Primary recommendation
WR550 Weather-Resistant Silicone
Neutral-cure exterior silicone for compatible roof, facade, window-frame and movement-joint applications exposed to weather.
Sealant Application Guide
Roofing & Facade Joint Sealant Selection
Start by identifying what the joint must do. Use WR550 for compatible non-structural exterior weatherseals around facade panels, metal roof details, flashing, frames and masonry transitions. When the joint bonds glass to the frame and carries the designed structural load path, review SS-998 instead. Curtain wall systems still require the actual finishes, joint design and project documents to be checked before production.
Recommended Vesta products
Start with the product matched to the joint exposure, then confirm substrate compatibility and project requirements.
Alternative for specific conditions
SS-998 Neutral Structural Silicone
Choose SS-998 for the designed glass-to-frame structural bond. Its one-component format and reported adhesion and shear results give facade teams a clear starting point for project evaluation.
Where this application fits
Use the scene first to identify the joint, then check the substrate, exposure and movement below.
Facade and panel joints
Weather-exposed perimeters around coated panels, cladding and exterior movement joints.
Roof edges and flashing
Compatible metal roof details and flashing connections exposed to rain and temperature change.
Exterior material transitions
Frame-to-masonry and non-structural glass-to-metal connections that must shed water.
- Facade panel and perimeter weatherseals
- Metal roof edges and flashing details
- Glass-to-metal exterior transitions outside structural glazing
- Exterior frame-to-masonry joints
- Weather-exposed movement joints
- Glass-to-frame structural bonding in designed facade systems
Common substrates
- Glass and aluminum
- Coated metal and facade panels
- Concrete, brick and masonry
- Compatible roofing and flashing materials
- Dissimilar exterior materials after adhesion review
Key performance requirements
- UV, rain and weather resistance
- Movement capacity for thermal cycling
- Durable adhesion to prepared substrates
- Compatibility with coatings and adjacent materials
- Joint geometry suited to movement and water shedding
Product selection guidance
Choose by service condition
Choose by joint function. WR550 is the starting point for exterior weather protection and movement; SS-998 is the structural-bonding starting point when the designed glass-to-frame joint transfers load. Confirm the actual substrates, coatings, adjacent materials and joint design before specification.
Before Application
Application considerations
- Review the project joint design rather than selecting only by substrate name.
- Confirm movement range, bead dimensions and backing material.
- Test adhesion to coatings and factory-finished panels.
- Check that sealant placement supports, rather than traps, designed water flow.
Common Questions
Frequently asked questions
Is WR550 intended for exterior weather sealing?
Yes. WR550 is designed for compatible exterior joints exposed to UV, rain and movement, including facade, roofing-detail and frame-perimeter applications.
Which Vesta product fits structural glazing in a facade system?
SS-998 is the Vesta starting product for glass-to-frame structural bonding in properly designed facade and curtain-wall systems. Use the current TDS, actual-material testing, the approved joint calculation and written technical approval before production.
Can WR550 be specified for structural glazing?
No. WR550 is the weatherseal route for compatible non-structural exterior joints. Review SS-998 when the sealant forms the glass-to-frame structural bond, then complete the required project-specific evaluation.
Does every facade substrate need the same primer?
No. Primer and surface-preparation requirements vary with the substrate, coating and project conditions. Perform project-specific adhesion testing and follow the current technical data.
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