Ensure a weather tight seal with JBC, a self-adhering, flexible foam sealant which expands to fill contours and gaps. Use JBC to seal out dust, air, wind-driven snow and moisture through joining details in metal building roofs. Suitable for use against metal, plastic, wood, concrete and other common metal building structures. The JBC’s expanding sealant is UV-stable and will not dry out and become hard and brittle. The Expanding Foam Sealant maintains a seal during the thermal expansion and contraction of building panels. The sealant has a self-adhesive on one side. After the removal of the packaging, the material begins to gradually expand. Durable and versatile solution for difficult-to-seal areas.