The expansion joint is not really created to support installation misalignment, Except clearly specified as being a layout need. a. Expansion joint rubber flanges must be in contact with a flat surface. Typical 1/16″ raised encounter is OK. Unacceptable depressions or protrusions are standard of victaulic or comparable flanges. Linkedin https://zionbwqjb.blogunteer.com/38003272/the-5-second-trick-for-bellows-expansion-joint