Abstract: An expansion joint control system wherein a blockout is formed between structural members such as a floor or wall and a gap allowing for expansion and contraction is defined between the structural members. The blockout defines opposed vertical faces and inwardly extending transverse surfaces with a flexible membrane spanning the distance between vertical faces. A slide plate is attached beneath the center of the membrane. Base members are positioned on the transverse surfaces for supporting the sides of the membrane and are in sliding contact with the slide plate. The slide plate and base members are formed of polymeric materials preferably having thermal expansion characteristics similar to concrete. The system elements occupy a blockout having a depth of one inch or less. The polymeric material can be readily bent on site making the system particularly useful for stadiums, etc. which have continuously changing elevations.

Abstract: An improved expansion-joint cover assembly of the type having a first base member secured to a first structural section and a second base member secured to a second structural section and a flexible-spring cover member coupled between said base members and overlying the open joint. The improvement comprising an interchangeable trim strip portion removably secured to the end of a first wall defining a passageway in said second base to receive the free end of said cover member and an interchangeable spring support removably secured to the end of the second wall defining such passageway. The spring support includes a support tip which engages the cover member and forces it into intimate contact with the trim strip supporting such cover member and holding it in its closed position.