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
Facade work can contain two different sealant roles: WR550 for compatible non-structural exterior weatherseals, and SS-998 for structural bonding in properly designed systems after actual-material testing and project approval. Identify the joint function before choosing a product; a weatherseal and a structural silicone are not interchangeable.
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
Structural bonding and sealing in properly designed facade systems after actual-material adhesion, compatibility and project-design review.
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 joints
- Structural glazing and approved facade bonding systems
- Metal roof edges and flashing details
- Glass-to-metal exterior transitions outside structural glazing
- Exterior frame-to-masonry joints
- Weather-exposed movement joints
- Compatible cladding and coated-panel perimeters
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 for exterior weatherseals
- Movement capacity for thermal cycling
- Structural bonding only within an approved system
- Actual-material adhesion and compatibility evidence
- Joint geometry and load path matched to the intended function
- Compatibility with coatings and adjacent materials
Product selection guidance
Choose by service condition
Start with the joint function. Use WR550 for compatible non-structural exterior weatherseals; review SS-998 only where structural bonding is part of the approved system and actual-material testing, joint design and written technical approval are available.
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 the Vesta product path for compatible exterior joints exposed to UV, rain and movement, including facade, roofing-detail and frame-perimeter applications.
Can WR550 be specified for structural glazing?
Structural-glazing suitability is not claimed on this page. Request the relevant technical and test documentation and obtain written confirmation before any structural use.
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.
Continue Exploring
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