Abstract: A system for forming a smooth, rounded inner corner joint between two adjacent perpendicular wall sections in a coved backsplash. The first wall section comprises a substantially rectangular member, the bottom surface thereof having a toe shaped protrusion, the sides of the protrusion extending at an angle to the longitudinal axis of the member. The second wall portion comprises a longitudinally extending wall portion comprising first and second steps, a curved lower portion of the second step extending outwardly from said first portion. A toe shaped protrusion being formed at the bottom of the second wall portion. A third right angled corner member has a first elongated surface which abuts against one edge of said first rectangular member and a second elongated thin edge portion which abuts against the riser portion between the first and second steps of the second wall portion, a toe shaped protrusion being at the bottom of the corner member.