Abstract: A mattress border assembly and method for preparing foam rails for shipment prior to assembly to form a mattress border assembly are disclosed. Strips of double-faced, high strength acrylic adhesive tape are applied to at least portions of the end walls of two foam rails. The second adhesive surface of the tape is covered with a protective liner until the border is to be assembled. When assembled, the end walls of the two foam rails are adhered with the tape to side walls of two other foam rails to form a generally rectangular frame structure that comprises the mattress border assembly. Optionally, additional strips of double-faced, high strength acrylic adhesive tape are applied to portions of the top walls and portions of the bottom walls of the foam rails so that additional mattress components may be adhered thereto.