Benefits
- Expands into irregular cavities
- Can help reduce air movement through the assembly
- Useful for interior and appropriate exterior assemblies
- Creates continuous coverage when installed correctly
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Open-Cell Spray Foam
A lower-density spray polyurethane foam that expands to fill interior cavities, rooflines, and appropriate exterior wall assemblies with continuous coverage.
What it is
Understanding Open-Cell Spray Foam
Open-cell spray foam is a lower-density spray polyurethane foam with an open cellular structure. It expands after application to fill many gaps and irregular cavities, creating a continuous insulation layer within the assembly. Its flexibility makes it a practical choice for complex framing layouts where a close fit is important.
How It Works
The foam is applied as a liquid that expands and cures in place, conforming around wiring, pipes, and irregular framing. Its insulation and air-sealing characteristics depend on installed thickness, the building assembly, and professional installation. The complete wall or roof assembly determines whether open-cell foam is appropriate for a specific interior or exterior application.
Common applications
- Interior wall cavities
- Interior ceilings and rooflines
- Exterior wall assemblies
- Roofline and attic assemblies
- New construction
- Remodeling and additions
- Hard-to-fit framing areas
- Residential projects
Recent project work
Open-Cell Spray Foam in Progress
A look at open-cell spray foam installed across residential rooms, garages, and building spaces.
Energy-efficiency considerations
Open-cell foam can be part of an efficient building-envelope strategy, but the results depend on thickness, the surrounding assembly, air-sealing details, and the property’s overall design.
Installation considerations
Application requires trained installers, appropriate preparation, and correct thickness. The project should be evaluated for ventilation, building-code requirements, and the conditions of the specific assembly.
Important considerations
Plan Around the Full Building Assembly
Open-cell foam is vapor permeable, so moisture control should be considered in the context of the full assembly.
It is not automatically the right choice for every application; the location and project conditions matter.
Coverage and thickness should be verified as part of quality installation.
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Questions, Answered Straight
It is a lower-density spray polyurethane foam with an open cellular structure that expands into the cavity after application.