafter bays completely. Its open structure makes it exceptional at deadening sound, which is why it is often specified for interior walls and finished attic spaces.
Why homeowners choose it
- Expands to reach awkward gaps and rafter bays
- Softens sound between rooms and floors
- Specified where a full seal and a quiet home both matter
How we install it
In-home assessment
We inspect your attic, walls, or crawl space and find exactly where your home is leaking energy.
A clear, fair quote
You get a straightforward plan and price, the right material for each space, no upsell.
Clean, expert install
Our expert crew seals the envelope, protects your home throughout, and leaves it spotless.
Open-cell vs. closed-cell, side by side
| Open-cell | Closed-cell | |
|---|---|---|
| Feel when cured | Soft and flexible | Hard and rigid |
| On application | Expands a lot; fills irregular cavities and rafter bays | Expands less; lies in a thin, dense layer |
| R-value per inch | Lower | The highest we install |
| Moisture | Not for spaces with direct moisture | Resists water and vapor |
| Sound | Excellent at deadening sound | Some, but not its strength |
| Structure | Stays flexible | Adds rigidity to the framing |
| Cost per board foot | Lower | Higher |
| Best for | Interior walls, roof decks, finished attics | Crawl spaces, rim joists, tight rafters, below grade, metal buildings |
Questions homeowners ask
Where is open-cell foam the right choice?
Interior walls, roof decks and finished attics: anywhere sound control matters and moisture is not a direct concern. It expands to fill irregular cavities and rafter bays completely, and it costs less per board foot than closed-cell.
Does open-cell foam stop drafts as well as closed-cell?
Yes. Both foams form a continuous air seal. The difference is in what else they do: open-cell stays soft and quiets a room, while closed-cell cures hard, resists water and packs more R-value into a thin layer.
Why would one house get both foams?
Because the spaces differ. A roof deck wants open-cell for its expansion and sound control; a crawl space or rim joist wants closed-cell for its water resistance. Many of the homes we insulate get both, each where it belongs.
Where we do this
Based on Federal Road in Brookfield, working across western Connecticut and the New York border.
Best for
Interior walls, roof decks, sound control
Not sure if open-cell spray foam is right for your space? We'll assess your home and recommend the material that actually fits.
Request an estimateRelated services
Done properly the first time.
Request an estimate and we'll assess your home or building, specify the right material for each space, and give you a clear plan. On time, and spotless when we leave.