Willseal 150 | Tremco Pre-Compressed Foam Primary Seal for Vertical Joints
The Willseal 150 is a high-performance pre-compressed, self-expanding polyurethane foam joint seal designed for primary sealing in vertical construction joints. Engineered to deliver a permanent, flexible, and vapor-permeable barrier, this seal protects against driving rain up to 12 lb/ft² (600 Pa) while maintaining long-term elasticity and UV stability. Its optimized density and configuration provide enhanced R-value and acoustic properties, making it ideal for demanding building envelope applications.
Key Benefits of Willseal 150
- Primary weather-resistant seal for vertical expansion and control joints
- Protects against water penetration under extreme conditions up to 600 Pa
- Maintains UV stability and permanent flexibility for the life of the seal
- Enhances thermal and sound performance by increasing joint R-value
- Easy-to-install with optional PSA (pressure-sensitive adhesive) backing—no mixing, masking, or priming needed
- Available in multiple widths for custom project needs
- Compatible with Tremco’s full range of joint and façade sealing systems
Common Applications
Willseal 150 is ideal for vertical expansion and control joints, pre-cast masonry and façade assemblies, window starter tracks, EIFS systems, and interior assemblies requiring vapor, dust, or air control. Its balance of flexibility, weather resistance, and ease of use makes it suitable for both new construction and retrofit projects.
Packaging and Performance
Available in rolls and sticks, Willseal 150 simplifies field applications while delivering exceptional resistance to driving rain, thermal cycling, and environmental stressors.
Product Properties
| Property | Value |
|---|---|
| ASTM C518: Thermal Conductivity | 0.05 W/m°C |
| ASTM D3574: Ultimate Elongation | 120% ± 20% |
| Foam Color | Black |
| Storage Temperature | 68 °F (20 °C) |
| Temperature Stability | -40 to 212 °F (-40 to 100 °C) |
For a secondary backing solution compatible with wet sealants, see Willseal Backer Roll. More Tremco joint sealing systems are available at TremcoSealants.com.
