What joint is made of three materials and can only accommodate movement of 1/4 inch?

• A. Strip seal
• B. Pourable joint seal
• C. Cellular joint seal
• D. Compression joint seal

Answer: (B)

Pourable joint seal is designed for joints that don’t move much. It uses a three-material fill system: a backing material to set the depth, the pourable sealant itself to fill the joint and allow a bit of movement, and a surface seal or bonding layer to seal the top. Because this system relies on a flexible sealant that cures in place, its movement capacity is limited—about 1/4 inch. It’s intended for small, restrained movements, not large gaps. Other joint types, like strip seals, cellular joints, or compression seals, are built to handle larger displacements with different materials and configurations, which is why they’re chosen when more movement is expected.