Elastomeric sectional strip for expansion joints

An elastomeric sectional strip for sealing an expansion joint on a building, each edge of which is thickened for engagement in one of a pair of grooves bordering the joint, characterized in that seen in cross-section, in the installed position, each thickened edge region is supported at three points with respect to walls of the groove, said three-point support being defined by:

• (a) a bulge on an upper side of said edge region, said bulge being located inside said groove adjacent its opening;
• (b) a shoulder projecting in the form of a wedge into said groove in the opposite direction to the insertion direction on the underside of said edge region, said shoulder being supported against a corresponding stop face of said groove;
• and
• (c) a camber on said upper side of said edge region on or close to its outer end, each of said grooves having a hollow cross-section complementary to the cross-sectional shape of said thickened edge region, excepting for the upper camber of the sectional strip, the height of each groove in the inlet region being less than the thickness of said section, measured through the lower shoulder.