Abstract: A sink form for use in installing a sink having laterally extending flanges in a countertop is preferably formed of a plastic material, such as nylon or polypropylene resin. It is preferably made to the exact shape of the cut-out opening for the sink, although for round or oval sinks, the form may consist of a flexible strip of the proper cross-section cut to length as required to match the opening. The sink form has a cross section consisting of a downwardly extending portion which is secured to the edges of the opening, a laterally extending flange portion, and, at the outer edge of the flange portion, an upstanding vertical portion terminating in an outwardly curved part. The downwardly extending portion is secured to the edge of the cut-out opening with the laterally extending flange portion spaced away from the countertop to allow for a layer of concrete float material between the flange portion and the countertop.

Abstract: A sink form for use in installing a sink having laterally extending flanges in a countertop is preferably formed of a plastic material, such as nylon or polypropylene resin. It is preferably made to the exact shape of the cut-out opening for the sink, although for round or oval sinks, the form may consist of a flexible strip of the proper cross-section cut to length as required to match the opening. The sink form has a cross section consisting of a downwardly extending portion which is secured to the edges of the opening, a laterally extending flange portion, and, at the outer edge of the flange portion, an upstanding vertical portion terminating in an outwardly curved part. The downwardly extending portion is secured to the edge of the cut-out opening with the laterally extending flange portion spaced away from the countertop to allow for a layer of concrete float material between the flange portion and the countertop.