Abstract: The joint thereshown has two stainless steel side plates (21, 22) which are rolled from a single strip and are bent double at the bottom of the lower limb (23) of the Y. The plates have rolled in ridges (24) at the top of this limb (23) and diverge above the ridges (24) as upper Y limbs (26). Between the limbs (26) a core is captivated at a relatively hard, necked lower core-portion or rib (31) by the ridges (24). Above these, a relatively softer upper core-portion or strip (32) fills the space between the upper limbs (26), tapering out with them. The core is a co-extrusion of the two portions (31, 32) joined by a neck (33). It is held in place by the ridges (24) being rolled around lower portion (31). This joint is fitted between tiles at a gap of the width of the ridges (24), by driving it between the tiles to compress the divergent upper Y limbs (26).

Abstract: A field limitation joint has a core (101) of closed cell synthetic elastomer and aluminum L-section side members (102). The core is adhered to the side members by double sided adhesive strip (103) of the type having reinforcing filaments (104) running along the length of the strip. The core is pre-compressed and held in compression by tapes (105, 106). These are fabric reinforced and incorporate a central strip (107) of polymer film rendering them non-adhesive along their center. Also they have perforations (108, 109) along their length at the edge of the strip (107). The adhesive edges (110) of the tape (105) are adhered to the outside of upright limbs (111) of the side members and pass over the top of the side members. The perforations (108) run along the top edge of the side members. The other tape (106) extends between the other limbs (112) of the side members on their undersides, again with the non-adhesive strip preventing adhesion to the core (101).