Watertight Expansion Joints and Construction Sealants by EMSEAL


A blockout is a recess at a joint gap edge to accept different types of expansion joint profiles. Also referred to by regional terminology such as knockout, cutout, and others.

Expansion joint blockout

NOTE: The definitions of terms and terminology herein are rooted in the context of use in the field of construction-related joint sealing in EMSEAL’s experience. They are provided with the intent of offering a fuller understanding of the context of their usage. Any suggestions or questions regarding interpretation are welcome and should be directed to content@emseal.com. Thank you.