CURTAIN WALL JOINT

For curtain wall perimeter joints, Hilti CFS-SP WB Water-based acrylic sealant spray can be used in combination with compressed mineral wool safing. The product becomes rain-resistant after approximately 1 to 2 hours of curing and water-resistant once fully cured.

However, it should not be treated as the primary external waterproofing or façade weather seal. Where the firestop will remain permanently exposed to direct weathering or UV radiation, the exposure conditions and required protective detailing must be reviewed against the applicable tested system or a project-specific Hilti Engineering Judgment.