ExoAir LEF
Low-Expansion Joint Insulation Foam
ExoAir LEF is a one-component, moisture-curing, low-expansion polyurethane foam developed to insulate around window and door openings, pipes, joints, and penetrations. With a closed-cell structure, ExoAir LEF delivers long-term thermal resistance and seals out air, water, and noise. Its controlled expansion ensures tight fills without over-compressing adjacent materials. It is ideal for use in conjunction with air barrier systems and can be trimmed and painted after application.
Key Benefits of ExoAir LEF
- Precision Application: Low-pressure expansion prevents warping and overfilling.
- Thermal & Acoustic Insulation: Closed-cell structure provides high R-value and sound control.
- Fast Cure: Skins over quickly, allowing trimming in minutes and painting after full cure.
- Durable Seal: Bonds to a variety of substrates and maintains flexibility with minimal shrinkage.
Common Applications
- Window and door frame insulation
- Joint and gap filling around penetrations
- Sealing of base plates and transitions
- Complementing air barrier and waterproofing systems
Packaging & Installation
ExoAir LEF is dispensed via canister with an application nozzle or gun for accurate placement. Ideal for commercial and residential construction, it is compatible with other Tremco air barrier products. Cures quickly and can be trimmed and painted for a clean finish.
Product Properties
| Property | Value |
|---|---|
| Application Method | Aerosol can or gun foam dispenser |
| Application Temperature | 40 to 95 °F (4 to 35 °C) |
| Thermal Resistance (R-Value) | 3.7 R/in |
| Expansion Type | Low expansion (controlled) |
| Technology | Polyurethane foam |
Also see ExoAir Flex Foam for dynamic joint sealing. Learn more at Tremco Sealants.
