cured epoxy described herein will have excellent adherence to concrete or cementitious surfaces and little adherence to the pvc in one preferred embodiment of the invention shown in fig1 and 2 consequently when and if the joint opens under shrinkage or temperature movement the joint will open along the line of the rigid pvc strip leaving an epoxy nosing on each concrete edge providing support and wear resistance when required if the joint is subject to any compressive forces the strength of the epoxy is such as to distribute any likely forces through the cementitious slab in the manner that mortar joints have in the past the shape of the joint member 1 shown in fig1 and 2 enables the fixing of epoxy nosings of sufficient depth on the edges of slab joints to minimize damage from traffic over the joint it is possible to provide joint members suitable for various saw cut widths and the particular construction shown in the drawings copes with variation of width in a single saw cut the construction will seal the slot channel or groove to retain the fluid epoxy without substantial slumping and the stabilizing parts of the construction provide a self centering or easily centered construction so that the upper divider 5 is substantially symmetrical the flexible sealing members 6 and 7 also play a role in these parts in the preferred embodiment of fig3 and 4 a joint member 1 and resultant joint is provided which is particularly designed for use in food preparation areas in this preferred form of the invention no exposed gap can form at.