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Tremco Willseal 600
Tremco Willseal 600 is a pre-compressed vapor-permeable foam seal for vertical joints, in 1/8 in to 2 in rolls and 2.25 in to 8 in sticks. It is used on masonry, precast, EIFS, and window-wall starter track.
- Weather-tight primary seal on vertical facades
- Pressure-sensitive adhesive on one face
- Greenguard Gold for sensitive interiors
Willseal 600 - Vertical Breathable Seal
Tremco Willseal 600 is a pre-compressed, self-expanding polyurethane foam joint seal impregnated with a flame-retardant acrylic resin and treated with pressure-sensitive adhesive on one face. It is used as a weather-tight, vapor-permeable primary seal on vertical joints in precast, masonry, EIFS, metal panels, and window-wall starter track. Greenguard Gold listing and Class A flame and smoke ratings make it a fit for facades and sensitive interiors.
Key Features
- Pre-compressed acrylic-impregnated polyurethane foam
- Vapor-permeable, weather-tight primary seal
- Pressure-sensitive adhesive on one face
- Class A flame spread 5 / smoke 5, ASTM E84
- Greenguard Gold
Applications
- Precast, masonry, brick, and facade joints.
- EIFS and insulated metal panels.
- Window-wall starter track.
- Interior vapor, dust, and air control.
- Secondary construction joints behind a wet seal.
Technical Specifications
| Property | Value |
|---|---|
| Flame spread | 5, ASTM E84 Class A |
| Smoke development | 5, ASTM E84 Class A |
| Thermal resistance | 3.3 to 3.6 hr·°F·ft²/Btu, ASTM C518 |
| Thermal conductivity | 0.28 to 0.30 Btu·in/hr·°F·ft², ASTM C518 |
| Tensile | 21 psi min, ASTM D3574 |
| Foam elongation | 120% ± 20%, ASTM D3574 |
| Compression set | 4.2% max, ASTM D3574 |
| Driving rain | 600 Pa (12 psf) |
| Joint sizes | Rolls 1/8 in to 2 in; sticks 2.25 in to 8 in, 6.5 ft |
| Temperature stability | Short term −40 to 248°F; long term −40 to 194°F |
Documents
Willseal 600 Technical Data Sheet
Frequently Asked Questions
What vertical joints is Tremco Willseal 600 used on?
Precast, masonry, brick, facades, EIFS, insulated metal panels, and window-wall starter track.
What is the vapor permeability of Tremco Willseal 600?
It is a vapor-permeable, weather-tight primary seal on vertical joints.
What is the flame spread of Tremco Willseal 600?
5, ASTM E84 Class A.
What is the smoke development of Tremco Willseal 600?
5, ASTM E84 Class A.
What is the standing-water use of Tremco Willseal 600?
It is not a primary seal where standing or ponding water will occur, and it is not used below grade.
What is the thermal resistance of Tremco Willseal 600?
3.3 to 3.6 hr·°F·ft²/Btu, ASTM C518.
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