A method for undermounting a sink to a countertop includes preparing a countertop and a sink. Thereafter a primary channel is routed within the backside of the countertop, the primary channel including a base and being shaped and dimensioned for receipt of the sink flange, and a secondary channel is routed within the base of the primary channel along an interior circumference of the primary channel. Substrate material is then removed from the secondary channel to expose an underside of the decorative laminate and adhesive is applied within the secondary channel so that the underside of the decorative laminate is fully covered. A bead of adhesive is applied to the base of the primary channel and the sink flange is placed within the primary channel. A support plate is secured around the sink flange to provide support and a central portion of the countertop defined by the primary channel is cut out to expose the bowl of the sink.